Computer Virus: Types & Classification

Last updated on November 12th, 2018

What is a computer virus?

A computer virus is a malicious program bug that self-replicates by repeating itself to a different program. In different words, a computer virus spreads by itself into different executable code or documents.The aim of making a malicious program is to infect vulnerable systems, gain admin control and steal user sensitive data. Hackers design viruses with malicious intent and take advantage of online users by tricking them.

There are 2 varieties of ways in which in viruses operate, shortly as they land on a new device they start replicating, whereas the second kind plays dead till a specific trigger makes the malicious code to be executed. Thereby, it’s extremely vital to remain protected by installing a sturdy antivirus program.

Types of Computer Viruses:

  • Boot Sector Virus: This sort of virus infects the master boot record and it’s difficult and a complex task to get rid of this virus and sometimes needs the system to be formatted. Principally it spreads through removable media.
  • Resident Virus: The Resident virus implants itself inserts itself within the memory of a computer. Basically, initially, the virus program isn’t needed to infect new files or applications. Even when the original virus is deleted, the version keeps in memory and may be activated. This happens once the operating system loads applications or functions. The resident viruses are difficult because of the rationale they will run ignored by antivirus and antimalware software system by concealment within the system’s RAM.
  • Multipartite Virus: This sort of virus spreads through multiple ways. It infects both the boot sector and executable files at an equivalent time.
  • Overwrite Virus: The virus once offensive the pc starts overwriting files with its own code. These viruses square measure capable of targeting specific files or consistently write applications and everyone files on an associate infected device. The sole attainable mechanism to get rid of is to delete the infected files and the end-user should lose all the contents in it. Distinguishing the overwrite virus is difficult due to the fact that spreads through emails.
  • Space filler Virus: Also referred to as “Cavity Viruses”, they refill the empty partitions between the code and thus don’t cause any harm to files
  • Macro viruses: It significantly targets macro language commands in applications like Microsoft Word. In Word, macros are keystrokes that are embedded within the documents sequences for commands.
  • Polymorphic Viruses: It’s a malware sort that has the power to alter or change its underlying code while not ever-changing its basic functions or options. This helps the virus on a pc or network to evade detection from several antimalware and threat detection product. Once a security software system detects a polymorphic virus, the virus modifies itself thereby, it’s not detectable mistreatment the previous signature.
  • Web Scripting Virus: Similar to the hyperlinks that we tend to utilize in Microsoft Word, several websites rest on codes to produce engaging content to their users. As an example, since the trends of observance videos online have currently become extremely popular – more than two Billion Videos are streamed on Facebook on a daily basis, these videos conjointly execute a particular code. These codes may be exploited and it’s very difficult to notice that this exploitation has taken place on some very notable sites. All the hackers have to do is leave a comment in the Comments Section of the website that contains that code.
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