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4 Types Of Computer Viruses And It’s Effects

by Maverick on April 1, 2011

The various kinds of computer viruses can be classified according to their source, process, kinds of files that they attack, the place they hide, the type of damage they cause, the kind of OS or platform they infect and so on. So here is a quick glance on the various types of computer viruses and it’s effects.

Computer Virus Type And Effect 4 Types Of Computer Viruses And Its Effects

Resident Viruses

Resident viruses are a group of malicious computer virus. A resident virus fastens to the memory of your PC and stays hidden. Once the memory that the resident virus is attached to gets triggered, the virus activates concurrently. Then the virus will progress to infect a file or disk. The best protection against resident viruses is a state-of-the-art antivirus program.

Overwrite Viruses

These overwriting types of viruses copy their code over their host file’s data, therefore destroying the original program. Certainly, the original program no longer runs, thus the infection become obvious. Therefore, overwriting viruses have never been successful at spreading in the field. Disinfection is feasible, even though files cannot be recovered. It is typically essential to delete the original file and swap it with a clean copy.

Macro Virus

Among the types of viruses, this one is a computer infection written in macro language, which is usually built into word processing applications. As most macros start automatically whenever a document is either opened or closed, this virus tries to substitute the original document using malicious code. Then the infection tags replacement code using similar functions and name whenever the command is run which takes place whenever a user runs the file. After it is opened, this virus starts to implant itself inside other templates and documents. It also prepares to attack other files that will be created ultimately. Based on the resources it can access, this virus can harm other places of the OS. This happens because the infected files get shared among other devices and users.

Polymorphic Virus

This virus was created to mystify virus scanners. Polymorphic Viruses are harder to notice by scanning. Essentially, polymorphic code changes form although it maintains its original algorithm. One widespread way of polymorphism is code encryption. Nevertheless, it is not feasible to encrypt all, as a tiny bit of the code has to be left out for performing decryption for running the remaining code. Anti-virus software can target this tiny bit of code to counter the polymorphism problem.

Have you encountered any of these computer viruses? Do share your experience with us, here in the comments section.

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{ 3 comments }

Prasanjit Bera April 3, 2011 at 12:49 pm

This was a nice informatic..!!:)

Ryan Graham April 6, 2011 at 7:33 am

Nice article! It does a very good job of explaining these four types of computer viruses and their effects

Charlie April 6, 2011 at 5:16 pm

Hi there. Thanks for this guide to various viruses and their effects. At AVG, we think it’s great that there are others spreading the word about the threats internet users can encounter. We work constantly to safeguard our users from these threats, and it’s something we take very seriously. To see if we have anything that can help you stay safe, or to join the discussion at our forum.

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