A computer worm is a self-replicating computer program. It uses a network to send copies of itself to other nodes (computers on the network) and it may do so without any user intervention. Unlike a virus, it does not need to attach itself to an existing program. Worms almost always cause at least some harm to the network, if only by consuming bandwidth, whereas viruses almost always corrupt or devour files on a targeted computer.

Many worms that have been created are only designed to spread, and don’t attempt to alter the systems they pass through. A “payload”, however, is code designed to do more than spread the worm it might delete files on a host system, encrypt files in a cryptoviral extortion attack, or send documents via e-mail. A very common payload for worms is to install a backdoor in the infected computer to allow the creation of a zombie (an Internet accessible computer compromised by a hacker) under control of the worm author. Networks of such machines are often referred to as botnets and are very commonly used by spam senders for sending junk email or to cloak their website’s address.

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There are currently 965 articles listed on worms.

Name Threat Level Detection Count Date
Worm.Yimfoca 88/10 0 May 18, 2011
Worm.Zelda 55/10 0 September 13, 2013
Worm.Zhelatin.Gen.5 December 28, 2009
Worm.Zhelatin.GG 66/10 0 August 3, 2007
Worm.Zhelatin.GQ 99/10 0 August 24, 2007
Worm.Zhelatin.HS 99/10 0 August 30, 2007
Worm.Zhelatin.ml 99/10 0 November 30, 2007
Worm.Zlybot 66/10 0 October 30, 2007
Worm/Autorun.bkjm January 24, 2011
Worm/Generic2.ceag 55/10 0 July 13, 2012
Worm/Generic2.CLCO 55/10 0 October 31, 2012
WORM/Nyxem.BK.worm 55/10 61 October 13, 2011
Worm/Opanki.ec May 17, 2010
WORM/Slenfbot.DP.5 May 9, 2011
Worm/Yahos.mg 55/10 429 February 1, 2011
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