Types of computer virus [ how they infect your PC]

What is a computer virus?

A computer virus is a program, script or macro designed to cause damage, steal personal information, modify data, send emails, display messages or some combination of these actions.

When the virus runs, it spreads by copying itself into or over data files, programs or boot sector of a computer's hard drive, or potentially anything else that can be written. To help spread the infection, virus creators use detailed knowledge of security vulnerabilities, zero days or social engineering to gain access to a host's computer.

Types of virus

Worm: This is one of the common types of viruses on computers that can spread through networks and emails. It does not damage or infect files, but its replication occurs very quickly and can collapse the entire network.

Trojan: can be disguised as an application or program. This is one of the types of viruses on computers that do not copy or replicate itself, but can cause damage or compromise the security of the computer. The Trojan virus copies the files from the computer, which results in the possibility of damaging the files or even deleting them.

Web Scripting: complex web page codes are included to create interactive and interesting content; However, this virus has the ability to exploit these codes. This virus may be present in infected web pages or in web browsers.

Multi-party virus: this is one of the types of viruses in computers that can spread in many possible ways. At first it has the tendency to remain in the memory of a certain computer just like the resident virus, and then infects the hard disk.

FAT virus: The FAT virus, as the name implies, is one of the common types of viruses on the computer that infects the FAT sections that can cause the loss of information from entire directories or individual files.

Macro virus: this is one of the types of viruses on computers that infect files created with the use of certain programs or applications with macros such as .doc, .pps, .xls, .mdb, etc. Files containing macros are instantly infected by the macro virus. Documents such as MS Excel or MS Word are also infected by this virus and their infection can spread to other related documents.

Boot sector virus: commonly propagated by a floppy disk, this is one of the types of viruses on computers that infects the boot sector of a hard drive.

What is the main motive of virus?

Its main reason is to damage your PC or steal data from your PC. In addition there is another reason for a virus.

Increase file size

By infecting files, viruses will increase the size of the file. However, with more sophisticated viruses, these changes can be hidden.

A virus can delete files while the file is running

Because most of the files are loaded into memory, once the program is in memory, the virus can delete the file used to run the virus to help hide its tracks.

It can corrupt random files

Some destructive viruses are designed to corrupt, destroy and delete files.

It can cause write protection errors when executing .exe files from a write-protected disk

Viruses may need to be written to the files that are running; Because of this, if a floppy disk is write protected, you may receive a write protection error.

You can convert .exe files to .com files

Viruses can use a separate file to run the program and rename the original file to another file extension, so the exe file runs before the com file.

You can restart the computer when it runs

Numerous computer viruses have been designed to make a computer restart, freeze or perform other tasks that are not normally displayed on the computer. However, keep in mind that although your computer may have these symptoms, it does not mean that your computer has a virus.

How a virus enters your PC?

There are several ways a computer can become infected with spyware, viruses, and malware. Below is a list of methods of how your computer can become infected. We've made this list in the order we believe to be most to least common.

1. Mostly computer gets infected when you are installing software. It is a common way hackers attached a virus to a legit software and upload it on the web.

2. Download a file to your computer. It is also a common way hackers send virus to your PC. They simply give some jaw-dropping offers to download the file on your PC. Like you will earn PayPal money or Bitcoin. Unfortunately, most of them are virus

3. Pop up ads. It shows up mostly when you visit a porn site. They threw the adware to open that video or image. But these are mostly viruses. Who is waiting to be get clicked and installed on your browser or in your PC?

4. Beware next time when you are opening a spam email or an email attachment it might be a virus. Computer criminals. Attach virus algorithm to .com, .exe, .sys, .bin, .pdf, .pif, Docx or they even can attach to an image also. If you click on them the virus will installed on your PC.

5. Inserting an infected USB drive or a disk. Your PC will also get infected. So next time scan a drive before using it.

6. Pirated movies, music or software is also virus these files and programs contain viruses, spyware, trojans, or malicious software. Which infects your PC.

7. If you don't have any antivirus or a spyware scanner. Your PC is vulnerable to viruses. There is a high chance that the PC will get infected.

How will you know that your PC is infected with viruses?

Does your computer run slowly? You may be infected by a virus. This is the main symptoms PC show when it infected by a virus. PC may also restart it self also a sign of virus infection.

How to remove a computer virus?

If you believe that your computer or storage device, such as a USB flash drive, is infected with a virus, run an antivirus scan on the computer. Open your antivirus scanner through the Windows notification area or the Start menu and run a full system scan to verify if all files on your computer have a virus.

If the antivirus program detects the virus, you will be prompted to move the virus to the virus vault or to delete infected files. Both options are a good way to eliminate the virus from the computer.

If you do not have an antivirus installed on your PC. You can then use the Windows Defender program to scan your PC and remove the infected program from your PC