Some how I think this "worm" is somehow protecting the computer.(It's my guess but it sounds great.) The worm help the computer owner's by not allowing them to access the crappy antivirus they have floating around. It's like Kira from Deathnote, whoever he/she is they help protect the everyday person.

B.T.W. GLG there is an E variant, look here for more info http://en.wikipedia.org/wiki/Conficker .