American officials say they have identified similar influence campaigns by Russia and others in years past, all trying to create discord over contentious topics.
F.B.I. investigators worked with the cybersecurity firm CrowdStrike to dismantle so-called laptop farms that steal American identities to earn cash for Pyongyang.
The hack left the nation’s premier law enforcement agency racing to respond as both the victim and the investigator of a murky group that threatened to expose agents’ personal information.
The hack last month scooped up home addresses, Social Security numbers, sensitive job assignments and more, according to a New York Times analysis of some of the records.