In a joint advisory, the United States, South Korea, and the U.K. have accused North Korean hackers of conducting a global cyber espionage campaign to pilfer classified military secrets.

What Happened: The hackers, identified as “Anadriel” or “APT45” by cybersecurity researchers, are allegedly part of North Korea’s Reconnaissance General Bureau intelligence agency, which was sanctioned by the U.S. in 2015, Reuters reported on Friday.