Santa Claus worm strikes IM clients
By Tom Krazit, IDG News Service

We've had Dasher trying to disrupt computers over the Xmas period, now Santa Claus himself is trying to get in on the action.

Rather than targeting Windows machines though, the new IM.GiftCom.All worm is using instant messaging to spread its unjolly message. The worm promises to take users of AOL, Yahoo and Microsoft's IM software to a festive Santa site.

But clicking on the link will take users to a different site where a malicious file is downloaded to your computer. The file is difficult to detect with conventional anti-virus tools and also attempts to shut down anti-virus software while it collects personal information, then redistributed over the Internet.

The message comes from someone already present on a user's "buddy list",