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Working of a virus.

Virus is a computer program that has the ability to destroy files or damage a computer system.

Viruses have many different types and has a way of working is different,

The following types of viruses and how to work each virus:

1. Virus File
This virus has infected the workings of the application or any documents in your computer. When an infected application is run, the virus will spread in a way infect all files or documents that are accessed by the application.

2. Boot Sector Virus
These viruses have a way of working that is infecting the hard disk boot sector (boot sector is an area in the hard drive is accessed when the computer is first turned on). If a boot sector virus is active, users will not be able to boot the computer normally.

3. E-mail Viruses
These viruses have a way of working that is spread through e-mail (usually in the form of attached files / attachments). Viruses of this type has the special characteristic of the extension. Scr,. Exe,. Pif, or. Bat.
If the virus is active, then he will send itself to a variety of e-mail addresses contained in the user’s address book.

4. Multipartite Virus
These viruses have a way of working that infects computer files on the hard disk boot sector as well.
This type of virus will cause many problems because it causes fatal damage.

5. Polymorphic viruses
This virus has a unique way of working that this virus can change the code itself (change form) while spreading itself to other computers. The virus is more difficult to detect because it has a nature / ability like that.

6. Virus Stealth 
These viruses have a way of working that he was able to hide himself by making an infected file as if the file is not infected.

7. Macro Viruses
These viruses have a way of working that infects Microsoft Office applications, like Word and Excel.

Documents are usually infected by Macro viruses will modify the existing command in Microsoft Office as the “Save” to spread itself when the command is executed.

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