The FBI issued a second warning this week to alert US companies of ProLock ransomware operators stealing data from compromised networks before encrypting their victims’ systems. The FBI also warned private industry partners that ProLock’s decryptor is not working properly and that data will be lost since files over 64MB might be corrupted as part of the decryption process. ProLock has successfully encrypted the networks of organizations around the world from multiple industry sectors including healthcare, construction, finance, and legal, including US government agencies and industrial entities.
Source: https://www.bleepingcomputer.com/news/security/fbi-issues-second-alert-about-prolock-ransomware-stealing-data/