What is a Zombie Computer?

A zombie computer is a computer that is connected to the Internet and has been compromised secretly. Malware software such as rootkits, computer viruses or trojan horses allow a hacker to control computer and its resources remotely and execute a variation of malicious tasks and illegal activities.

A network of zombie computers (botnet) are used to launch denial-of-service (DDOS/DOS) attacks, send spam, attack websites, compromise other computers etc. Because most of the owners of zombie computers are unaware that their system has been compromised and is being used in this way, these computers are compared to zombies.