To thwart malware planted by Russia’s Fancy Bear hacker group on an estimated 250,000 routers in Ukraine

To thwart malware planted by Russia’s Fancy Bear hacker group on an estimated 250,000 routers in Ukraine, the F.B.I. recommends: Turn off the router, then turn it back on. Rebooting the device will temporarily disrupt the malware. Users also are advised to upgrade the router’s firmware and to select a new password. If remote-management settings are in place, disable them.