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GRU Military Unit 26165 is a cyber operations unit within Russia's Main Intelligence Directorate of the General Staff (GRU). It has been linked to espionage-focused operations that leverage compromised small office and home office routers as covert infrastructure. In documented activity, the unit exploited known vulnerabilities and stole credentials to gain access to large numbers of internet-exposed routers, then modified DNS settings to support DNS hijacking and related intelligence collection operations. These operations were used against victims of intelligence interest to the Russian government, including military, government, and critical infrastructure organizations and individuals worldwide. The unit's tradecraft in this activity included initial access through exploitation of vulnerable edge devices, credential theft, persistence through device reconfiguration, and defense-evasion through use of third-party compromised infrastructure to mask operator activity. The actor is assessed as a Russian state threat actor whose dominant mission in the reported activity was espionage.
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