Computer Viruses


A virus is a program that copies itself without the knowledge of the computer
user. Typically, a virus spreads from one computer to another by adding itself
to an existing piece of executable code so that it is executed when its host
code is run. If a virus if found, you shouldn't panic or be in a hurry, and
you should work systematically. Don't rush!

A Viruse may be classified by it's method of concealment (hiding). Some are
called stealth viruses because of the way that they hide themselves, and some
polymorphic because of the way they change themselves to avoid scanners from
detecting them.

The most common classification relates to the sort of executable code which the
virus attaches itself to. These are:

¨ Partition Viruses ¨ Boot Viruses ¨ File Viruses ¨ Overwriting Viruses

As well as replicating, a virus may carry a Damage routine.

There is also a set of programs that are related to viruses by virtue of their
intentions, appearances, or users......

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Title: Computer Viruses
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