Meaning :
computer virus is a destructive computer program that replicates itself
causing loss of data and program. It is developed by computer programmer using
Assembly or low level language. Eg. Cbrain, Time bomb, June 12, etc.
Features:
(i)
Self- replicating
(ii)
Quick transmitting
(iii)
Destructive
Purpose of creating Virus :
(i)
To Percocet software from piracy
(ii)
To delete , steal and damage data and program
(iii)
To entertain user
(iv)
To earn money with bad intention
Types of Computer virus :
(i)
Boot sector virus:
Infects boot sector of a disk.
(ii)
Application infector/ File virus: The virus which infects the file having
extension .com. .exe. .drv etc is known as file virus.
(iii)
Dos System infector : The virus which infects the
system files of MS–DOS( IO.sys, MSDOS.sys. COMMAND. com) is known as DOS system
infector.
(iv)
Macro virus: Infects MS- word and Excel document
template .
(v)
Script virus: Infects Html and java scripting language.
Symptoms/ Indication of virus infection :
(i)
Computer takes long time to boot.
(ii)
Computer becomes hang and slow down, all of sudden
(iii)
Size of file is changed, all of sudden.
(iv)
Data and files are deleted or automatically copied.
(v)
Disk drives are accessed without selection
Methods/ Modes of virus transmission/ infiltration:
(i) By using pirated
software.
(ii) By using virus infected disks and games.
(iii) By down loading unknowns site and mail.
Safety from the computer virus :
(i) Do not down load or copy any program from internet,
without confirmation of virus free.
(ii) Do not use virus infected disk or media without
scanning.
(iii) Always use updated & latest antivirus program.
( iv) Keep back up of important data & program.
Antivirus program : A
software that scans , detect and remove virus from program or computer system
is known as antivirus program. The process of detecting and removing virus is
called virus scanning Exampes;
SCAN, CLEAN, MSAV, CPAV, AVG
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