6/6: Grogotix.A Worm Prevents Users and Programs From Accessing Sites
Grogotix.A is a worm that prevent users and installed programs from accessing certain websites, which belong to several antivirus companies, among others.
Additionally, it disables the following functions, among others:
Grogotix.A spreads via IRC. In order to do so, it connects to certain servers and sends messages that contain a link to the users that are connected at that moment.
Technical details can be found at this Panda Software page.