AcidRain is an ELF binary targeting modems and routers using MIPS architecture. AcidRain is associated with the ViaSat KA-SAT communication outage that took place during the initial phases of the 2022 full-scale invasion of Ukraine. Analysis indicates overlap with another network device-targeting malware, VPNFilter, associated with Sandworm Team. US and European government sources linked AcidRain to Russian government entities, while Ukrainian government sources linked AcidRain specifically to Sandworm Team.