Some organizations track North Korean clusters or groups, such as Bluenoroff, APT37, and APT38 separately, while other organizations track some activity associated with those groups as Lazarus Group. Malware used by Lazarus Group has correlated to other reported campaigns, including Operation Flame, Operation 1Mission, Operation Troy, DarkSeoul, and Ten Days of Rain. Some organizations use Lazarus Group to refer to any activity attributed to North Korea. North Korean group definitions have significant overlap, and the name Lazarus Group encompasses a broad range of activity.