CryptoLocker Ransomware

CryptoLocker ransomware is a ransomware strain that first appeared in 2013. In its first wave of attacks, it infiltrated computers via spam emails that included an infected ZIP file attachment. Attackers used encryption algorithms to encrypt infected files and systems, which then spread to other devices via network drives. A second version of CryptoLocker was spread through the peer-to-peer (P2P) botnet Gameover ZeuS, which used a botnet to send spam or fake emails that would lure victims into executing exploit kits.