ALPHV/BlackCat reportedly received $22 million from Change Healthcare before scamming its affiliates ahead of a possible rebrand.

Ransomware strains such as Maze, Ryuk and BlackCat have increasingly been part of FIN7's playbook in recent years, Mandiant says.

European officials do not currently believe that some of the attacks are linked.

Several key factors make the ransomware one of the fastest-growing variants, researchers say.