Btdefender.exe is the malicious process of Internet Security virus (and other rogue security programs with similar interface and other name variations). This type of fake anti-virus application comes to vulnerable computer without user’s consent or approval. This very penetration may take place by means of Trojan horses, malicious and infected links, downloads from non-secure resources and even while using the account of social networks like Facebook. Some cyber hackers originate the massive spam attacks in Facebook and via e-mail accounts using links that lead to malware installation platforms and thus bring these viruses into PCs.