Computer Viruses

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UNIVERSITY OF SARGODHA, MANDI-BAHAUDDIN CAMPUS

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Computer Viruses

  1. 1. UOS.MBD
  2. 2. What is a Computer Virus ? Computer virus refers to a program which damages computer systems and destroys or erases data files
  3. 3. Who creates/writes viruses ? NFO ATTACKERS
  4. 4. Why people creates computer viruses?  To attack the products of specific companies.  To theft the confidential info.  To distribute political messages.
  5. 5. Virus codes can be written…… By using Assembly languages like Basic, c, Pascal e.t.c
  6. 6. What will happen if your computer Inf ected by virus  Functions slower than normal R esponds slowly and f reezes of ten R estarts itself of ten  See uncommon error messages, distorted menus, and dialog boxes
  7. 7. Major Types of Viruses Virus Boot Boot Sector Sector Virus Virus Program/ Program/ File File Infector Infector Trojan Trojan Horses Horses Worms Worms Macro Macro Viruses Viruses Root Kit Root Kit
  8. 8. Boot Sector Virus The boot virus affects the booting process of the infected computer system. thus causing slow start up and shut down process
  9. 9. Program/ File Infector Becomes active when the virus program file carrying the virus is opened. usually with below extensions .BIN .COM .EXE .OVL .DRV
  10. 10. Trojan Horses Appears as interesting program file but when installed it allows intruders to access and read your files
  11. 11. Worms Copies and multiplies it self by using computer networks and security flaws
  12. 12. Macro Virus Programmed as a macro embedded in a document, usually found in Microsoft Word and Excel.
  13. 13. RootKit Designed to take fundamental control of a computer system, without authorization by the system's owners
  14. 14. Sources of Viruses  Internet  Removable Data Storage Devises
  15. 15. Virus Prevention
  16. 16. Anti-Virus
  17. 17. How does an Anti-Virus work ? Scanner: Detects the virus by using a list of existing virus signature/definitions. Monitors: These are memory resident programs and alert when any changes find in executable program.
  18. 18. Conclusion Prevention is Better than Cure
  19. 19. Thank you

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