Computer virus: It is a program, a piece of executable code, which spreads through disks, tapes and networks as a medium, and can infect other programs. Just like biological viruses, computer viruses have unique replication capabilities and a latent, infectious and destructive program that realizes self-replication and exists with the help of a certain vector.
According to the above definition, which of the following is a computer virus?
A piece of program code that changes the contents of the computer registry