Basic Computing

Types of computer viruses harmful to the system

Cybersecurity experts define that a computer virus is a type of malware, as well as worms, that can multiply themselves with the aim of damaging as many systems as possible. In this article, we describe the types of computer viruses that are harmful to the system. We hope it is useful. 10 types of computer viruses

10 Types of computer viruses

10 types of computer viruses
10 types of computer viruses

The types of computer viruses are basically malicious programs that damage or modify files or other systems. Said viruses act as follows: it embeds its malicious coding in the internal part of the file, so that, from that moment, said file, which becomes an executable, remains as the carrier of this virus and thus, a replicator of East.

The following are the different types of computer viruses that can modify or damage systems:


It is a technical computer term that results from the conjunction of the words: malicious software or malicious software. These types of computer viruses are intended to sneak in and damage a computer or files without the owner’s permission.

So, malware is mainly coined to refer to any computer threat. Within these types of computer viruses , there are several more detailed categories according to each threat such as worms, Trojans, computer viruses, adware, spyware or ransomware.

Computer virus

This is a class of malware, whose function is to affect the correct functioning of a system. The way to infect is through malicious code, and its particular feature is that it needs the participation of the user of the system to run, and at that moment, controls in order to damage the computer by spreading.

There are different types of computer viruses , those that are made to only annoy, but there are others that severely damage the computer, eliminating files that are important for the system and its operation.

Generally, they do not tend to hide, but instead look like executable files, example: Windows .exe.

Computer worm

This is another type of computer virus of the most frequent malware, and the difference with viruses is that it is not necessary for the user or for any file to be changed to infect the computer. Like the virus, it can replicate and spread.

When entering a computer, the worm tries to acquire the addresses of other computers through contact lists, to send copies and infect them.

They can make common computer tasks excessively slow, and it also makes your computer send messages without authorization through email or any social network.


A Trojan tries to go unnoticed while entering the computer in order to take actions to try to open the system to other malicious programs that may enter it.

One of the commonality between different classes of malware is that they try to enter the system as if they were legal files. This malware enters your computer as a legal program and while inside, it makes space between the defense system for other malware files to enter and infect. Trojans cannot spread themselves.


These other 10 types of computer viruses can be installed on your computer, they work in secret, hiding themselves permanently so that your defenses are not activated.

Its objective is to collect all the information about the user, the actions carried out on the computer, the content of the hard disk, the applications and programs installed and all the actions carried out on the internet.


These 10 types of computer viruses are a kind of program that is complicated to classify, since it does not affect the computer, but has the sole objective of entering it and showing advertising, while it is on the internet when a program is running.

This kind of software is installed in programs that later spreads for free, being a way of making money for developers.


These 10 types of computer viruses are responsible for kidnapping information from the computer and requesting a monetary ransom in order to release the information. This is one of the most popular malware in recent times, which is why it is recommended to permanently update the antivirus

Other 10 types of computer viruses

There are other types or classes according to their characteristics, the most important are described below:

Resident viruses

This type of computer virus hides inside the RAM memory and from there, they manage to intercept all the actions that are carried out in the system, damaging all the programs or applications that are executed.

Direct-acting virus

The main objective of this virus is to multiply and when it reaches its ideal condition, it manages to activate itself and goes to programs and applications to infect them.

Overwrite virus

These viruses have the particularity of damaging the infected file, since they write on its content, making it practically completely damaged.

Boot virus

These 10 types of computer viruses do not infect files or programs, but rather the hard drives that the computer has. They first infect the boot area of ​​storage devices or hard drives.

When the computer starts up with a storage device, the boot virus will infect this disk. This virus does not damage the computer as long as it does not boot, so the best way is to protect all storage devices against writing

Directory virus

This virus modifies the addresses that indicate where files or programs are stored. In this way, when a program runs, the virus actually runs. And when the infection is generated, it is impossible to find it, much less, to be able to use the folders.

Polymorphic viruses

They are 10 types of computer viruses that each time they infect, are encoded differently, thus developing a large number of copies, preventing antivirus from locating them.

Multipartite viruses

These make a chain of infections, their basic function is to infect any component, file or program.

File virus

This virus infects executable programs or folders. When executing the program that contains it, it proceeds to be activated.

FAT virus

This virus attacks fundamental elements in the computer, stopping the entrance to certain areas of the disk, where it is possible to save the fundamental folders or those of critical condition for the optimal functioning of the computer.

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