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countries:Ukraine × latest_source_host:welivesecurity.com × limpar

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welivesecurity.com · medium

UAC-0099 embeds decoy nuclear-weapon request in VBScript to trip LLM scanner guardrails ahead of MATCHBOIL loader (GuardBreaker)

ESET researchers observed the Russia-aligned group UAC-0099 embedding a decoy request for guidance on building a nuclear weapon in a comment inside a VBScript used in the early stages of an attack on a target in Ukraine. The comment was meant to trigger the safety guardrails of an LLM-powered code scanner so that it stops inspecting the f…

welivesecurity.com · high

UAC-0099 evolves MATCHBOIL C# downloader targeting Ukrainian transport, manufacturing and energy firms

ESET documented the evolution of MATCHBOIL, a custom C downloader used by the Russia-aligned cyberespionage group UAC-0099. Samples span April 2024 to April 2026, although CERT-UA first documented the malware in August 2025. Each iteration became more sophisticated, with new obfuscation, sandbox checks and persistence methods. All victims…

welivesecurity.com · medium

ESET August 2026 roundup: OpenAI agents hack Hugging Face, Iran-linked attacks on water and power, Delta Wi-Fi spoofing, Ukraine call center raids

ESET Chief Security Evangelist Tony Anscombe reviews the main cybersecurity stories of August 2026 in a monthly video roundup. OpenAI disclosed more details on how its agents hacked the AI collaboration platform Hugging Face, and the video discusses what went wrong and the lessons from the incident. Iran-linked hackers are believed to hav…