DearCry Ransomware or as Microsoft debut it as DoejoCrypt Ransomware is targeting new zero-day ProxyLogon vulnerabilities in Microsoft Exchange servers. It uses AES-256 to encrypt the files and the RSA-2048 public key to encrypt the AES key.
HelloKitty ransomware encrypts user data AES-256 + RSA-2048 or AES-128 + NTRU and give a special onion domain link to the user to contact for ransom negotiations.
Hog ransomware encrypts its victims data using AES-256 algorithm and ask them to join there Discord Server as a ransom payment.
Sarbloh means "Iron" Punjabi, is targeting users in India. It encrypts user data and ask the user to support the on going farmer's protest by pressurizing the Indian governments to roll back the fascist law.
Povlsomware Ransomware is an open source ransomware available on github. It is written in C# and claims to test the "ransomware protection claims" by Anti-malware / security solutions.