From bleepingcomputer.com
Using standard tactics, the operators of ProLock ransomware were able to deploy a large number of attacks over the past six months, averaging close to one target every day.
Following a failed start in late 2019, under the name PwndLocker, due to a crypto bug that allowed unlocking the files for free, the operators rebooted the operation with fixing the flaw and renaming the malware to ProLock.