PRESENTATION ON

COMPUTER VIRUS

SUBMITTED TO:Mr. ACHINTMs. SHIVANIC.S.E Department

SUBMITTED BY:YOGESH SINGH RAWATCSE 2ND YRRoll No.-120240101070

CONTENTSINTRODUCTION.Similarities B/w Biological & Computer Virus.How Does A Virus Work?Life Cycle Of Computer Virus.Functional Diagram of VIRUS.Types Of VIRUS.Methods Of Detecting Virus By ANTI-VIRUS.Prevention.

INTRODUCTION

COMPUTER VIRUS: A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and run against your wish.

ORA virus is illegal computer code that can do such things as alter programs or destroy data. Also, the virus can copy itself onto programs, thereby spreading its damaging effects.

Similarities between biological virus and computer virus:

Computer virus are called viruses because they share some of the traits of biologicalViruses. A computer virus passed from computer to computer like a biological virusPasses from person to person

• Need a host for residence.• Capable of self-replicate.• Cause damage to host.

How Does A VIRUS Spread? first the virus is linked to the host object in such

a way that it activates when the host object is used.

Second virus looks for other suitable carrier objects and attaches itself to them.

With this dependency virus slows down the system.

How does a virus work?

The virus waits until user transmits the infected object to another

computer

User transmits an infected object to another computer

The virus locates and infects suitable objects on the new computer

A typical lifecycle of a computer virus

VIRUS

ANTI- DETECTIN ROUTINES

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FUNCTIONAL DIAGRAM OF VIRUS:

TYPES OF VIRUSMACRO VIRUS.BOOT SECTOR VIRUS.WORMS.TROJEN HORSES.LOGIC BOMBS.

MACRO VIRUS:A macro virus is associated with application software like word and excel. When opening the infected document, macro virus is loaded into main memory and destroys the data stored in hard disk.

BOOT SECTOR VIRUSA boot sector virus infects boot sector of computers. During system boot, boot sector virus is loaded into main memory and destroys data stored in hard disk

WORMSA worm is also a destructive program that fills a computer system with self-replicating information.

Types of WORMS VIRUS: MAIL WORM PURE WORM

TROJAN HORSETrojan Horse is a destructive program. It usually pretends as computer games or application software. If executed, computer system will be damaged.

LOGICAL BOMBSA logical bomb is a destructive program that performs an activity when a certain action has occurred.

OTHERSTime BombScript VirusDirectory Virus

Signature-Based Detection-Compare the contents of a file to a dictionary of virus.

METHODS OF DETECTING THE VIRUS BY ANTI-VIRUS:

METHODS OF DETECTING THE VIRUS BY ANTI-VIRUS

Behavior -Based Detection:Observe how the program execute in the computerRather than looking for signature .

Check the suspicious file and show warnings to the user.

METHODS OF DETECTING THE VIRUS BY ANTI-VIRUSHeuristic -Based Detection:Detect and remove all threats.

Create a generic signature.

PREVENTIONDon't share Drive C: without a password

and without read-only restrictions.Use Anti-Virus.Delete e-mail file attachments.Have multiple backups of important files.

More secure operating systems e.g. UNIX

ANY QUESTION

THANK YOU

HAPPY AND SAFE COMPUTING....