Ransomware is one of most dangerous cyber threats for end-users. Turkish security researchers Utku Sen has published the first open source ransomware for educational purposes that anyone can use. The Hidden Tear is available on GitHub and its fully functional, it uses AES encryption to encrypt the files and displays a warning to users to pay up to get back their data. The Hidden Tear may be used only for Educational Purposes. Do not use it as a ransomware!”]
Source: https://securityaffairs.co/wordpress/39419/cyber-crime/ransomware-open-source.html