Hello there. We would like to thank all of you for the comments. Now, we would like to talk about viruses where one of the commenter ask some questions regarding this topic. Based on our reading their three main viruses called trojan horse, worm viruses, and logic bomb viruses....
In a trojan horse virus scenario, when the virus code is hidden in the host program,the virus programmer satisfies the "inserts into a program" .
Worm programs are generally inserted directly into a computer network or bulletin board system and infect computers throughout the system. Threfore, by inserting the worm virus directly into the network or bulletin board system.
Logic Bomb programs are inserted directly into a computer or a program and activate upon the occurenceof a designated event.