To all of you n00bs out there, it is a virus (but one that doesn't fry your console nor your files). And it was sperad across the MS X-Box Live Network so you can blame the coder, IW and MS for all I care, but the fact that it bypassed the security model of the X-Box (if there's any in there) is a fact and it will prolly not be the last "noticeable" exploit we see in the near future. Live with it, your consoles are not "virus free"; never have and never will.
Cheers! XD!