Well, it was bound to happen sooner or later. Skype, an IM service, has had a vulnerability exploited through a trojan. To be brief, if you use Skype and don’t want to get this Trojan, make sure you don’t download anything from it, no matter how appealing it sounds.

WebSense on Monday identified a Trojan horse that targets Skype IM users in what marks the latest in a series of instant messaging attacks this year.

The security researcher first reported the attack as a self-propagating worm called “sp.exe.” After a full day of investigation in cooperation with Skype and its parent company eBay (Nasdaq: EBAY) , WebSense issued an update saying it was a Trojan horse.

Trojan horses are programs that appear harmless, or even helpful, but harbor malicious code used to collect or destroy data.

“What’s unique about this Trojan horse is that it uses Skype as its vehicle for propagation,” Dan Hubbard, vice president of security research at WebSense, told TechNewsWorld. “But this is not dissimilar to Trojans that have attacked other messaging platforms in the past, like ICQ and Microsoft Messenger.”[more]

Tags: Malware, Computer Protection, Voicemail/VoIP