C-BRAIN was written by Pakistani brothers Basit and Amjad. Computer viruses are mainly boot viruses, and the representative viruses are "small ball" and "stone" viruses.

Computer virus is a set of computer instructions or program codes that a compiler inserts into a computer program to destroy computer functions or data, which can affect the use of the computer and replicate itself.

Computer viruses are contagious, hidden, contagious, latent, exciting, expressive or destructive. Life cycle of computer virus: development period → infection period → incubation period → attack period → discovery period → digestion period → extinction period.