Gameover Zeus or Zeus is a botnet which spread over in September 2011 is a peer to peer (P2P) variant of Zeus family affect about millions of users all over the world. It uses Domain Generation Algorithm(DGA) is distributed via email and once the infected user access the website from the computer which is compromised by Gameover Zeus can intercepts their online session using Man in the Browser(MITB) and avail information like login credentials and has the capability to perform other malicious activities. Once the attacker gets the details of banking information can able to steal their money.
The other ransomware that was appeared in September 2013 is Cryptolocker Ransomware which has the capability to the decrypt the files on the infected computer and demand for the certain amount of payment to unlock the files which is mostly spread over the internet and the dangerous part is it uses strong encryption that cannot be broken was distributed via spam emails, phishing emails in order to compromise the computer.
These two plays the vital role in spreading and the attacker earn more with this malwares. The Department of Justice announced that FBI, UK’s National Crime Agency and a number of internal law enforcement agencies have disrupted on these world famous malwares. Symantec released the removal tool and added the steps for removing Gameover Zeus and Cryptolocker Ransomware from the affected computers and it can be downloaded here.