Virus- Trojan Horses
Trojan horses are installed to do one job on the surface
while they secretly carry out harmful activites. They can
make the computer vulnerable to attack, by opening up
the firewall or knocking out the security. With a 'back door'
criminals can then secretly gain control of the computer
and use it to send out viruses or steal information.
Harbouring known criminals (including various spyware
and viruses), illegal back door creation, aiding and abetting
fraud and identify theft, zombification.