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presentation on computer virus


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presentation on computer virus

  1. 1. CONTENTS INTRODUCTION. 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.
  2. 2. 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. OR A 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.
  3. 3. Similarities between biological virus and computer virus: Computer virus are called viruses because they share some of the traits of biological Viruses. A computer virus passed from computer to computer like a biological virus Passes from person to person • Need a host for residence. • Capable of self-replicate. • Cause damage to host.
  4. 4. 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?
  5. 5. 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
  8. 8. 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.
  9. 9. BOOT SECTOR VIRUS A 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
  10. 10. WORMS A worm is also a destructive program that fills a computer system with self- replicating information. Types of WORMS VIRUS: MAIL WORM PURE WORM
  11. 11. TROJAN HORSE Trojan Horse is a destructive program. It usually pretends as computer games or application software. If executed, computer system will be damaged.
  12. 12. LOGICAL BOMBS A logical bomb is a destructive program that performs an activity when a certain action has occurred.
  13. 13. OTHERS Time Bomb Script Virus Directory Virus
  14. 14. Signature-Based Detection-Compare the contents of a file to a dictionary of virus.
  15. 15. Behavior -Based Detection: Observe how the program execute in the computer Rather than looking for signature . Check the suspicious file and show warnings to the user.
  16. 16. Heuristic -Based Detection:  Detect and remove all threats.  Create a generic signature.
  17. 17. PREVENTION  Don'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
  18. 18. ANY QUESTION
  19. 19. THANK YOU