FSB’s matryoshka #1/3 – Gamaredon’s gifts that keeps unpacking – GammaPhish and GammaWorm

This investigation is published in three parts. Follow the links below to navigate through our findings: Key Takeaways Introduction Sekoia.io’s Threat Detection & Research (TDR) team closely monitors the activities of Russian Advanced Persistent Threats (APT). In late December 2025, we deployed an opportunistic YARA rule designed to uncover novel initial access vectors. By January […]

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