CryptoLocker

CryptoLocker is grand-scale ransomware, and is believed to have been first posted on the internet on September 5, 2013, cultivated through an email attachment and over the Gameover Zeus botnet. It exerted influence on systems running on Microsoft Windows, and was spread through malicious email attachments and used to encrypt certain types of files stored on the local and network drives of a user, using RSA encryption. CryptoLocker was removed in late May 2014 through the Tovar operation, which took down the Gameover Zeus botnet. It was reported that CryptoLocker successfully extorted more than $3 million from victims.