A cyber criminal gang has developed a singular ransomware called RANSOM_CRYPTEAR.B. The cyber criminals made a serious error in the development, resulting in victims files being completely unrecoverable. The malware researchers analyzing the source code discovered that it was a modification of a proof-of-concept ransomware dubbed Hidden Tear that was leaked online by the Turkish coder Utku Sen for educational purpose. The Hidden Tear is available on GitHub and its fully functional, it uses AES encryption to encrypt the files and displays a warning to pay up to get their data back.”]
Source: https://securityaffairs.co/wordpress/43585/cyber-crime/flawed-ransom_cryptear-ransomware.html