what is a virus ? what are its types
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computer virus is a piece of software that can 'infect' a computer, install itself and copy itself to other computers, without the users knowledge or permission. It usually attaches itself to other computer programs, data files, or the boot sector of a Hard drive.
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computer virus is a type of malicious code or program written to alter the way a computer operates and is designed to spread from one computer to another. A virus operates by inserting or attaching itself to a legitimate program or document that supports macros in order to execute its code. In the process, a virus has the potential to cause unexpected or damaging effects, such as harming the system software by corrupting or destroying data.
types of computer viruses?
1. Boot sector virus
This type of virus can take control when you start — or boot — your computer. One way it can spread is by plugging an infected USB drive into your computer.
2. Web scripting virus
This type of virus exploits the code of web browsers and web pages. If you access such a web page, the virus can infect your computer.
3. Browser hijacker
This type of virus “hijacks” certain web browser functions, and you may be automatically directed to an unintended website.
4. Resident virus
This is a general term for any virus that inserts itself in a computer system’s memory. A resident virus can execute anytime when an operating system loads.
5. Direct action virus
This type of virus comes into action when you execute a file containing a virus. Otherwise, it remains dormant.
6. Polymorphic virus
A polymorphic virus changes its code each time an infected file is executed. It does this to evade antivirus programs.
7. File infector virus
This common virus inserts malicious code into executable files — files used to perform certain functions or operations on a system.
8. Multipartite virus
This kind of virus infects and spreads in multiple ways. It can infect both program files and system sectors.
9. Macro virus
Macro viruses are written in the same macro language used for software applications. Such viruses spread when you open an infected document, often through email attachments
types of computer viruses?
1. Boot sector virus
This type of virus can take control when you start — or boot — your computer. One way it can spread is by plugging an infected USB drive into your computer.
2. Web scripting virus
This type of virus exploits the code of web browsers and web pages. If you access such a web page, the virus can infect your computer.
3. Browser hijacker
This type of virus “hijacks” certain web browser functions, and you may be automatically directed to an unintended website.
4. Resident virus
This is a general term for any virus that inserts itself in a computer system’s memory. A resident virus can execute anytime when an operating system loads.
5. Direct action virus
This type of virus comes into action when you execute a file containing a virus. Otherwise, it remains dormant.
6. Polymorphic virus
A polymorphic virus changes its code each time an infected file is executed. It does this to evade antivirus programs.
7. File infector virus
This common virus inserts malicious code into executable files — files used to perform certain functions or operations on a system.
8. Multipartite virus
This kind of virus infects and spreads in multiple ways. It can infect both program files and system sectors.
9. Macro virus
Macro viruses are written in the same macro language used for software applications. Such viruses spread when you open an infected document, often through email attachments
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