In 1987, two Pakistani brothers, Amjad and Basti released the first IBM virus “C-Brain” to stop illegal reproduction of software developed from Alvi’s Brain Computer Shop. In 1983, an American electronic engineer ‘Fred Cohen’ had used the word “Computer Virus” in his research paper for the pr ogram that replicates and prevents other programs to be executed. The first replicating program named “Creeper” was reported during 1970 in the network system of American department of Defense. John V on Neumann introduced the concept of replicate computer program. It is the intellectual destructive creation of computer programmer. It infects data or program every time the user runs the infected program and it takes advantages and replicates itself. Whenever a host file or program is used, the virus become active and performs destructive tasks such as dislocating, deleting and changing contents of file s. Means to a computer without the knowledge and permission of the user and they can hide themselves in other files. Computer virus can transfer from different In other words, a computer virus is a program designed to spre ad itself by first infecting executable files or the system areas of hard and floppy disks and then making copies of itself. Computer viruses are the software programs that have the ability to clone itself and can operate without the knowledge or desire of the computer user.
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