Malware
SoWaT
This is an implant used by APT31 on home routers to utilize them as ORBs.
SoWaT is a Linux malware family operated by APT31.
Background
SoWaT is an implant that APT31 deploys onto home routers in order to repurpose them as ORBs.
Source: Malpedia (Fraunhofer FKIE).