A computer virus that actively attacks an anti-virus program or programs in an effort to prevent detection is...

A retro virus is specifically designed to attack antivirus software and security programs to avoid detection. Unlike regular viruses that may avoid detection passively, retro viruses actively target, disable, or corrupt the antivirus programs themselves. Worms replicate across networks, trojans disguise themselves as legitimate software, and 'ghost virus' is not a standard classification. The key feature of a retro virus is its offensive action against security software.