ukbobboy01,

Sounds like your talking about heuristic scanning. This is a real hit and miss way of looking for a virus. What if your virus does not display "virus like behavour". Not all virus need to open ports, send 1,000 emails etc.

If this virus has modified Limewire I doubt any heuristic type of scan is going to work unless it is tailored for Limewire or Limewire does something wierd that makes it fall within the heuristic search template.