In this talk, we will give an overview of the machine learning model that is the foundation of Endgame’s automated malware classifier. We will discuss challenges and best approaches to finding a metric that adequately summarizes a model's performance recognizing malware and we will show how model results inform the more tactical analysis of malware researchers.
Strategies for Landing an Oracle DBA Job as a Fresher
Machine Learning for Malware Classification and Clustering
1. Machine Learning for Malware
Classification and Clustering
Phil Roth, Data Scientist
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2. • PhD in particle astrophysics
• Switched to making images from radar data
• Switched to solving security problems with data
Phil Roth
Data Scientist
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3. Outline
• Malware Detection
• Boosted Decision Trees
• Malware Features
• Evaluating Performance
• Bringing a Human into the Loop
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4. The Problem: Antivirus
The security industry has declared antivirus as dead, but
there is no widely accepted replacement.
Machine Learning can be that replacement.
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5. The Problem: Antivirus
• Antivirus uses signatures, heuristics, and hand crafted rules
that do not scale well
• Using polymorphism and obfuscation, malware authors can
circumvent rules based detection techniques
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6. The Solution: Machine Learning
Machine Learning uses statistical techniques to learn
patterns from large datasets
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Two Steps:
• Feature Extraction
• Boundary Learning
8. Machine Learning Challenges
• Requires labels
• Requires large data sets
• Security field requires very low tolerance for errors
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9. Boosted Decision Trees
Basically, it’s a game of 20 questions
Source: https://en.wikipedia.org/wiki/Decision_tree_learning
A tree showing survival of passengers
on the Titanic ("sibsp" is the number
of spouses or siblings aboard). The
figures under the leaves show the
probability of survival and the
percentage of observations in the
leaf.
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10. Boosted Decision Trees
• The trees are built by choosing “questions” that
maximize the discrimination between two classes
• The model is called “boosted” because misclassified
samples are given higher weight in future tree building
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11. Why Boosted Decision Trees?
Proven results in security and physics
References:
https://www.kaggle.com/c/malware-classification/
http://arxiv.org/pdf/1511.04317.pdf
http://jmlr.org/proceedings/papers/v42/chen14.pdf
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12. Malware Features
The extracted features determine your
model’s performance, but there is a tradeoff
Complicated Explainable
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14. Explainable Features
Lists of capabilities don’t greatly help the model classify a
sample, but they can provide more insight to an analyst.
This sample can:
• Record keystrokes
• Send/receive network traffic
• Modify registry
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15. Evaluating Performance
We must be careful not to learn from “future” information:
time
time
Train Data
Test Data
Model Train Times
Patterns learned here….
... should not inform classifications here
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16. Bringing Humans in the Loop
Amazon built an entire tool (Mechanical Turk) to cheaply
generate labels from human intuition:
Are these products related?
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17. Bringing Humans in the Loop
Our labels are more expensive to obtain, and so choosing
what samples to label is even more important.
Is this binary malicious?
Active Learning can help!
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18. Bringing Humans in the Loop
When new data arrives, Active Learning tells analysts
which labels would be most helpful.
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19. Integration
• Our malware classifier model has been integrated into
our stealthy sensor and Hunt Platform
• Ask the other friendly Endgamers here for a demo!
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