Virus slides
- 1. virus Prepared by:- Rauhl kundu 6th sem,IT
- 2. Content Definition of virus Types of virus
- 3. Definition of virus A computer virus is a program or piece of code that is loaded onto your computer without your knowledge & runs against your wishes. Viruses can also replicate themselves. All computer viruses are man-made.
- 5. Type of viruses 1. File infector virus 2. Boot sector virus 3. Master boot record virus 4. Multi-partite virus 5. Macro virus 6. Script virus 7. Companion virus
- 6. 1) File infector virus It infects files with .exe or .com extensions. When the infected file is accessed or executed, it may be partially or completely overwritten by the virus.
- 7. 1) File infector virus A file infecting virus may be known as a file infector. After memory is infected, any non- infected executed that runs becomes infected. E.g.:- Jerusalem & cascade.
- 8. 2) Boot sector virus It is a computer virus that infects a storage devices floppy/MBR. A boot sector virus is able to infect a computer only if the virus is used to boot up the computer. E.g.-disk killer, stoned, michelangelo
- 9. 3) Master Boot record virus Similar to boot sector virus. An MBR virus is common type of virus that replaces the MBR with it own code. A small program that is executed when a computer boots up. E.g.-NYB, AntiExe, unashaned
- 10. 4) Multi-partite virus Infect boot records and programs files. Difficult to repair. Boot area & files must both be cleaned of virus or re-infection will occur. E.g.-one half, emperor, anthrax, tequila
- 11. 5) Macro virus Most common type of virus. Infect data files like word, excel, power presentation, access files. E.g.-W97m.melissa, WM.NiceDay & W97M.groov
- 12. 6) Script virus Infect various script language such as dos, java script & visual basic script.
- 13. 7) companion virus A virus which infects executable files by creating a ‘companion’ file with the same name but an .com extension.
- 14. Thank you