Xorer.O is a worm that only affects computers that belong to the same local network.

Its main aim is to capture and modify the HTTP-type network packets that are sent from the computers.

As a consequence, the websites requested by the user will be displayed with alterations. However, this anomaly will not be displayed in the infected computer.

Xorer.O spreads through the local, removable and mapped drives, making copies of itself in them.

Technical details can be found at this Panda Software page.