ESET Research · August 27, 2026

ESET observes an attempted prompt injection in a UAC-0099 malware comment

Why it matters

ESET reported a safety-sensitive comment embedded in a UAC-0099 malicious VBS script, apparently intended to divert an AI analyst from examining the code. The disclosure establishes the presence and intended purpose of the text; it does not show that an analysis system stopped, missed the malware or changed its verdict.

My takeaway: Add adversarial comments to malware-analysis regression tests and measure whether analysis completes and the verdict remains grounded in code behavior. Treat sample text as untrusted data and record refusals separately from successful evasions.
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