Different Types of Computer Viruses Everyone MUST Know About

A computer virus is a software program written with malicious intentions. There is the quantity of pc viruses which could hinder the functioning of your computer device. Computer viruses are portions of pc code, designed to implant itself in applications or files with the idea of destroying, or changing the facts transmitted. Types of viruses can be spread thru interchange of documents and applications, loaded onto a pc and performed. They gradual down desktop computers, crash a gadget, or genuinely reroute facts to different gadgets. Virus numbers have risen for the reason that 90s and the united states government have handed legal guidelines making virus creation into computer systems of unknowing victims, a severe crime. Software groups have additionally sought to stem the tide by creating packages particularly for tracking down viruses and preventing them. Below are articles which provide facts on cutting-edge pc viruses, virus records, laptop computers virus protection and removal.


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Did You Know?

In 2010, Stuxnet virus centered Siemens Industrial Software and Equipment. There are allegations that this virus is a part of a U.S. And Israeli intelligence operation named “Operation Olympic Games” and it hit Iran’s nuclear plant Natanz.

A computer virus is a dangerous software program software written intentionally to go into a computer without the consumer’s permission or knowledge. It has the capacity to replicate itself, accordingly continuing to spread. Some viruses do little but replicate, while others can reason excessive harm or adversely affect this system and overall performance of the system. A virus needs to never be assumed innocent and left on a gadget.

There are different sorts of viruses which can be classified in line with their foundation, strategies, sorts of documents they infect, where they cover, the kind of damage they purpose, the sort of running device, or platform they assault. Let us have a examine few of them.

Memory Resident Virus

These viruses repair themselves inside the laptop reminiscence and get activated on every occasion the OS runs and infects all of the files which are then opened.

Hideout: This form of virus hides inside the RAM and stays there even after the malicious code is completed. It gets control over the machine reminiscence and allocates reminiscence blocks via which it runs its own code, and executes the code whilst any characteristic is done.

Target: It can corrupt documents and applications that are opened, closed, copied, renamed, and many others.

Examples: Randex, CMJ, Meve, and MrKlunky

Protection: Install an antivirus program.

Direct Action Virus

The principal motive of this virus is to duplicate and take movement when it is accomplished. When a selected situation is met, the virus will go into motion and infect files inside the listing or folder which might be unique inside the AUTOEXEC.BAT file course. This batch record is continually located in the root directory of the tough disk and consists of out positive operations when the pc is booted.

FindFirst/FindNext technique is used in which the code selects some documents as its victims. It additionally infects the outside gadgets by using copying itself on them.

Hideout: They maintain changing their place into new documents each time the code is finished, but are usually determined in the hard disk’s root directory.

Target: It is a record-infecter virus.

Examples: Vienna virus

Protection: Install an antivirus scanner. This type has a minimum impact on the computer’s overall performance.

Overwrite Viruses

A virus of this kind is characterized by way of the fact that it deletes the records contained in the documents that it infects, rendering them partially or definitely vain after they had been infected.

Hideout: The virus replaces the report content. However, it does not exchange the record size.

Examples: Way, Trj.Reboot, Trivial.88.D

Protection: The handiest manner to easy a report inflamed via an overwriting virus is to delete the report completely, accordingly losing the original content material.

However, it’s miles very smooth to stumble on this kind of virus, because the original program turns into useless.type

Boot Sector Virus

This form of virus influences the boot quarter of a tough disk. This is a crucial a part of the disk, in which statistics of the disk itself is stored in conjunction with an application that makes it possible to boot (start) the computer from the disk. This type of virus is also known as Master Boot Sector Virus or Master Boot Record Virus.

Hideout: It hides in the reminiscence till DOS accesses the floppy disk, and whichever boot facts is accessed, the virus infects it.

Examples: Polyboot.B, AntiEXE

Protection: The great way of heading off boot region viruses is to ensure that floppy disks are write-covered. Also, in no way begin your computer with an unknown floppy disk within the disk pressure.

Macro Virus

Macro viruses infect documents which are created using positive applications or applications that incorporate macros, like.The document, Xls, Pps, and so forth. These mini-packages make it feasible to automate the collection of operations in order that they may be carried out as an unmarried movement, thereby saving the consumer from having to hold them out one by one. These viruses mechanically infect the record that contains macros and additionally infects the templates and files that the record contains. It’s called a kind of email virus.

Hideout: These disguise in documents that are shared via email or networks.

Examples: Relax, Melissa.A, Bablas, O97M/Y2K

Protection: The great safety method is to avoid commencing e-mails from unknown senders. Also, disabling macros can help to guard your beneficial records.

Directory Virus

Directory viruses (additionally known as Cluster Virus/File System Virus) infect the listing of your pc via changing the route that shows the vicinity of a file. When you execute a software report with an extension.EXE or.COM that has been infected by way of a virus, you’re unknowingly walking the virus software, whilst the original record and software is formerly moved with the aid of the virus. Once infected, it will become impossible to discover the authentic files.

Hideout: It is typically placed in simplest one vicinity of the disk, but infects the whole application within the listing.

Examples: Dir-2 virus

Protection: All you can do is, reinstall all the files from the backup which are inflamed after formatting the disk.

Polymorphic Virus

Polymorphic viruses encrypt or encode themselves in a special manner (using different algorithms and encryption keys) whenever they infect a machine. This makes it not possible for antivirus software to locate them the usage of string or signature searches (because they’re one of a kind in every encryption). The virus then goes directly to create a huge number of copies.

Examples: Elkern, Marburg, Satan Bug and Tuareg

Protection: Install a high-cease antivirus because the everyday ones are incapable of detecting this type of virus.

Companion Virus

Companion viruses can be taken into consideration as a form of report infector virus, like a resident or direct movement types. They are known as associate viruses due to the fact after they get into the device they ‘accompany’ the opposite documents that exist already. In different phrases, to perform their contamination routines, partner viruses can wait in reminiscence until an application is administered (resident virus), or act without delay by using making copies of themselves (direct action virus).

Hideout: These typically use the equal filename and create a distinct extension of it. For example: If there’s a record “Me.Exe”, the virus creates any other record named “Me.Com” and hides within the new file. When the device calls the filename “Me”, the “.Com” document receives done (as “.Com” has better priority than “.Exe”), as a result infecting the device.

Examples: Stator, Asimov.1539 and Terrax.1069

Protection: Install an antivirus scanner and also download Firewall.

FAT Virus

The file allocation desk (FAT) is the part of a disk used to save all of the statistics about the area of files, available area, unusable space, and so forth.

Hideout: FAT virus assaults the FAT section and can damage critical records. It may be mainly dangerous because it prevents get right of entry to positive sections of the disk where critical files are stored. Damage brought on can result in lack of data from person files or even whole directories.

Examples: Link Virus

Protection: Before the virus assaults all of the documents at the laptop, find all the files that are certainly needed at the tough power, and then delete the ones that are not needed. They can be documents created with the aid of viruses.

Multipartite Virus

These viruses unfold in multiple ways feasible. Action relies upon the running device set up and the presence of certain documents.

Hideout: In the preliminary section, these viruses have a tendency to cover inside the reminiscence as the resident viruses do; then they infect the tough disk.

Examples: Invader, Flip, and Tequila

Protection: You want to ease the boot quarter and also the disk to do away with the virus, after which reload all of the data in it. However, ensure that the information is clean.

Web Scripting Virus

Many internet pages consist of complicated codes so one can create a thrilling and interactive content material. This code is often exploited to result in certain unwanted moves.

Hideout: The important resources of web scripting viruses are the internet browsers or infected internet pages.

Examples: JS.Fortnight

Protection: Install the Microsoft tool application that could be a default feature in Windows 2000, Windows 7 and Vista. Scan the laptop with this software.


A trojan horse is a program very just like a plague; it has the ability to self-reflect and can result in negative outcomes to your gadget. But they can be detected and removed via an antivirus software.

Hideout: These typically unfold thru e-mails and networks. They do not infect files or damage them, but they mirror so speedily that the whole community can also collapse.

Examples: PSWBugbear.B, Lovgate.F, Trile.C, Sobig.D, Mapson

Protection: Install an updated model of antivirus.


Trojans or Trojan horses, in contrast to viruses, do no longer reproduce by way of infecting different documents, nor do they self-mirror like worms. In reality, it’s miles a program which disguises itself as a useful application or software.

▶ Beware of the reality that those viruses copy documents for your computer (whilst their carrier software is performed) which could damage your records, or even delete it. The attacker also can apply the Trojans in the sort of manner that the facts on your computer are available to them.

Logic Bombs

They are not taken into consideration viruses because they do now not reflect. They are not even packages in their personal right but instead camouflaged segments of different programs. They are handiest done whilst a positive predefined condition is met. Their objective is to ruin information at the computer as soon assure conditions were met. Logic bombs cross undetected till released, the consequences may be unfavorable, and your entire records can be deleted!

Viruses Affecting Palm OSViruses

The preliminary launch of Palm OS in 1996 and then the solid launch in 2007 made way for attackers to put in writing new malicious codes. The viruses known until the date that has an effect on this sort of OS are:

“Liberty” Crack: It is a Trojan horse that deletes all your files and packages out of your PDA.

PEMagic: It allegedly deletes the ROM.

Phage: It deletes your files.

Vapor: It deletes your files.

With all stated and done, there may be no actual danger in your PDAs as regards to virus assaults.

Viruses Affecting Symbian OS

Symbian OS additionally has no verified virus threats. The only virus that is said to have an effect on the smartphones is the Cabir virus. However, this virus runs within the background and drains the battery power. The truth that those viruses unfold thru Bluetooth has also demonstrated to be a myth.
Besides, there are many different laptop viruses which have an ability to infect your virtual facts. Hence, it is a need to which you defend your records by way of putting in a true satisfactory antivirus software.