Virus of Computer

Briefly explain about virus (with example) and find out the latest antivirus in market :  

• A computer virus is a computer program that can replicate itself  and spread from one computer to another. The term "virus" is also commonly, but erroneously used, to refer to other types of malware, including but not limited to adware and spyware programs that do not have a reproductive ability.
  Viruses can increase their chances of spreading to other computers by infecting files on a nrtwork file system or a file system that is accessed by other computers.As stated above, the term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, even those that do not have the ability to replicate themselves. Malware includes computer viruses, computer worms, Trojan horses, most rootkits, spyware, dishonest adware and other malicious or unwanted software, including true viruses. Viruses are sometimes confused with worms and Trojan horses, which are technically different. A worm can exploit security vulnerabilities to spread itself automatically to other computers through networks, while a Trojan horse is a program that appears harmless but hides malicious functions. Worms and Trojan horses, like viruses, may harm a computer system's data or performance.

         

                      

The type of computer virus :

Boot Sector - Occupying part of the hard disk or diskette in the main boot record (MBR). It will silence his to it is switched on by the programe.

TABLE partition - It is similar to boot sector virus, but it attacks "partition table" hard drive (space to store the information how to reach the hard drive) by moving it to new sectors and replace the existing with the virus-infected code. The virus will spread from the partition table to disk if the disk boot sector is used.

FILE VIRUS - Viruses of this type are commonly available memory resident virus files. This virus will merge itself into the file. Exe and it will prevent the file from working. It can also modify and damage files facilitate the spread before it is detected. Among the viruses that are included in this category are polymorphic virus (constantly changing) and stealth viruses (not affected).

 Multipartite viruses Multipartite - It has features similar to boot sector viruses and file viruses. It is attached to the file and modify the hard disk MBR. It requires this kind of coding kompleks.Virus rare but it can perform actions that destroy.

MACRO VIRUS - Viruses of this type are new and first appeared in July 1995 in MS WORD. By indirect application files using Word, Excel and other applications that use macros. It can produce network command in a command file that performed each time a key combination pressed. There are macro viruses also damage and destroy other files.

Trojan Horse - The virus is not replicating itself so it is often considered not entirely virus but it still managed to produce a great corruption. It is often included in the new program or valid because it is often used by consumers. Apabile it is switched on it will display a message, change or destroy a lot of data files.

Worms - This virus is also not a full virus because it does not infect other files but it replicates itself rapidly. Each time it is generating a lot of issues copies. The result worms in a short time and eat hard drive space. It is spread through a network or e-mail and meet the network storage space or email storage.

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