Virtumonde is a virus?

Right now i'm running Spybot Search & Destroy. It has gone through thousands of files and the register as vitumonde.dll, virtumonde.sdn, and so on. So what i'm having trouble with is believing it's a virus! I just re-formatted my hard drive yesterday because there was too many viruses and i couldnt get rid of them. Virtumonde was also present before i did that but malwarebytes, AVG, spybot, and spyware terminator all failed to detect it and remove it. So is virtumonde truly some super virus or what?