Hidden file in downloads folder tricked AI coding agents into running malicious package

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A malicious AGENTS.md file left in a Downloads folder tried to get an AI coding assistant to install an npm package linked to the MALFEX malware campaign. Security tools blocked the attempt, but tests showed that Codex followed the planted instructions in more than 90% of cases. A similar test with Claude Code succeeded about half the time, since that tool asks for user approval. Researchers noted that the tools are working as designed, following instructions in their working folder, and they also showed that websites can save files to a Downloads folder automatically. To reduce risk, they advise against opening coding assistants in the Downloads folder, checking for unfamiliar instruction files, and keeping approval prompts enabled.

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