A virus which uses scare tactics (by telling the computer user they have viruses) to steal their money. "The Rogue" is also an Achievement in Fable II, for stealing something right in front of someone else. A good example of a rogue virus is SpywareGuard 2008, or AOL.
Damn man, why does a rogue virus have to bring about a million other impossible-to-delete infections with it?!