The biggest news in the security world in recent days has been the FBI’s takedown of the GameOver Zeus botnet and Cryptolocker ransomware.

GameOver Zeus allowed cyber criminals to conduct more than $100 million in wire fraud in the just more than two-and-a-half years that the botnet was active. The malware affected computers running Microsoft Windows operating systems and captured credit card numbers and login credentials to financial sites, including credit unions, and had features that allowed it to bypass two-factor authentication security controls.

Gameover was the most sophisticated variant of the Zeus Trojan, which is used to steal banking information. GameOver Zeus leveraged a peer-to-peer network to hide the criminals’ backend infrastructure, which allowed attackers to control their botnet and make it difficult for researchers and law enforcement to disrupt it. Whereas other Zeus variants are sold as botnet kits, GameOver Zeus was run by a single group of threat actors that rented it to other cyber criminals.

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