The fire, which did not seriously damage the network, came after similar incidents in Bulgaria and Poland involving the satellite internet provider, a key defense tool for Ukraine’s armed forces.
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 attack targeted a Danish software system in more than 400 supermarkets, forcing some shops to throw out frozen produce. The attackers have not been identified.
The cybersecurity firm said the attacker was likely a Chinese speaker and financially motivated, but did not attribute the attacks to a named individual or group.