Virtumonde also known as Vundo, Trojan Vundo, Virtumondo, and MS Juan is a trojan designed to do the following:

Cause popups warning of virus and spyware infections
Trick user to purchase rogue anti-spyware programs
Slow your computer down
Hijack your internet browser; disallows access to websites and forces users to malicious websites for downloading additional spywae

In addition, most users [...]