How to Spot Fake Claude Code Repos and Protect Yourself from AI Tool Malware
The Claude Code source code leak of March 31, 2026 created an immediate security hazard: threat actors began distributing Vidar infostealer malware through convincing fake GitHub repositories within 24 hours. If you’ve cloned any Claude Code fork from an unofficial source since then, this guide is for you. This is a practical, step-by-step walkthrough for: Verifying whether you downloaded a legitimate or fake Claude Code repo What to do if you ran a malicious installer How to protect yourself going forward Step 1: Verify the Repository You Downloaded Check the GitHub organization The only legitimate Claude Code repository is under the official Anthropic GitHub organization: ...