Virus is a bunch of binary code or program code which have ability to duplicate itself to memory and hard disk and modifies any specified working process. It’s also can change the target internal structure, so the target must run the virus (autorun).
Virus is often break processes, block some programs, delete informations from hard disk, etc. In it’s development, virus has a lot of various kinds,and most of the virus always making the computer run slower.
Example: Brain, Ohe half, Die hard, XM/Laroux, Win95/CIH.
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