FBI says it knows of at least 60 organizations worldwide that fell victim to Alphv/BlackCat by March. The criminal group posts names and leaks data for a subset of its victims, as part of a double-extortion tactic. The FBI is seeking any information that can be shared, to include IP logs showing callbacks from foreign IP addresses, Bitcoin or Monero addresses and transaction IDs, communications with the threat actors, the decryptor file and/or a benign sample of an encrypted file.”]
Source: https://www.govinfosecurity.com/fbi-alert-have-you-been-bitten-by-blackcat-ransomware-a-18958