I had something that is almost exactly like this from around the time when mods actually had trojans in them on a test xp laptop.
I used ComboFix to remove it, only after HijackThis, Malwarebytes, and Avast failed completely. That right there is your true last resort.
Quote from Andy-Buddy;115473:
What's the point of making viruses anyways?
Viruses were originally created between primitive hackers to prank each other. The basic foundation behind it is for pure fun or revenge.