Turkish security bod Utku Sen has published what seems to be the first open source ransomware that anyone can download and spread. The 'Hidden Tear' ransomware, available at GitHub, is a working version of the malware the world has come to hate. It uses AES encryption to lock down files and could display a scare warning or ransom message to get users to pay.

Sen says the malware will bypass detection by all familiar anti-virus platforms. “While this may be helpful for some, there are significant risks. Hidden Tear may be used only for educational purposes. Do not use it as a ransomware,” says Sen.

Sen's Hidden Tear video demonstration shows how the ransomware can encrypt and decrypt files leaving a text document note on the victim's desktop. Various files can be encrypted including word processor documents, spreadsheets and Powerpoint.