WHAT IS VIRUS ?
A Virus is a program created by programmers which is used to infect the Operating System.
After the virus code is written, it is buried within an existing program and once that program is loaded into the computer, the virus replicates by attaching copies of itself to other programs in the system. Viruses are merely found in the network environment.
Virus is just like that illness for a computer.Think that what happen when you are ill, that your body functions are not working properly.As same Computer Virus is also do the same things with it.
The term 'computer virus' was first formally defined by Fred Cohen in 1983. They are always induced by people. Once created and released, however their diffusion is not directly under human control.
After entering a computer, a virus attaches itself to another programs in such a way that
execution of the host program triggers the action of the virus simultaneously. It can self-replicate,inserting itself onto other program or file, infecting them in the process.
Not all computer viruses are destructive though.
The term 'computer virus' was first formally defined by Fred Cohen in 1983. They are always induced by people. Once created and released, however their diffusion is not directly under human control.
After entering a computer, a virus attaches itself to another programs in such a way that
execution of the host program triggers the action of the virus simultaneously. It can self-replicate,inserting itself onto other program or file, infecting them in the process.
Not all computer viruses are destructive though.
Viruses spread when the software or documents they get attached to are transferred from one
computer to another using a network, a disk file sharing methods or through infected e-mail attachment.
computer to another using a network, a disk file sharing methods or through infected e-mail attachment.
For the Prevention of Virus we have to use Anti Viruses.
Viruses are Available of many types. Here we share some name of Viruses :-
1.Trojan Horse
2.Mailer
3.Mass Mailer
4.Worm
5.Back Door
6.Blended Threat
7.Adware
8.Ransomeware
9.Spyware
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WORM VIRUS |
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ADWARE |
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SPYWARE |
The following lists some of the symptoms of a virus attack. If you detect these symptoms on your PC, you should suspect virus infection.
1.You receive an e-mail with an odd attachment and opened it with unexpected results, such as the appearance of odd dialog boxes or a sudden degradation in system performance.
2.An antivirus program will not install on the PC but other program will.
3.Odd dialog boxes or messages appear on the screen frequently or occasionally.
4.Several files are missing, especially those of a common type For example ,some viruses delete all graphic files of a particular types.
5.You notice the presence of new users with full security permission that you know you did not create or you notice inappropriate permissions assigned to existing users.
6.The mouse pointer changes to some different graphic on its own.
7.Odd Icons appears on the desktop although you did not place them there or you have not installed any new applications lately.
8.Strange sounds or music plays from the speaker for no apparent reason.
9.Files sizes or date / time stamps have changed on files that you know you did not alter.
10.Your PC start performing actions on its own, like moving the mouse pointer, opening and closing windows, running programs, opening & closing CD tray.
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