Anti-worm has multiple meanings within the field of computer security . It can be a piece of software designed to protect against computer worms , combining the features of anti-virus software and a personal firewall . It can also mean a worm designed to do something that its author feels is helpful. Concept: The concept of "Anti-Worms" is a proactive method of dealing with virus and computer worm outbreaks. Just like malicious computer worms, anti-worms reach computers by scanning IP ranges and placing a copy of themselves on vulnerable hosts.