What is a computer virus :

virtual issues August 08, 2020

What is a computer virus?

A Computer Virus is a computer program that can copy itself and infect a computer without the permission or knowledge of the user.

 

How do viruses spread?  

A Computer Virus is a computer program that can copy itself and infect a computer without the permission or knowledge of the user.

       

 Types of viruses:->

  • Spyware

  • Adware

  • Worms

  • Trojans

  • Rootkits 

 

VIRUSES: WHAT THEY INFECT?
1. System Sector Viruses -DOS boot sector or the Master Boot Record
2. File Viruses -Program (COM and EXE) files
3. Macro Viruses -Data files having macro programs
4. Companion Viruses -EXE files by installing a same-named COM file
5. Cluster Viruses -Changes the DOS directory information so that directory entries  point to the virus code instead of the actual program
6. Source Code Viruses -Source code,  by adding Trojan code to it

 

 

Malware :

  • Malware from the words malicious and software, is a software designed to infiltrate or damage a computer system without the owner's informed consent. It includes spyware, adware, computer worms, and trojan horses.



Spyware :

  • Spyware is computer software that is installed secretly on a personal computer to intercept or take partial control over the user's interaction with the computer, without the user's informed consent.

Adware or advertising-supported software :

  • Adware or advertising-supported software is any software package which automatically plays, displays, or downloads advertisements to a computer after the software is installed on it or while the application is being used.


 

Computer Worm :

  • A Computer Worm is a self-replicating computer program. It uses a network to send copies of itself to other nodes (computer terminals on the network) and it may do so without any user intervention. It always causes harm to the network, if only by consuming bandwidth.

 

 

 

 

 Trojan :

  • A Trojan is a malware that appears to perform a desirable function but in fact, performs undisclosed malicious functions.


Rootkit

  • A Rootkit is a computer virus which consists of a program designed to take fundamental control of a computer system, without authorization by the system's owners and legitimate managers.


    Signs of viruses: 

    • The Operating System may slow down. 

    • Change the length of executable (*.com/*.exe)  files. 

    •  Showing some funny and suspicious behavior (blinking of the mouse).


NOTE : Use Anti-virus in your laptops, computers anti-virus is very important for your systems. without anti-virus if you are using your computer then you are computer will attacked by Exploiters, malwares, trojans, trackers,etc..... Don't use trail versions please try to use paid antivirus only.






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