An unusually advanced hacking group has spent almost two years infecting a wide range of routers in North America and Europe with malware that takes full control of connected devices running Windows, macOS, and Linux, researchers reported on Tuesday.

So far, researchers from Lumen Technologies’ Black Lotus Labs say they’ve identified at least 80 targets infected by the stealthy malware, infecting routers made by Cisco, Netgear, Asus, and DayTek. Dubbed ZuoRAT, the remote access Trojan is part of a broader hacking campaign that has existed since at least the fourth quarter of 2020 and continues to operate.

A high level of sophistication

The discovery of custom-built malware written for the MIPS architecture and compiled for small office and home office routers is significant, particularly given its range of capabilities. Its ability to enumerate all devices connected to an infected router and collect the DNS lookups and network traffic they send and receive and remain undetected is the hallmark of a highly sophisticated threat actor.