The notorious Clop ransomware operation appears to be back in business, just days afterUkrainian police arrested six alleged members of the gang.

Last week, a law enforcement operation conducted by the National Police of Ukraine, along with officials from South Korea and the U.S., saw the arrest of multiple suspects believed to be linked to the Clop ransomware gang. It’s believed to be the first time a national law enforcement group carried out mass arrests involving a ransomware group.