Viruses, Trojan Horses and Worms

Two Pakistani brothers who were programmers in the mid 1980’s learned that the program they had written was being copied without permission. In response, they wrote a program that copied a copyright message on to the customer’s computer. Thus, the first computer virus was written. From this simple beginning, came the formation of a wide anti-virus culture. Today, new viruses can spread worldwide in minutes, damaging information, slowing network connections and ruining prestige.

What is a virus?

Virus or worm, often without the knowledge of the user by copying itself, is a computer program that can spread through computers and networks. Viruses can create harmful effects. This screen displaying annoying messages to other users can be dated to give control of your PC.

How the virus spread to computers?

A computer virus must be run before it can be spread. Viruses use many methods to spread. 

Trojan Horses

Trojan horses appear to be legal and proper, but in fact they are secret and malicious software programs. 


Worms are similar to viruses, but do not require being carried to documents or programs.  There are worms and viruses such as MyDoom, Bagle, that act and spread by multipling through e-mail.

What do Viruses do?

Viruses cause E-mail to slow down. E-mail viruses such as Sobig spread by e-mail traffic, until the mail server becomes extremely slow and eventually crashes. 

Computers installed in the university use anti-virus software such as; Avast, Norton, BitDefender, Karspersky, Mcafee, etc..  The software can be accessed at http://yis.pamukkale.edu.tr

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