The UK National Cyber Security Centre (NCSC) on Tuesday published an advisory warning that Russian state hacking group APT28 has been exploiting vulnerable small office and home office (SOHO) routers since 2024 to overwrite their DHCP and DNS settings, redirecting downstream traffic through attacker-controlled DNS servers to harvest passwords and authentication tokens for web and email services. The NCSC assesses that APT28 is "almost certainly" the Russian Main Intelligence Directorate (GRU)'s 85th Main Special Service Centre, Military Intelligence Unit 26165.
According to the advisory, the actor has been configuring virtual private servers to act as malicious DNS resolvers, then pointing compromised SOHO routers at them by rewriting the routers' DHCP DNS settings. Laptops, phones, and other downstream devices on the network inherit those settings automatically and begin sending lookups to the attacker-controlled infrastructure.
