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Type of Viruses
Kiriman  WhiteHatHacker_frenlyhacker WhiteHatHacker_frenlyhacker Kirimanpada  29-12-2006 00:42 29-12-2006 00:42 879  Baca 879 Baca  0 Komen 0 Komen
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There are two major categories of viruses:

Boot Sector Viruses

Boot sector viruses infect the boot sector of a disk, therefore affecting the computer system during the start-up process. The boot sector is a small area on a disk which is read by the computer when it is turned on (booted). The most common way for a system to become infected is when an infected disk is left in the disk drive when the computer is being booted. The computer will read the virus from the boot sector and infect the entire system. These viruses are difficult to deal with because they are read during the start-up process even before the system is able to load its antivirus software to detect the virus.



File Infector Viruses

File infector viruses affect the program files that a system must load in order to make software function. The virus infects a file (usually files ending in ".COM" or ".EXE") by overwriting part of the program. By overwriting the program the virus replaces part of the program code with viral code. When the program is executed, the virus code is executed and it infects more files.




Here are some other types of viruses:


Memory Resident Viruses
These viruses hide in memory and are difficult to detect. When the virus is in memory it will infect any uninfected file that is executed. The only way to remove the virus is to turn the power of the infected computer off.



Non-memory Resident Viruses

These viruses infect files and are executed each time the infected file is executed. However, they do not reside in memory.



Multi-partite Viruses

Multi-partite viruses have characteristics of the boot strap virus and the file infector virus. They can infect .COM and .EXE files as well as the boot sector of diskettes and hard drives.



Stealth Viruses

Stealth viruses hide the changes that they've made in files or boot records so that antiviral programs can't detect them through these changes.



Polymorphic Viruses

Polymorphic viruses scramble their code each time they replicate so that none of its copies are the same. This makes it difficult for virus scanners to detect it because scanners search for a particular code.
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