August 28, 2026
- UAC-0099 is deliberately tripping LLM safety filters to block malware analysis. ESET documented GuardBreaker, used against a Ukrainian victim: the operators pad a malicious VBS downloader with a comment asking for help building a nuclear weapon, so an AI-assisted analysis pipeline refuses and never reaches the actual MATCHBOIL installer logic (ESET Research). Anyone running LLM triage in a malware workflow should assume this is now standard tradecraft. · AI & Model Security
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