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what is a computer virus

A computer virus is a malicious program that self-replicates by copying itself to another program. In other words, the computer virus spreads by itself into other executable code or documents. It is quite easy and simple for the viruses to sneak into a computer by dodging the defense systems.

A computer virus is a malicious program that self-replicates by copying itself to another program. In other words, the computer virus spreads by itself into other executable code or documents. It is quite easy and simple for the viruses to sneak into a computer by dodging the defense systems.

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What <strong>is</strong> a Computer Virus?


CLASSIC VIRUS<br />

Classic <strong>virus</strong> <strong>is</strong> a term that was coined in 1983. These <strong>virus</strong>es are malicious programs that rewrite ex<strong>is</strong>ting<br />

<strong>computer</strong> code on your <strong>computer</strong>. Classic <strong>virus</strong>es are not so much unwanted additions to your system as<br />

they are mutations of ex<strong>is</strong>ting code .


TROJANS<br />

Trojans, or Trojan Horses, are additions to your system. These malicious programs masquerade as<br />

legitimate files in your email, deceiving you into willfully adding them to your hard drive. Trojans rely<br />

on you to intentionally open your <strong>computer</strong> to them. Once on your machine, Trojans then function<br />

as independent programs that operate secretly. Trojans commonly steal passwords or perform<br />

denial of service (overload your system) attacks. Examples of Trojans include Backdoor and Nuker.


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WORMS<br />

Worms, or Internet Worms, are also unwanted additions to your system. Worms are different from<br />

Trojans, though, because they copy themselves without your direct ass<strong>is</strong>tance... they robotically<br />

worm their way into your email, and begin broadcasting copies of themselves without perm<strong>is</strong>sion.<br />

Because they do not require user intervention to reproduce, worms reproduce at an alarming rate.<br />

Examples of worms include Scalper, SoBig, and Swen.


ADWARE AND SPYWARE<br />

Adware and Spyware are cousins to trojans, worms, and <strong>virus</strong>es. These programs lurk on your<br />

machine. Adware and spyware are designed to observe your Internet habits and then pummel you<br />

with advert<strong>is</strong>ing, or to report back to their owners via secret messages. Sometimes, these products<br />

will even use your hard drive to store and broadcast pornography and advert<strong>is</strong>ing back to the Internet.


These semantics and definitions of <strong>virus</strong>es/malware can be very obscure to the non-technical user.<br />

However, it <strong>is</strong>n't crucial to d<strong>is</strong>tingu<strong>is</strong>h between these products technically. What <strong>is</strong> important <strong>is</strong> how you<br />

consciously defend against these malware infections.


Thanks for watching<br />

For more details v<strong>is</strong>it: www.norton.com/setup

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