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Computer virus


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  • 1. University of Salahaddin /Hawler, College of Science/Computer DepartmentSupervisorDr.sarahPrepared byHemn amin
  • 2. Virus is a computer program that can copyitself and infect computer withoutpermission or knowledge of the user. A viruscan only spread from one computer toanother when its host is taken to theuninfected computer, for instance by a usersending it over a network or the Internet, orby carrying it on a removable medium suchas a floppy disk, CD, or USB drive.
  • 3. Going back to the origin of viruses, it was in1949 that Mathematician John Von Neumanndescribed self-replicating programs which couldresemble computer viruses as they are knowntoday. In that decade, a group of programmersdeveloped a game called Core Wars, whichcould reproduce every time it was run, and evensaturate the memory of other playerscomputers. The creators of this peculiar gamealso created the first antivirus, an applicationnamed Reaper, which could destroy copiescreated by Core Wars.
  • 4. The term Malware is derived from two differentwords - "malicious" and "software.Indeed, Malware is a general term for any kind ofprogram that is designed to harm your computer.Adware, Spyware, Trojans, Viruses and trackingcookies are all types of Malware.
  • 5.  Virus A Computer Virus is that it attaches itself to a legitimate program or file to perform its damage. Viruses can copy themselves and spread quickly. Trojans A Trojan is a type of malware that appears utterly innocuous; many times, In the worst case scenario, a Trojan can create a "backdoor" on your PC that a hacker can use to get into your system. though, Trojans cannot replicate or duplicate themselves.
  • 6.  Worms A Worm is also a type of computer Malware. As such it can replicate itself with ease. though, is that they can do so without human assistance. Worms travel across computer networks . They suck up a lot of system memory and are known to crash entire networks.
  • 7.  Spyware Spyware is a kind of malware; it has a specific objective, though: Running in the background to gather information from your computer system. Needless to say, spyware isnt something that you want running on your computer. Adware Adware is a word formed from combining "Advertising" and "Software." In essence Adware is advertising-supported software. Adware is more annoying than harmful on its own.
  • 8.  They are transmitted through computer networks, the Internet and portable media like USB drives, DVDs and CDs. You can receive computer viruses via email or by copying a program onto a CD and installing it onto your PC.
  • 9.  Applications that dont work properly. Disks cant be accessed. Printing doesnt work correctly. File size changes for no apparent reason. Date of last access does not match date of last use. An increase in the number of files on the system when nothing has been added Unusual error messages. System slows down, freezes or crashes.
  • 10.  Best way to protect yourself is to prepare your computer anti viruses in advance. One way to protect you computer is to use updated anti-virus program.
  • 11. Antivirus programs were initially introducedin the mid-1980s and became popular in1988. During this time, many computerhackers released viruses.
  • 12. Significance of Anti-virusAntivirus software protects your computer fromharmful software.Function of Anti-virus Quarantine Prevention Repair or Removal
  • 13. Types of Anti-virus Anti-virus Anti-virus Internet securityAnti-virus Update Viruses can change and become undetected by certain programs. This can be prevented by updating the virus definitions offered by the software company.
  • 14.  BitDefender Antivirus 2012 Norton Antivirus 2012 Perfect Antivirus 2012 Vipre Antivirus 2012 ESET Antivirus 2012 Kaspersky Antivirus 2012 F-Secure Antivirus 2012 TrendMicro Antivirus 2012 ZoneAlarm Antivirus 2012 Panda Antivirus 2012