List of computer viruses

To aid the fight against computer viruses and other types of malicious software, many security advisory organizations and developers of anti-virus software compile and publish lists of viruses.
The compilation of a unified list of viruses is made difficult because of naming. When a new virus appears, the rush begins to identify and understand it as well as develop appropriate counter-measures to stop its propagation. Along the way, a name is attached to the virus. As the developers of anti-virus software compete partly based on how quickly they react to the new threat, they usually study and name the viruses independently. By the time the virus is identified, many names denote the same virus.
Another source of ambiguity in names is that sometimes a virus initially identified as a completely new virus is found to be a variation of an earlier known virus, in which cases, it is often renamed. For example, the second variation of the Sobig worm was initially called "Palyh" but later renamed "Sobig.b". Again, depending on how quickly this happens, the old name may persist.

Scope

In terms of scope, there are two major variants: the list of "in-the-wild" viruses, which list viruses in active circulation, and lists of all known viruses, which also contain viruses believed not be in active circulation (also called "zoo viruses"). The sizes are vastly different, in-the-wild lists contain a hundred viruses but full lists contain tens of thousands.

List of viruses and related programs

Name	Alias(es)	Type	Subtype	Isolation Date	Isolation	Origin	Author	Notes
1260		MS-DOS		1990			Mark Washburn	First virus to use polymorphic encryption
4K	4096	MS-DOS	January 1990					The first virus to use stealth
5lo		MS-DOS		October 1992				Infects .EXE files only
A and A		MS-DOS Windows 95/98
Abraxas	Abraxas5	MS-DOS Windows 95/98		April 1993	Europe		ARCV group	Infects COM file. Disk directory listing will be set to the system date and time when infection occurred.
Acid	Acid.670, Acid.670a, Avatar.Acid.670, Keeper.Acid.670	MS-DOS Windows 95/98		1992			Corp-$MZU	Infects COM file. Disk directory listing will not be altered.
Acme		DOS (Windows 95 MS-DOS)						Upon executing infected EXE, this infects another EXE in current directory by making a hidden COM file with same base name.
ABC	ABC-2378, ABC.2378, ABC.2905	MS-DOS		October 1992				ABC causes keystrokes on the compromised machine to be repeated.
Actifed		MS-DOS
Ada		MS-DOS		October 1991		Argentina		The Ada virus mainly targets .COM files, specifically COMMAND.COM.
Agena	Agena.723	MS-DOS		September 1992	Spain			Infected programs will have a file length increase of 723 to 738 bytes
AGI-Plan	Month 4-6	MS-DOS			Mühlheim an der Ruhr, Germany			AGI-Plan is notable for reappearing in South Africa in what appeared to be an intentional re-release.
Ah	David-1173, Tuesday	MS-DOS		May 1991	Italy			Systems infected with Ah will experience frequent system hangs.
AI		MS-DOS
AIDS	AIDSB, Hahaha, Taunt	MS-DOS		1990			Dr. Joseph Popp	AIDS is the first virus known to exploit the MS-DOS "corresponding file" vulnerability.
AIDS II
AirCop	Air cop-B, Red State	MS-DOS		Jan 1990				Infects the boot sector of floppy disks.
Alabama	Alabama.B	MS-DOS		October 1989		Hebrew University, Jerusalem		Files infected by Alabama increase in size by 1,560 bytes.
Alcon	RSY, Kendesm, Ken&Desmond, Ether	MS-DOS		December 1997				Overwrites random information on disk causing damage over time.
Ambulance
Anna Kournikova		Email VBScript		February 11, 2001		Sneek, Netherlands	Jan de Wit	A dutch court stated that US$166,000 in damages was caused by the worm.
AntiCMOS								Due a bug in the virus code, the virus fails to erase CMOS information as intended.
ARCV-n		MS-DOS		October - November 1992		England, United Kingdom	ARCV Group	ARCV-n is a term for a large family of viruses written by the ARCV group.
Bad Sectors 1.2
Bomber	CommanderBomber	MS-DOS				Bulgaria		Polymorphic virus which infects systems by inserting fragments of its code randomly into executable files.
Brain	Pakistani flu,			January 1986		Lahore, Pakistan	Basit and Amjad Farooq Alvi	Considered to be the first computer virus for the PC
Byte Bandit		Amiga, Bootsector virus		January 1988			Swiss Cracking Association	It was one of the most feared Amiga viruses until the infamous Lamer Exterminator.
Christmas Tree
Commwarrior		Symbian Bluetooth worm						Famous for being the first worm to spread via MSS and Bluetooth.
Creeper		TENEX operating system		1971			Bob Thomas	An experimental self-replicating program which gained access via the ARPANET and copied itself to the remote system.
Eliza		MS-DOS		Dec 1991
Elk Cloner		Apple II		1982	Mt. Lebanon, Pennsylvania, United States	Mt. Lebanon, Pennsylvania, United States	Rich Skrenta	The first virus observed "in the wild"
Graybird	Graybird P
Hare		MS-DOS Windows 95, Windows 98		August 1996				Famous for press coverage which blew its destructiveness out of proportion
ILOVEYOU				May 5 2000		Manila, Philippines	Reomel Ramores, Onel de Guzman	A computer worm that attacked tens of millions of Windows personal computers
INIT 1984		Mac OS		13-3-1992				Malicious, triggered on Friday the 13th. Shows a message "fuck this PC."
Jeefo
Jerusalem		DOS		October 1987				Jerusalem was initially very common and spawned a large number of variants.
Kama Sutra	Blackworm, Nyxem, and Blackmal			January 16, 2006				Designed to destroy common files such as Microsoft Word, Excel, and PowerPoint documents.
Koko		DOS	March 1991					The payload of this virus activates on July 29 and February 15 and may erase data on the users hard drive
Lamer Exterminator		Amiga, Boot sector virus		October 1989		Germany		Random encryption, fills random sector with "LAMER"
MacMag	Drew, Bradow, Aldus, Peace			12-1987
MDEF	Garfield, Top Cat			5-1990
Melissa	Mailissa, Simpsons, Kwyjibo, Kwejeebo	Microsoft Word macro virus		March 26, 1999		New Jersey, United States	David L. Smith	Part macro virus and part worm
Michelangelo		MS-DOS		February 4 1991	Australia			Ran March 6 (Michelangelo's birthday)
Navidad				December 2000
Natas		Multipartite, stealth, Polymorphic		1994			"Priest"
nVIR	MODM, nCAM, nFLU, kOOL, SHIT, prod, Fuck, Hpat, Jude	Mac OS		1987				nVIR has been known to 'hybridize' with different variants of nVIR on the same machine.
OneHalf	Slovak Bomber, Freelove or Explosion-II	MS-DOS		1994		Slovakia	Vyvojar	It is also known as one of the first viruses to implement a technique of "patchy infection"
Ontario.1024
Ontario.2048
Ontario	SBC	MS-DOS		July 1990		Ontario, Canada		Death Angel
Pikachu virus				June 28, 2000		Asia		The Pikachu virus is believed to be the first computer virus geared at children.
Ping-pong	Boot, Bouncing Ball, Bouncing Dot, Italian, Italian-A, VeraCruz	Boot sector virus						Harmless to most computers
RavMonE.exe	RJump.A, Rajump, Jisx	Worm		2006-06-20				Once distributed in Apple iPods, but a Windows-only virus
SCA		Amiga, Boot sector virus		November 1987		Switzerland	Swiss Cracking Association	Puts a message on screen. Harmless except it might destroy a legitimate non-standard boot block.
Scores	Eric, Vult, NASA, San Jose Flu	Mac OS		Spring 1988				Designed to attack two specific applications which were never released.
Scott's Valley		MS-DOS		September 1990	Scotts Valley, California, United States			Infected files will contain the seemingly meaningless hex string 5E8BDE909081C63200B912082E.
SevenDust	666, MDEF, 9806, Graphics Accelerator, SevenD	Mac OS		1998
Shankar's Virus	W97M.Marker.o	Polymorphic Virus		June 3, 1999			Sam Rogers	Infects Word Documents
Shoerec		Windows 32
Simile	Etap, MetaPHOR	Windows	Polymorphic				The Mental Driller	The metamorphic code accounts for around 90% of the virus' code
Stoned				1987	Wellington, New Zealand			One of the earliest and most prevalent boot sector viruses
Sunday		MS-DOS	Jerusalem.Sunday	November 1989	Seattle, Washington, United States			Because of an error in coding, the virus fails to execute its payload.
TDL-4		Botnet			JD virus
Techno		MS-DOS						The virus plays a tune that was created by the author of the virus
Whale		MS-DOS	Polymorphic	July 1, 1990		Hamburg, Germany	R Homer	At 9216 bytes, was for its time the largest virus ever discovered.
ZMist	ZMistfall, Zombie.Mistfall	Zombie.Mistfall					Z0mbie	It was the first virus to use a technique known as "code integration".