botnet
Botnet (=roBOT NETwork), also called zombie army, is a network of
compromised computers that are being used without their owners' consent
to spread malware
or perform different activities for the
benefit of the botnet owner.
Usually a botnet is controlled by a
trojan horse that enables the botnet
owner to control the zombie PC for any purpose.
There is a thriving botnet business selling lists of compromised computers to
hackers and spammers.