Computer Virus - the computer virus is the most popular and widely-distributed type of rogue software.there are three definitions which are used to define a computer virus.*it is an acronym which stand for V-ital I-nformation R-esource U-nder S-eige.*A program which can replicate itself without
infecting any host program.*A program that duplicates itself by infecting other programs.The
definition is too broad that it actually refers to rogue software in general.The second definition actually refers to a worm.it tis similar to a computer except that it replicates as as separate program rather than infecting and hiding in other programs.A worm is common in network installations where it can attach to several computers connected to the network.The third definition is the most accurate of a computer virus.it can be programmed to do many things.
Viruses can display text or graphics on screen,destroy files or erase the contents of an entire hard disk.Viruses are created by very good
programmers and this may make wonder why people with such talent create a destructive program like a virus.There are two accepted reasons for this:the first one is revenge and second one is claim to fame.Disgruntled programmers can write a virus in order to get even with a former employer.For others,creating a virus is their ticket to display the name and even a picture of the programmer.The
ultimate goal of virus programmers is to create the ultimate virus.An ultimate virus is virus that can remain completely undetected until it strikes and do whatever it is programmed to do.A virus can be triggered to cause destruction in several different ways:*Randomly-Triggered viruses are
designed to attack at random.one such example is the ambulance car virus displays a moving ambulance car across the bottom of the screen.*Date Activated viruses wait for a pre-defined date before it strikes.one such example is the Michelangelo,which is designed to activate itself on the 6th of march - the artist's birthday.*Boot -count viruses will count the number of times the computer is booted for example,the telecom virus will activated itself on the 400th boot.The virus will then destroy the contents of the hard disk.
Published: August 23, 2007
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