Viruses | Trojans | Worms

Our image server has one of these, not quite sure. When we erase all the files it creates and restart the computer, all the files are back on. There is a message on the server saying “Hacked by [ ignorant hacker name here ]”. I forgot the exact name, but that does not matter.

Does Ad-aware seak out Trojans or Worms like this?

Some how it got past Norton!