Computer Virus Class 10 Computer Science Chapter 3
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| Computer Virus |
Introduction
A computer virus is a man-made harmful computer program that affects the normal functioning of a computer system. Computer viruses can transfer from different means to a computer without the knowledge and permission of the user. Computer viruses have the ability to replicate their source code and they can hide in other files. computer virus executed when such files are used for or executed.
Purpose of creating a virus
To steal data and information
To destroy data information and files
To earn money e
To expose programming ability
Modes of virus transmission
Sharing of infected external storage describe pen drive CD DVD
Using pirated software
Downloading the files from unknown websites
Exchanging of data and information over the network
Opening virus-infected email messages
Effects of computer virus
Destroy data information and programs
Reduce overall performance of computer
Makes computer hang
Delete or remove files permanently
Change the size of files
Spreads from one computer to another
Symptoms of computer virus
The program takes more time to load or fails to load
Irritating messages come on screen suddenly
Computer becomes slow
The program opens automatically without giving instructions
Missing files or mismatch of files
The computer gets shut down unexpectedly
Types of computer viruses
Boot sector virus
It is a startup infector virus that infects the bootstrap loader. The bootstrap loader and the file information are stored on the boot sector of a disk. When the computer is started this virus loads its source code first and takes control of the computer system. The boot sector virus affects the operating system of computers. Example: C- Brain, Disk Killer, etc
File infector virus or parasitic virus
These viruses infect executable files or programs. The files having extensions such as .exe, .sys, .com are executable files or program files that are infected by file infector virus. Example: Ambulance virus, Die Heart, etc.
Multipartite virus
This virus has the ability of file infector as well as boot sector virus. It can infect both the boot sector and executable files. For example Ghostball, Invader, etc.
Macro virus or document infector virus
This virus infects specifically the document files created by Microsoft applications such as Word, Excel, PowerPoint, etc. So it is also called the document infector virus. Example: Love letter, Melissa, etc.
Script virus
This virus infects script programming languages such as JavaScript, VB script. This virus can transfer through emails and by downloading files from web pages. Example: ILOVEYOU, HTML.Redlof. A, etc.
WORMS
It is a malicious computer program that replicates but does not hide itself in other files. It is similar to computer viruses and can cause negative effects too. Example: PSW Bugbear, Mapson, etc.
Trojan horse
It is a destructive program that does not replicate, however, it can harm the computer system by providing remote access to someone else.
Antivirus
An antivirus is a useful computer program that detects and removes viruses from the computer system. It is a utility program that protects computer hardware and software from being damaged due to viruses. Example: Quick Heal, Kaspersky, AVG(Anti Virus Guard), Norton, etc.
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| Antivirus |
Real-time protection of computer
Detect computer virus
Scan computer's hard drive to ensure virus free
Scan portable and removable media like pen drive CD DVD etc
Methods of protection from computer viruses
Install Powerful antivirus
Update antivirus software timely
Do not use pirated software
Do not download files from the internet and unknown sites.
Scan external media like pen drive CD DVD before using it
Do not open unknown emails
Use a strong password to protect from unauthorized access by others
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