COMPUTER VIRUS

COMPUTER VIRUS
AND ITS TYPES

COMPUTER
VIRUS
Computer virus is a software program written with malicious intentions. There are number of computer viruses that can impede the functioning of your computer system.

DETAIL ABOUT
COMPUTER VIRUS

They are replicated by themselves. Viruses are so dangerous and malicious that they can be automatically copied and pasted from memory to memory over and over; the transmitting power is too much quick from network to network that can simply hang smoothly running computer, sometimes damage the important programs of the computer. Viruses are very dangerous program can go on their activities automatically and can do a great loss of the users. TYPES OF COMPUTER VIRUS
Memory Resident Virus
 Direct Action Virus
 Overwrite Viruses
 Boot Sector Virus
 Macro Virus
 Directory virus
 Polyphormic Virus
 Companion Virus
 FAT Virus
 Multipartite Virus
 Web Scripting Virus
 Worms
 File Infector Virus


Memory Resident
These viruses fix themselves in the computer memory and get activated whenever the OS runs and infects all the files that are then opened.
 Hideout: This type of virus hides in the RAM and stays there even after the malicious code is executed. It gets control over the system memory and allocate memory blocks through which it runs its own code, and executes the code when any function is executed.
 Target: It can corrupt files and programs that are opened, closed, copied, renamed, etc.
 Examples: Randex, CMJ, Meve, and MrKlunky
 Protection: Install an antivirus program.


Direct Action Virus


The main purpose of this virus is to replicate and take action when it is executed. When a specific condition is met, the virus will go into action and infect files in the directory or folder that are specified in the AUTOEXEC.BAT file path. This batch file is always located in the root directory of the hard disk and carries out certain operations when the computer is booted.

FindFirst/FindNext technique is used