Computer Virus

COMPUTER VIRUS

A C omputer Virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. What is a Computer Virus ?

How are viruses spread ? A virus can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or the Internet, or by carrying it on a removable medium such as a floppy disk, CD, or USB drive.

TYPES OF VIRUSES On the basis of scale there are five types of viruses under one name: MALWARE Spyware Adware Worms Trojans Rootkits

MALWARE Malware , from the words mal icious and soft ware , is a software designed to infiltrate or damage a computer system without the owner's informed consent. It includes spyware, adware, computer worms and trojan horses.

SPYWARE Spyware is computer software that is installed secretly on a personal computer to intercept or take partial control over the user's interaction with the computer, without the user's informed consent.

ADWARE Adware or advertising-supported software is any software package which automatically plays, displays, or downloads advertisements to a computer after the software is installed on it or while the application is being used.

COMPUTER WORMS A Computer Worm is a self-replicating computer program. It uses a network to send copies of itself to other nodes (computer terminals on the network) and it may do so without any user intervention. It always cause harm to the network, if only by consuming bandwidth.

TROJAN HORSES A Trojan , is malware that appears to perform a desirable function but in fact performs undisclosed malicious functions.

ROOTKITS A Rootkit is a computer virus which consists of a program designed to take fundamental control of a computer system, without authorization by the system's owners and legitimate managers.

ANTI - VIRUS

Anti-Virus Software are computer programs that attempt to identify, neutralize or eliminate malicious software. Most modern antivirus software is now designed to combat a wide range of threats, including worms, rootkits, Trojans, often described collectively as malware.

How does an Anti-Virus work ? There are two common methods that an anti-virus software application uses to detect viruses:
The first, and by far the most common method of virus detection is using a list of virus signature definitions.
The second method is to use a heuristic algorithm to find viruses based on common behaviors.

VIRUS REMOVAL One possibility on Windows Me , Windows XP and Windows Vista is a tool known as System Restore , which restores the registry and critical system files to a previous checkpoint.

Manual Prevention from Viruses
Delete your browsing history, temporary internet files, internet cookies before exiting .
Always remember to scan any removable hardware using anti-virus software before accessing it. Removable hardware includes Floppy Disks, CD, USB Drive.
Update your anti-virus for new and latest virus definitions.
Scan your computer every week using anti-virus software like Norton, McAfee for prevention against malware.
Create a system restore point before installing any software or freeware.

PREVENTION IS BETTER THAN CURE

BIBLIOGRAPHY www.google.co.in www.wikipedia.org www.ask.com www.cuil.com Computer Viruses (Second Edition)- Wayne Summers

CREDITS SHUBHASHISH PUNJ BILL GATES

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Computer Virus

by Shubhashish Punj

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