The malware system is able to render the routers inoperable, and can also collect information passing through the router.
The FBI is urging those with small offices and home offices to reboot their routers after "foreign actors" infected thousands of routers with malware.
The FBI said it would gather the IP addresses of infected devices, and pass those to the Shadowserver Foundation to disseminate among ISPs and non-US CERTs.
The FBI is recommending any owner of small office and home office routers immediately power cycle (reboot) the devices.
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Officials say there's a simple step you can take to protect yourself.
The malware, dubbed VPNFilter, was developed by the Russian state-sponsored hacking group Sofacy, also known as Fancy Bear and APT28, according to the Federal Bureau of Investigation, which last week obtained a warrant to seize a domain used to control the infected routers.
Last week, the Dept. of Justice announced the seizure of an internet domain at the center of the Kremlin-backed botnet believed to have compromised more than half a million small business and home office network routers around the world. Now, those attempts will be redirected to the FBI-controlled server, which will help identify infected devices. Also, Network devices should be upgraded to the latest available versions of firmware. Those who are using remote management settings on mobile devices are advised to disable them.