A free guide to 7 computer viruses you should know about

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Computer viruses are nasty little programs that are designed to lay waste to your computer. Some destroy files stored on your PC, while some trigger different software to malfunction. More nefarious viruses steal your confidential information and some even go to an extent to rig a system’s power load and cause it to catch fire. Some nasty little things these viruses are! So, the more you know about viruses and how they work, the more prepared you will find yourself when they come knocking. And with that thought, here are 7 computer viruses you should know about.

1. Polymorphic Virus

‘Nasty’ is underrated when we talk about this virus family. When a polymorphic virus infects a computer, before it starts multiplying it creates copies of itself with every copy slightly different from one another. And because this virus is capable of creating such duplicates constantly, it can be difficult for antivirus programs to detect it.

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2. Resident Virus

A resident virus is different from a non-resident virus in the way it functions. A non-resident virus needs to be executed first, before it begins its infection. However, a resident virus can activate itself whenever the operating system loads. It is able to do this because it stores and hides within the memory of the infected computer, which is why it is difficult to get rid of such viruses.

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3. Boot Sector Virus

First, let’s understand what is a boot sector – it is a section on a computer’s hard drive or an external storage media. This section contains information which is required to boot a computer. A boot sector virus infects part of this boot sector called the master boot record (MBR) and replaces legitimate information with its own infected version. The virus gets activated before the operating system loads and it may make the infected computer unbootable.

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4. Multipartite Virus

While other viruses attack one component of a computer at a time, a multipartite virus attacks two. This virus can infect both the boot sector and the system or program files at the same time. This triggers infections at multiple sections in the computer – just like multiple bombs detonating at various places at the same time. Because of this dual infection approach, the multipartite virus can re-infect the same system over and over again until all its components are completely eradicated.

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5. Overwriting Virus

True to its name, an overwriting virus destroys the file it infects. It does this by overwriting data in the system’s memory. The virus can be removed only by deleting the infected file. Often, cleaning an overwriting virus means losing the infected programs and reinstalling them.

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6. Browser Hijacker Virus

It’s also known as a browser redirect virus and so because it’s sole purpose is to redirect you to websites without your consent. Once inside a computer, it modifies the settings of the web browser (including default search engine and home page) and takes a user to malicious websites (in most cases). A browser hijacker spreads through malicious email attachments, free downloads or when a user visits an infected website. This virus can install a spyware on the infected system and this may compromise the user’s private data (personal or financial information). It can also install other viruses such as ransomware that encrypts a system’s data and demands money (ransom) in exchange.

 

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7. Macro Virus

Let’s first understand what is macro. Macro is a set of commands that can be installed in programs like MS Word or Excel to trigger a specific function automatically. It is mostly used for automating common, repetitive tasks. A macro virus is a malicious program that is written in the same macro language and replaces/alters a pre-installed macro in a program like MS Word or Excel. And when such a document is opened, it causes a series of actions to begin automatically. These actions include infecting every other document on a user’s computer, causing irregularities in text documents, accessing email accounts, sending spam messages to people in the user’s address books, etc. A macro virus can affect Windows, Linux and even Mac.

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What we have described here about these 5 computer viruses is just one tiny aspect of what they do. Details on how viruses and malware function might not be easily comprehended by everyday users. But the main message here is that such malicious programs can turn your digital devices against you. And the only way you can defeat them is by educating yourself on cybersecurity and using a multilayered security solution that can stand between these threats and your computer.

 

If you think is post is helpful and information, do share it with your friends and peers.

 

Sources:

https://www.lifewire.com/what-is-a-boot-sector-2625815
https://www.techopedia.com
https://www.makeuseof.com
https://www.webopedia.com/TERM/M/multipartite_virus.htm

 

This post has been updated as of 13.3.2017

Rajiv Singha

Rajiv Singha

Follow @Singha_Ra

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SUJIT KUMAR JANA
SUJIT KUMAR JANA
3 years ago

THANK YOU FOR INFORMATION.

KISHOR KUMAR DAS
KISHOR KUMAR DAS
3 years ago

Lot of thanks for this message.

Kriyanta Haldar
Kriyanta Haldar
3 years ago

But..How to get rid of these Virus, and do formatting the PC solves the problem..??

V.K.Gupta
V.K.Gupta
3 years ago

It is very educative to the PC users but the point is how to deal with such uninvited threats. One is buy and install good antivirus what are the others do’s and do not do’s.

Siva
Siva
3 years ago

Thank you for your kind information

rangeswaran
rangeswaran
3 years ago

useful

ARVIND KOLI
ARVIND KOLI
3 years ago

१० यूजर कि
क्विक हेअल टोटल सिक्यूरिटी उपडेट नहीं हो रहा है
रजिस्टर होने के बाद उपडेट होके उपडेट छोड़ देता है और COPY IS NOT REGISTERED बताता है क्या करे

gsjana2014@gmail.com
gsjana2014@gmail.com
3 years ago

Gouri Sankar Jana : January 25,2017 at 8:22AM
This is a Surprise message.

zamzam tower
zamzam tower
3 years ago

5 dangerous computer virus every PC. pls solution this my computer virus

akdhupar@gmail.com
akdhupar@gmail.com
3 years ago

HOW A LAY MAN SHOULD PROTECT DEVICES FROM SUCH SAID DANGERS/NOTIFICATION/WHAT-WHERE SETTINGS.

Gaurav
Gaurav
3 years ago

Nice customers services

AJAY PRATAP
AJAY PRATAP
3 years ago

Dear Rajib, Way to go!

krishna sharma
krishna sharma
3 years ago

thanks for the alert ,please help me

yuvraj mishra
yuvraj mishra
3 years ago

how to destroyed the this virus

mohit
mohit
3 years ago

Nice services

Naresh Pareya
Naresh Pareya
3 years ago

Is free downloading effect my system?

rezabipara.jpt@gmail.com
rezabipara.jpt@gmail.com
3 years ago

How to I am virus protected my computer

Kar Ashamukul
Kar Ashamukul
3 years ago

26.01.2017My computer is affected from the last evening producing multiple files of the same name. I use Quick Total Security to protect my computer. Pl help.
Kar Ashamukul 26.01.2017
mail address: amklevel@gmail.com

nikhil
nikhil
3 years ago

my computer have 5 virus

Nimit
Nimit
3 years ago

thanks man! but i still have a pinch of doubt that can my Gaurdian NetSecure(Quick Heal Group) eradicate these virus! If yes then just By simple system scan??

and By the way thank you Singha!!!!!!!

ramsingh
ramsingh
3 years ago

good

syed abdur rahman
syed abdur rahman
3 years ago

Sir,
I have read the article but a Person Like Us who dont know how to get the system free from such viruses what sort of remedy you suggest to get rid of it, Kindly take a pain to give the details so that I may be in a position to use such remedy because since last one year I have to formate my system time to time due to such attacks;
Thanking yo in an anticipation of your Co-operation,
Syed Abdur Rahman

Sunil Kumar Ruia
Sunil Kumar Ruia
3 years ago

All viruses remove.

ajay kumar
ajay kumar
3 years ago

let us thanks for this message

syedkhaja multani
syedkhaja multani
3 years ago

thanks

hrushikesh
hrushikesh
3 years ago

very useful thanxs

Mukesh Biswal
Mukesh Biswal
3 years ago

On behalf of my knowledge I have been heard that on WhatsApp there are pdf virus and video virus on it. Is it true.

amrit murmu
amrit murmu
2 years ago

very power full anti virse

Satyendar Tak
Satyendar Tak
2 years ago

THANK YOU FOR INFORMATION.

aNIL pANDITA
aNIL pANDITA
2 years ago

vERY iNFORMATIVE…
tHANKYOU FOR THIS…

Ganesh
Ganesh
2 years ago

Sir mere phone me ye message kyu aa rhi h. Kuch problems h kya

rajiv
rajiv
2 years ago

Good app

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