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.

Linux that was assumed to be "safe" from malware is getting attention from attackers. RedXOR is a Linux malware allegedly attributed to Chinese hackers.

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.

PuTTY was primarily written for Windows but with it exponential popularity Port of other operating systems were created.