INTRODUCTION

Submitted By :- Neeraj Kumar Singh

Branch :Electronics&communication

Topic : computer Viruses

Submitted to :- Ms. Veena Gupta

COMPUTER VIRUSES

A Computer Virus is a program that may disturb the normal working of a computer.

CHARACTERISTICS OF A COMPUTER VIRUS:

the ability to replicate itself. the ability to attach itself to another

computer file.

WHAT IS A COMPUTER VIRUS?

The term "computer virus" is often

used incorrectly as a catch-all phrase to include all types of Malware such as Computer Worms, Spyware, Adware, and Root kits - all of which are slightly different than Computer Viruses. 

WRONG USE OF TERM COMPUTER VIRUS

A Computer Virus needs another program in order to be able to be activated and infect other computers files.

For example, a virus might attach itself to a spreadsheet program. Each time the program runs, the virus runs too.

A file containing virus is called infested file.

WORKING OF COMPUTER VIRUS

Boot viruses Affects boot sector of a floppy or hard disk. Program viruses Infect executable program files. Multipartite viruses A hybrid of Boot and Program viruses. Directory Virus

Directory viruses change the paths that indicate the location of a file

TYPES OF COMPUTER VIRUSES

Stealth viruses Use certain techniques to avoid detection. Macro Viruses Infects the macros within a document or

template. Polymorphic viruses Encrypt its code in different ways Metamorphic viruses  Rewrite themselves each time they infect a new file.

TYPES OF COMPUTER VIRUSES

Format hard disk Copy, rename and dlete files Modify files dates and extensions Display false message every few times Damage data Damage software

WHAT CAN VIRUSES DO?

Computer runs slowly Random restarts Unknown and uninstalled icons on desktop Icons change in appearance System memory and disk space is reduced New windows open up at an alarming rate Error messages on regular basis Files mysteriously disappear

SYMPTOMS

Email Opening and downloading an email

containing virus Networks Connecting with network that contains virus Removable Storage Media Floppy discs, CDs and flash devices Pirated Software Installing pirated software that contains virus

HOW VIRUS SPREADS?

Common people: For fun Release anger Take revenge For fameProfit earners: Antivirus marketInfo attackers: Disrupt enemy’s information and network

WHOCREATES VIRUSES AND WHY?

Latest antivirus should be installed Antivirus software must be upgraded

regularly Unknown emails should not be opened Unauthorized software should not be

installed Removable storage media should be

scanned Freeware and shareware software from

internet should be checked before installing

HOW TO PROTECT FROM VRUS?

BibliographyThe following information has been taken from :www.wikipedia.comwww.ask.comwww.yahoo.comwww.google.com

Thank You, Neeraj.