zombie computer

A computer connected to the internet that has been compromised by a some form of virus. An infected machine will generally be used to perform malicious tasks of one sort or another under remote direction through a botnet.
Because most owners are unaware that their system is being used this way, these computers are metaphorically compared to zombies.

There are 148,000 new zombie computers created per day.

by DethBoxX v1 March 5, 2010