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Russia-Aligned UAC-0099 Plants Nuclear Weapon Prompt in Malware to Disrupt AI Analysis

The Hacker News
· September 1, 2026

AI summary

Researchers have identified a new technique called GuardBreaker, used by the Russia-aligned threat actor UAC-0099 in an attack on a Ukrainian target. The goal of this technique is to disrupt artificial intelligence-assisted analysis. UAC-0099 achieves this by incorporating a specific prompt into malware, which is designed to trigger safety mechanisms in large language models. This trigger prevents the language models from functioning properly. The attack was uncovered by cybersecurity researchers at ESET. The technique is intended to interfere with the analysis capabilities of artificial intelligence systems.

Countries in focus

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This is an AI-generated brief aggregated by HackerFeeds for convenience and grounded in the source’s own summary; the related CVE, threat-group and country data is from HackerFeeds’ own indexes. The original article is the authoritative source — all rights belong to The Hacker News.