Trusted DesignGamaredon, a cyberespionage group operated by Russia's FSB, conducts long-term intrusion operations targeting Ukrainian government, military, and critical infrastructure. This analysis documents their 2026 infection chain, which uses HTML smuggling with weaponized xHTML files delivering RAR archives that exploit CVE-2025-8088 to extract HTA files into Windows Startup directories. The chain deploys GammaPhish for initial access, GammaLoad for staging, GammaWorm for propagation via USB and network drives, and GammaSteal for exfiltration. The architecture is nearly fileless, leveraging NTFS Alternate Data Streams to conceal modules and using Dead Drop Resolvers on legitimate platforms like Telegram and Cloudflare for C2 infrastructure. Every stage functions as an independent backdoor capable of executing arbitrary VBScript, representing a shift from their historical Pteranodon framework to a modular ecosystem designed for persistent espionage.
Created: 2026-06-02
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