Two elements of the attack have been noted - one with a stand-alone application that commonly disguises itself with a faked version of Microsoft's Internet Explorer logo, and another (a self-propagating iteration of the worm) that utilises an .exe file. The latter spreads through the Yahoo Messenger directories.
The technique of spam over instant messaging is referred to as "spim", and is a growing problem as IM applications and protocols are an increasingly popular vector for malware.
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