Nasty Punch Worm

Silicon.Com reports that a worm found spreading via America Online's Instant Messenger is carrying a nastier punch than usual, a security company has warned.

The unnamed worm delivers a cocktail of unwanted software, including a so-called rootkit, security experts at FaceTime Communications said on Friday. A rootkit is a tool designed to go undetected by the security software used to lock down control of a computer after an initial hack.