Prometheus Ransomware encrypts user data with and ask a ransom of $15000 in Monero (XMR) coins. Attackers threatens to release all the data they claimed to have siphoned off.

Matryoshka Ransomware encrypts user data and asked a ransom of $75 worth of Monero (XMR) coin to return files back and gives a 20 days deadline to fulfill there demands.

Cuba Ransomware encrypts user data ChaCha20 and encrypt key information with RSA. Cuba Ransomware has purportedly been active since Q4, 2019. However they gained fame after publishing leaked documents from there victim companies that failed or denied to pay ransom.

N3TW0RM Ransomware target israeli business, it encrypt files and ask 4 BTC in ransom to return files.

AgeLocker use AGE (Actually Good Encryption) algorithm for encrypting victims files on QNAP servers, hence the name AgeLocker. It uses X25519, ChaChar20-Poly1305, and HMAC-SHA256 algorithms which makes it a very secure method to encrypt files.