Created by Dragon Lee May-2003
Computer Virus
What is computer virus?
Computer virus refers to a
program which damages computer
systems and/or destroys or erases
data f...
Features of Computer Virus
Types of Computer Virus
Time Bomb
Logical Bomb
Worm
Boot Sector Virus
Macros Virus
Trojan Horse
Script Virus
Time Bomb
A time bomb is a virus program
that performs an activity on a
particular date
Logical Bomb
A logical bomb is a destructive
program that performs an activity
when a certain action has occurred.
Worm Virus
A worm is also a destructive
program that fills a computer
system with self-replicating
information, clogging t...
Boot Sector Virus
A boot sector virus infects boot
sector of computers. During system
boot, boot sector virus is loaded
in...
Macro Virus
A macro virus is associated with
application software like word and
excel. When opening the infected
document,...
Script Virus
Commonly found script viruses are
written using the Visual Basic
Scripting edition (VBS) and the
JavaScript p...
Trojan Horse
Trojan Horse is a destructive
program. It usually pretends as
computer games or application
software. If exec...
Trojan Horse
Trojan Horse usually comes with
monitoring tools and key loggers
Actions to prevent virus infection
Always update your anti-virus
software at least weekly.
Back up your important files an...
Actions to prevent virus infection
Don't share Drive C: without a
password and without read-only
restrictions.
Empty flopp...
Actions to prevent virus infection
Forget opening unexpected e-mail
attachments, even if they're from
friends
Get trained ...
Actions to prevent virus infection
Install security updates for your
operating system and programs as
soon as possible.
Ju...
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Ascomputervirus

  1. 1. Created by Dragon Lee May-2003
  2. 2. Computer Virus
  3. 3. What is computer virus? Computer virus refers to a program which damages computer systems and/or destroys or erases data files
  4. 4. Features of Computer Virus
  5. 5. Types of Computer Virus Time Bomb Logical Bomb Worm Boot Sector Virus Macros Virus Trojan Horse Script Virus
  6. 6. Time Bomb A time bomb is a virus program that performs an activity on a particular date
  7. 7. Logical Bomb A logical bomb is a destructive program that performs an activity when a certain action has occurred.
  8. 8. Worm Virus A worm is also a destructive program that fills a computer system with self-replicating information, clogging the system so that its operations are slowed down or stopped
  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. 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
  11. 11. Script Virus Commonly found script viruses are written using the Visual Basic Scripting edition (VBS) and the JavaScript programming languages
  12. 12. Trojan Horse Trojan Horse is a destructive program. It usually pretends as computer games or application software. If executed, computer system will be damaged.
  13. 13. Trojan Horse Trojan Horse usually comes with monitoring tools and key loggers
  14. 14. Actions to prevent virus infection Always update your anti-virus software at least weekly. Back up your important files and ensure that they can be restored. Change the computer's boot sequence to always start the PC from its hard drive
  15. 15. Actions to prevent virus infection Don't share Drive C: without a password and without read-only restrictions. Empty floppy drives of diskettes before turning on computers, especially laptops.
  16. 16. Actions to prevent virus infection Forget opening unexpected e-mail attachments, even if they're from friends Get trained on your computer's anti-virus software and use it. Have multiple backups of important files. This lowers the chance that all are infected.
  17. 17. Actions to prevent virus infection Install security updates for your operating system and programs as soon as possible. Jump at the chance to learn more about your computer. This will help you spot viruses.
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