Harnessing the power of machine learning and artificial intelligence has enabled Windows Defender Advanced Threat Protection (Windows Defender ATP) next-generation protection to stop new malware attacks before they can get started – often within milliseconds. These predictive technologies are central to scaling protection and delivering effective threat prevention in the face of unrelenting attacker activity.
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Consider this: On a recent typical day, 2.6 million people encountered newly discovered malware in 232 different countries (Figure 1). These attacks were comprised of 1.7 million distinct, first-seen malware and 60% of these campaigns were finished within the hour.
Figure 1. A single day of malware attacks: 2.6M people from 232 countries encountering malware
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While intelligent, cloud-based approaches represent a sea change in the fight against malware, attackers are not sitting idly by and letting advanced ML and AI systems eat their Bitcoin-funded lunch. If they can find a way to defeat machine learning models at the heart of next-gen AV solutions, even for a moment, they’ll gain the breathing room to launch a successful campaign.
Today at Black Hat USA 2018, in our talk Protecting the Protector: Hardening Machine Learning Defenses Against Adversarial Attacks [PDF], we presented a series of lessons learned from our experience investigating attackers attempting to defeat our ML and AI protections. We share these lessons in this blog post; we use a case study to demonstrate how these same lessons have hardened Microsoft’s defensive solutions in the real world. We hope these lessons will help provide defensive strategies on deploying ML in the fight against emerging threats.
Lesson: Use a multi-layered approach
In our layered ML approach, defeating one layer does not mean evading detection, as there are still opportunities to detect the attack at the next layer, albeit with an increase in time to detect. Ab 60 drivers license update ca. To prevent detection of first-seen malware, an attacker would need to find a way to defeat each of the first three layers in our ML-based protection stack.
Figure 2. Layered ML protection
Even if the first three layers were circumvented, leading to “patient zero” being infected by the malware, the next layers can still uncover the threat and start protecting other users as soon as these layers reach a malware verdict.
Lesson: Leverage the power of the cloud
ML models trained on the backend and shipped to the client are the first (and fastest) layer in our ML-based stack. They come with some drawbacks, not least of which is that an attacker can take the model and apply pressure until it gives up its secrets. This is a very old trick in the malware author’s playbook: iteratively tweak prospective threats and keep scanning it until it’s no longer detected, then unleash it.
Figure 3. Client vs. cloud models
With models hosted in the cloud, it becomes more challenging to brute-force the model. Because the only way to understand what the models may be doing is to keep sending requests to the cloud protection system, such attempts to game the system are “out in the open” and can be detected and mitigated in the cloud.
Lesson: Use a diverse set of models
In addition to having multiple layers of ML-based protection, within each layer we run numerous individual ML models trained to recognize new and emerging threats. Each model has its own focus, or “area of expertise.” Some may focus on a specific file type (for example, PE files, VBA macros, JavaScript, etc.) while others may focus on attributes of a potential threat (for example, behavioral signals, fuzzy hash/distance to known malware, etc.). Different models use different ML algorithms and train on their own unique set of features.
Figure 4. Diversity of machine learning models
Each stand-alone model gives its own independent verdict about the likelihood that a potential threat is malware. The diversity, in addition to providing a robust and multi-faceted look at potential threats, offers stronger protection against attackers finding some underlying weakness in any single algorithm or feature set.
Lesson: Use stacked ensemble models
Another effective approach we’ve found to add resilience against adversarial attacks is to use ensemble models. While individual models provide a prediction scoped to a particular area of expertise, we can treat those individual predictions as features to additional “ensemble” machine learning models, combining the results from our diverse set of “base classifiers” to create even stronger predictions that are more resilient to attacks.
In particular, we’ve found that logistic stacking, where we include the individual probability scores from each “base classifier” in the ensemble feature set provides increased effectiveness of malware prediction.
Figure 5. Ensemble machine learning model with individual model probabilities as feature inputs
As discussed in detail in our Black Hat talk, experimental verification and real-world performance shows this approach helps us resist adversarial attacks. In June, the ensemble models represented nearly 12% of our total malware blocks from cloud protection, which translates into tens of thousands of computers protected by these new models every day.
Figure 6. Blocks by ensemble models vs. other cloud blocks
Case study: Ensemble models vs. regional banking Trojan
“The idea of ensemble learning is to build a prediction model by combining the strengths of a collection of simpler base models.”
— Trevor Hastie, Robert Tibshirani, Jerome Friedman
One of the key advantages of ensemble models is the ability to make high-fidelity prediction from a series of lower-fidelity inputs. This can sometimes seem a little spooky and counter-intuitive to researchers, but use cases we’ve studied show this approach can catch malware that singular models cannot. That’s what happened in early June when a new banking trojan (detected by Windows Defender ATP as TrojanDownloader:VBS/Bancos) targeting users in Brazil was unleashed.
The attack
The attack started with spam e-mail sent to users in Brazil, directing them to download an important document with a name like “Doc062108.zip” inside of which was a “document” that is really a highly obfuscated .vbs script.
Figure 7. Initial infection chain
Figure 8. Obfuscated malicious .vbs script
While the script contains several Base64-encoded Brazilian poems, its true purpose is to:
- Check to make sure it’s running on a machine in Brazil
- Check with its command-and-control server to see if the computer has already been infected
- Download other malicious components, including a Google Chrome extension
- Modify the shortcut to Google Chrome to run a different malicious .vbs file
Now whenever the user launches Chrome, this new .vbs malware instead runs.
Figure 9. Modified shortcut to Google Chrome
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This new .vbs file runs a .bat file that:
- Kills any running instances of Google Chrome
- Copies the malicious Chrome extension into %UserProfile%Chrome
- Launches Google Chrome with the “—load-extension=” parameter pointing to the malicious extension
Figure 10. Malicious .bat file that loads the malicious Chrome extension
With the .bat file’s work done, the user’s Chrome instance is now running the malicious extension.
Figure 11. The installed Chrome extension
The extension itself runs malicious JavaScript (.js) files on every web page visited.
Figure 12. Inside the malicious Chrome extension
The .js files are highly obfuscated to avoid detection:
Figure 13. Obfuscated .js file
Decoding the hex at the start of the script, we can start to see some clues that this is a banking trojan:
Figure 14. Clues in script show its true intention
The .js files detect whether the website visited is a Brazilian banking site. If it is, the POST to the site is intercepted and sent to the attacker’s C&C to gather the user’s login credentials, credit card info, and other info before being passed on to the actual banking site. This activity is happening behind the scenes; to the user, they’re just going about their normal routine with their bank.
Ensemble models and the malicious JavaScript
As the attack got under way, our cloud protection service received thousands of queries about the malicious .js files, triggered by a client-side ML model that considered these files suspicious. The files were highly polymorphic, with every potential victim receiving a unique, slightly altered version of the threat:
Figure 15. Polymorphic malware
The interesting part of the story are these malicious JavaScript files. How did our ML models perform detecting these highly obfuscated scripts as malware? Let’s look at one of instances. At the time of the query, we received metadata about the file. Here’s a snippet:
| Report time | 2018-06-14 01:16:03Z |
| SHA-256 | 1f47ec030da1b7943840661e32d0cb7a59d822e400063cd17dc5afa302ab6a52 |
| Client file type model | SUSPICIOUS |
| File name | vNSAml.js |
| File size | 28074 |
| Extension | .js |
| Is PE file | FALSE |
| File age | 0 |
| File prevalence | 0 |
| Path | C:Users<user>Chrome1.9.6vNSAml.js |
| Process name | xcopy.exe |
Figure 16 – File metadata sent during query to cloud protection service
Based on the process name, this query was sent when the .bat file copied the .js files into the %UserProfile%Chrome directory.
Individual metadata-based classifiers evaluated the metadata and provided their probability scores. Ensemble models then used these probabilities, along with other features, to reach their own probability scores:
| Model | Probability that file is malware |
|---|---|
| Fuzzy hash 1 | 0.01 |
| Fuzzy hash 2 | 0.06 |
| ResearcherExpertise | 0.64 |
| Ensemble 1 | 0.85 |
| Ensemble 2 | 0.91 |
Figure 17. Probability scores by individual classifiers
In this case, the second ensemble model had a strong enough score for the cloud to issue a blocking decision. Even though none of the individual classifiers in this case had a particularly strong score, the ensemble model had learned from training on millions of clean and malicious files that this combination of scores, in conjunction with a few other non-ML based features, indicated the file had a very strong likelihood of being malware.
Figure 18. Ensemble models issue a blocking decision
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As the queries on the malicious .js files rolled in, the cloud issued blocking decisions within a few hundred milliseconds using the ensemble model’s strong probability score, enabling Windows Defender ATP’s antivirus capabilities to prevent the malicious .js from running and remove it. Here is a map overlay of the actual ensemble-based blocks of the malicious JavaScript files at the time:
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Figure 19. Blocks by ensemble model of malicious JavaScript used in the attack
Ensemble ML models enabled Windows Defender ATP’s next-gen protection to defend thousands of customers in Brazil targeted by the unscrupulous attackers from having a potentially bad day, while ensuring the frustrated malware authors didn’t hit the big pay day they were hoping for. Bom dia.
Further reading on machine learning and artificial intelligence in Windows Defender ATP
- The evolution of malware prevention (white paper)
- Windows Defender Antivirus cloud protection service: Advanced real-time defense against never-before-seen malware (blog)
- Detonating a bad rabbit: Windows Defender Antivirus and layered machine learning defenses (blog)
- How artificial intelligence stopped an Emotet outbreak (blog)
- Behavior monitoring combined with machine learning spoils a massive Dofoil coin mining campaign (blog)
- Machine learning vs. social engineering (blog)
Indicators of compromise (IoCs)
- Doc062018.zip (SHA-256: 93f488e4bb25977443ff34b593652bea06e7914564af5721727b1acdd453ced9)
- Doc062018-2.vbs (SHA-256: 7b1b7b239f2d692d5f7f1bffa5626e8408f318b545cd2ae30f44483377a30f81)
- zobXhz.js 1f47(SHA-256: ec030da1b7943840661e32d0cb7a59d822e400063cd17dc5afa302ab6a52)
Randy Treit, Holly Stewart, Jugal Parikh
Windows Defender Research
with special thanks to Allan Sepillo and Samuel Wakasugui
Talk to us
Questions, concerns, or insights on this story? Join discussions at the Microsoft community and Windows Defender Security Intelligence.
Follow us on Twitter @WDSecurity and Facebook Windows Defender Security Intelligence.
PC gaming is at its best on Windows 10. One of the many reasons is awesome integration with Xbox. But that doesn’t mean you need be a hardcore gamer to have a blast playing games on Windows 10. Not only do your existing games work great, but now you can play and connect with gamers across Xbox One and Windows 10 devices. From the best casual games to a new generation of PC gaming, Windows 10 is built for the games you love. That’s because Windows 10 is about making all of your PC experiences more human, and that includes playing games. And we mean all games, from classics like Solitaire, to hardcore PC games like Dota 2, or games from epic Xbox franchises like Gears of War and Fable.
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From recording epic moments in virtually any game from any gaming service, to joining the world’s premier gaming community in Xbox Live, to building your gaming legacy and even streaming Xbox One games to your PC or tablet, you’ll find many great reasons to game with Windows 10. Let’s take a closer look.
Xbox Live on Windows 10
Xbox Live** has been on the cutting edge of online social gaming since 2002. It’s where gamers today get together, team up, share and comment on gaming content, and do what they love – play games. Xbox Live comes to Windows 10 via the integrated Xbox app. With Xbox Live being supported across Xbox and Windows 10 devices, gamers can now build an even larger army of gaming friends, earn achievements and kick off a new gaming legacy.
For current Xbox Live members, all your friends and Xbox Live activities come with you to Windows 10. See what your friends are up to, view your gaming legacy and continue to build your Gamerscore through the achievements you earn in-game, watch and share the epic game clips you’ve created on Xbox One or Windows 10, message and chat with friends via cross-device parties, and view your entire game collection. Whether you’re on your Windows 10 PC or your Xbox One, you’ll always have your games and gaming community at your fingertips.
DirectX 12 Brings Amazing Graphics
DirectX 12 technology unlocks the full capability of your PC’s graphics card to give you superior visuals with a higher level of realism. Because DirectX 12 is built into Windows 10, you can experience the stunning quality of DX 12 graphics, even on existing systems when you upgrade to Windows 10. ** Games created for DirectX 12, like Fable Legends, will look downright amazing. Windows 10 also gives your PC optimal CPU and GPU output when gaming, which is sweet, too. This means that when you’re playing in full screen, your PC is putting more resources into everything that makes your game run smoother and look better.
Capture Your Greatest Gaming Moments
With Game DVR**, you can capture your best moves for any game that you’re playing (hear that Solitaire fans?!) quickly, easily and without leaving your game, simply by pressing the Windows and G keys. You can then use the Xbox app – where all your gaming activities come together – to edit and share your recorded clips with your friends. Your Game DVR clips can be saved to a folder on your PC, from which you can share your recorded clips to your social channels like Facebook and YouTube.
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Cross-device Gameplay
Gamers play games on different devices today, so we made Windows 10 play with people on different devices, too. The cross-device barriers are down – starting soon, you’ll be able to play select games with or against your friends across Windows 10 and Xbox One.** Because Xbox Live reaches Windows 10 PCs, phones, tablets, and Xbox consoles, you have more options for people to play with or against. You can also start playing a game on your PC and continue later on your Xbox.
Xbox One to Windows 10 PC Game Streaming
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For Xbox One gamers, now you can stream games from your Xbox One to a Windows 10 PC, laptop, or tablet anywhere in your home.** Best of all, with support for the Xbox controller1 built right in to Windows 10, you’ll get a consistent gameplay experience no matter what device you’re playing on. You’ll even be able to stream your backwards compatible Xbox 360 games from your Xbox One!
Next week is a big one for gamers. Thanks to Windows 10, you’ll be getting more options, more control, and more general gaming awesomeness than ever before. It’s the best version of Windows for gaming. We’ll see you on Xbox Live, and good luck developing your epic gaming legacy!
**Broadband internet required for some features (ISP fees apply). Xbox Live features only available with supported games in Xbox Live-supported countries, see xbox.com/live/countries. Limited number of games available in 2015 that support cross-device play; additional games to follow. Stream to one device at a time; streaming with multiplayer from Xbox One requires home network connection and Xbox Live Gold membership (sold separately); Gold also required for multiplayer play on Xbox One. DirectX 12 only available with supported games and graphics chips. Game DVR only available with supported hardware. To check for compatibility and other important installation information, visit your device manufacturer’s website and www.windows.com/windows10specs. Xbox One, PC/Tablet and Phone versions of games all sold separately.
***Limited time free upgrade offer for qualified and genuine Windows 7 and Windows 8/8.1 devices. Hardware/software requirements apply. See www.windows.com for details.
1Xbox controller sold separately.