Gamaredon (FSB) is conducting an ongoing cyberespionage campaign against Ukrainian targets using a modular, fileless infection chain. The attack leverages HTML smuggling and archive path traversal (CVE-2025-8088) for initial access, followed by the deployment of GammaWorm, which utilizes NTFS Alternate Data Streams (ADS) and Dead Drop Resolvers (DDRs) on legitimate platforms for persistence, propagation, and C2 communication.
Alternate Data Streams
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FSB’s matryoshka #1/3 – Gamaredon’s gifts that keeps unpacking – GammaPhish and GammaWorm