Date post: | 07-May-2015 |
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UOS.MBD
What is a Computer Virus ?
Computer virus refers to a program which damages computer systems and destroys or erases data files
Who creates/writes viruses ?
INFO ATTACKERS
Why people creates computer viruses?
To attack the products of specific companies.
To theft the confidential info. To distribute political messages.
Virus codes can be written…… By using
Assembly languages like Basic, c,Pascal e.t.c
What will happen if your computer
Infected by virusFunctions slower than
normalResponds slowly and
freezes oftenRestarts itself oftenSee uncommon error
messages, distorted menus, and dialog boxes
Notice applications fail to work correctly
Fail to print correctly
MajorTypes of Viruses
Virus
Boot Sector Virus
Boot Sector Virus
Program/File
Infector
Program/File
Infector
TrojanHorsesTrojanHorses WormsWorms Macro
VirusesMacro Viruses Root KitRoot Kit
The boot virus affects the
booting process of the
infected computer system.
thus causing slow start up
and shut down process
Boot Sector Virus
Program/File Infector virus
Becomes active when the
program file carrying the
virus is opened.
usually with below extensions
.BIN .COM
.EXE .OVL
.DRV
Appears as interesting
program file but when
installed it allows
intruders to access and
read your files
Trojan Horses
Copies and multiplies it
self by using computer
networks and security
flaws
Worms
Programmed as a macro
embedded in
a document, usually
found in Microsoft Word
and Excel.
Macro Virus
Designed to take
fundamental control of
a computer system,
without authorization by
the system's owners
RootKit
Sources of Viruses
Removable Data Storage Devises
Internet
Virus Prevention
Anti-Virus
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.
Better than
Conclusion
Prevention is
Cure
Thank you