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Virus soran university
1. UNIVERSITY OF SORAN
Faculty of science & engineering
School of engineering
DPT of petroleum engineering
VIRUS
Prepared by:
Harem Abdullstar
Rebaz Abdullqadr
Omer Muhammed
Supervisor :
Mr. Aras Masoud
2. Contents?
what's a computer virus ?
Types of Viruses
Categories of Viruses
How do viruses work?
How an Antivirus works?
Conclusion
3. What is a virus?
A computer virus is a computer program that
can copy itself and infect a computer without
permission or knowledge of the user.
The computer viruses can damage or
corrupt data, modify existing data .
5. 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.
E.g. Form, Disk
Killer, Michelangelo, Stoned.
6. Master Boot Record virus (MBR)
MBR viruses are memory-resident viruses
that infect disks in the same manner as
boot sector viruses.
E.g. AntiEXE, Unashamed, NYB
7. File infector virus
File infector viruses infect program files.
Normally infect executable code, such as
.COM, .SYS, .BAT and .EXE files.
E.g. Snow.A, Jerusalem, Cascade
8. Multipartite virus
A multipartite virus is a virus that can infect either
boot sectors or executables.
When it infects a boot sector, it works as a boot
sector infector.
E.g. One_Half, Emperor, Anthrax, Tequilla.
9. Macro Virus
Macro viruses infect files that are created using
certain applications or programs that contain
macros.
They infect documents created from Microsoft
Office Word, Excel, PowerPoint and Access files.
E.g.W97M.Melissa, Bablas, WM.NiceDay, W97M.
Groov.
10. Trojan Horse
A Trojan horse is a computer program that is
hiding a virus or other potentially damaging
program.
Trojan horses can be included in software that
you download for free or as attachments in
email messages.
E.g. Trojan.Vundo. Back
Orifice, NetBus, SubSeven
11. Worms
A computer worm is a self-replicating computer
program. It uses a network to send copies of
itself to other and it may do so without any user
intervention.
Work of worms
delete files on a host system
send documents via email
E.g.W32.Mydoom.AX@mm
12. How do viruses work?
Replicating itself
Interrupting system/network use
Modifying configuration settings
Flashing BIOS
Format hard drive/destroy data
Using computer/network resources
13. How an Antivirus works?
The antivirus software examines each and every
file in a computer and examines its content with
the virus definitions stored in its virus dictionary.
E.g. Avira
Kaspersky
Norton
Many more ……………