18 Types of Computer Viruses and How It Works

Windows Garden - Viruses not only attack humans but can also attack man-made systems, in this case is "computer". Viruses on computers do not come due to bad weather but through various intermediaries such as internet, applications, connected devices, and others.

Actually there are various kinds of "virus" that can harm our computers. Here we will discuss all types of viruses or malware that can attack our computer anytime and anywhere complete with explanations and how it works.

1. Ransomware

Ransomware is a malware that has the ability to lock the computer or encrypt files so that it cannot be accessed by the user.

Usually the goal is to get the user to render the ransom money so that the "hostage" file can be released. Its usually attack a computer, mobile device, or server with Windows operating system.

2. Trojan

Trojan may not be a virus or malware that foreigners ears computer users. Trojan is a virus that has the ability to control and steal existing data in the computer.

3. Worm

Worm is a virus or program that has the ability to multiply or multiply very quickly. If the virus is left then the capacity of memory or hard drive that accommodates this virus will be filled by garbage files.

4. Spyware

Spyware is a kind of software, its presence is unconscious and its used to spy on infected computers. Spyware is able to transmit data from the user's computer to another party or vice versa when connected to the internet network. Spyware can also cause the computer to run slow or crash.

5. Memory Resident Virus

Memory Resident Virus is a virus that infects memory or RAM on a computer. This virus will usually be active starting when the computer is turned on. The effect is the performance of computers to be slow and less than the maximum.

6. Multipartite Virus

This type of virus is usually a particular file that infects a particular operating system. These viruses tend to hide in the memory (RAM) then infect the hard disk. This virus is able to infect very quickly,

7. FAT Virus

FAT stands for File Allocation Table. FAT is part of the disk that stores all information about the disk. FAT virus is a virus that attacks FAT and important information in it. As a result, certain information and files that are in the attacked directory can be hidden or lost.

8. Directory Virus

Directory Virus is a type of virus that infects files with exe extensions. which is in the directory where the virus is located. Instantly the program is error or lost for no apparent reason. How it works is to move the original program with a virus program that will be run.

9. Macro Virus

Macro virus infects files created using certain applications or programs that contain macros, such as doc, Xls, Pps, Mdb, etc. The virus also infects templates and documents. This is also called the type of virus e-mail. Usually spread from documents shared via the internet or e-mail.

10. Boot Sector Virus

As the name implies, this virus infects a computer called disk boot sector. This is an important part of the disk, where information from the disk itself is stored together with a program that allows it to boot.

11. Overwrite Virus

This type of virus is able to eliminate data or files without reducing the capacity on the hard disk.

Basically the file will be lost but the hard disk capacity remains normal, as if the file still exists.

12. Web scripting Virus

As the name suggests web scripting virus is a code program that is used to beautify the content in the website. However, this code will actually disrupt the program, usually this virus will appear when connected to the internet.

13. Polymorph Virus

This virus has the ability to encrypt or encode yourself in different ways when it infects the system. The virus is able to change its structure after it successfully infects, making it difficult to detect.

14. Metamorphic Virus

Metamorphic virus is a development of oligomorphic and polymorphic type viruses. This virus has the ability to change its own coding so it is very difficult in detection.

15. Companion Virus

This virus is hiding in the hard disk that has the ability to create extensions that are different from the original file extension. And this type of virus is usually assembled with new files.

16. Direct Action Virus

This type of virus is able to infect the type of Autoxec.bat file located on the hard disk. This type of virus is usually active when the first operating system to boot. In addition, the virus is also able to infect external devices such as hard disk and flash, which is able to make this virus spread to other computers.

17. Backdoor

This type of virus can be used to access systems, applications, or networks. This virus is able to hack a system that was previously hacked without repeating the process of hacking.

18. Rogue

Rogue is a program that mimics an antivirus program and displays activity like a normal antivirus, and provides fake warnings about the presence of viruses. The goal is that users buy and activate the fake antivirus program to benefit the creator of the program / virus. The program also opens loopholes to bring in other viruses.

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