What does a Trojan virus do exactly?

[Syringer]

?

Kill spiders is not an answer.

 

[wfbberzerker]

kill centipedes

 

[Buttzilla]

kill sperm?

 

[FoBoT]

they are named "trojan" after the trojan horse of greek mythology. the virus puts software on your PC that allows access and/or remote control of your system by the bad guy.

they then use your system for spamming or DDoS attacks or stealing your passwords/CC info, etc, etc

 

[raanemaan]

Puts holes in your protection

 

[GroundZero]

has safe sex