Bureau 121

Bureau 121 is a North Korean cyberwarfare agency, and the main unit of the Reconnaissance General Bureau (RGB) of North Korea's military. It conducts offensive cyber operations, including espionage and cyber-enabled finance crime. According to American authorities, the RGB manages clandestine operations and has six bureaus.

Cyber operations are thought to be a cost-effective way for North Korea to maintain an asymmetric military option, as well as a means to gather intelligence; its primary intelligence targets are South Korea, Japan, and the United States.