The final stage isthe execution of the attack, in which the attackerproceeds to launch the attack against the target[19].2.2.2 VirusesA virus is a piece of software that can infect other programs by modifying them as viruses attachthemselve to a program and propagates copies of themselves to other programs[31].Once a virus isexecuting,it can perform any function such as erasing files and programs.