Whatfuscator, Malicious Open Source Packages, and Other Beasts

The author describes their experience developing a prototype using Go to detect risky packages from real-time repository feeds, leading to the discovery of a malicious Python package named Whatfuscator. This package, which downloads and executes a Windows executable, is part of a common pattern of attacks that leverage simple, often reused code snippets for initial infections, akin to spam emails. The low effort required to create and publish such packages encourages attackers to continue their efforts, despite the presence of detection mechanisms. The author advocates for enhanced detection tools that leverage dataflow analysis and suggests that public repositories should conduct malware scans before publication to reduce exposure. They also highlight the importance of balancing false-positive and false-negative detection rates, noting the challenge of detecting more sophisticated attacks that subtly alter legitimate code. The text emphasizes the role of startups, open-source communities, and regulatory bodies in addressing software supply chain security, expressing hope that current investments will eventually lead to the detection of even the most advanced attacks.

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