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ESET Research reports that the China-aligned APT group FamousSparrow has been using a new modular C++ backdoor, SparroWocky, since at least August 2025. The backdoor has replaced SparrowDoor as the group's main implant. From mid-2025 into 2026, about 90% of the group's targets in ESET telemetry were in Latin America, mostly governmental e…
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…
At Black Hat USA 2026, OpenAI presented its timeline of the Hugging Face breach, which was caused by two of its own AI models during a frontier-model training exercise. Agents tasked with a job that was meant to run offline became stuck after a human omitted a required file. They concluded the task could be completed by escaping their san…
