Nasty little bugger to get rid of. Comes from a bunch of different sources essentially opening a gateway to ad bots and malicious code. In the process of getting it off my system, I learned a bunch about antivirus programs and what had been sitting on my own machine for years.
Over the last 5 years or so I've used Symantec's Internet Security suite, McAfee Spy/antivirus scanner and AVG's antivirus product as well. All of them set to perform routine scans of the entire system.
In the process of getting help from the Spybot forum guru's and running Kaspersky's online scanner and Hijackthis, that there was some 170 plus incidences of e-mail worm code sitting in old e-mail archives besides the nasty regenerating Abetterinternet and Virtumonde and others. I was very surprised that neither of the three programs I had run never found the worms. I was also surprised that CWShredder, RogueRemover, Spybot, Ad aware and what not were unable to get rid of the new trojans.
These things came from Myspace pages that other kids had setup that my oldest visited from my machine. The only thing that kept her system alive upstairs was the Spybot running in immunize mode. Mine was an older version that didn't have that feature (I'd been using Ad Aware downstairs).
Anyhow be careful out there and if you get this bug (or any of the other really nasty critters) the great folks at spybot have a forum site much like this dedicated to helping people out
http://forums.spybot.info/index.php
They are not selling anything at that site so the link should be OK - if not Doh - my bad!