A worm is a malicious self-replicating computer program designed to infect multiple remote computers in attempt to deliver a destructive payload. A typical worm spreads by e-mail, in file sharing networks or through unprotected network shares. Widely spread complex parasites usually propagate themselves by exploiting certain security vulnerabilities in the targeted remote system. Most worms can infect and corrupt files, degrade overall system performance and security, steal user sensitive information or install other dangerous parasites such as backdoors or trojans. Worms are very similar to regular computer viruses and therefore can have different malicious functionality. Navigate to worm parasites

Newest Worms

Jenxcus virus removal

July 1st, 2014. Jenxcus virus is a malicious worm, which is actively used for infecting computers and then stealing personal information that is kept on them. This worm is closely related to Bladabindi virus  that has also been used for these malicious activities. When having Jenxcus virus installed on... More...

Badboy removal guide

September 24th, 2013. Badboy is an Internet worm, which attacks poorly protected computers. Once it gets inside the system, this worm initiates several activities that are seriously dangerous for both, computer and user. Beware that this virus has ability to download malicious files on the system, launch and stop... More...

Get rid of Protector

September 24th, 2013. Protector is a malicious program, always categorized as an Internet worm. No matter that it's a quite old infection, it may be updated any day. Most frequently, Protector is used to steal passwords and other sensitive information from computers. However, it may also be used to download and... More...


Total Worms parasites in our DB: 1406

# | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

  • 101Tit worm April 6th, 2011 | No Comments
    101Tit is a worm that can spread itself to other computers. 101Tit seems to be related to porn sites.

  • 311 ICQ worm June 14th, 2004 | No Comments
    311 ICQ worm spreads through ICQ. With a help of 311 ICQ worm, users get access to remote computers.

  • Accid November 9th, 2005 | No Comments
    Accid is an Internet worm that spreads via MSN Messenger through instant messages and online chat conversation...

  • Achar July 29th, 2004 | No Comments
    Worm Achar is a simple Internet parasite, which spreads via file-sharing networks. It places infected files in...

  • Acoragil July 24th, 2004 | No Comments
    Acoragil is an outdated parasite, which spreads in IRC networks. This worm infects mIRC chat program and distr...

  • Adil July 29th, 2004 | No Comments
    This is an Internet worm. It spreads mostly in file-sharing networks and may distribute itself via e-mail atta...

  • Adious July 29th, 2004 | No Comments
    This is an Internet worm. It spreads mostly in file-sharing networks and may distribute itself via e-mail atta...

  • Adm worm June 15th, 2004 | No Comments
    Adm worm spreads the errors to computers. With a help of adm worm, users get access to remote computers.

  • Adore Worm June 15th, 2004 | No Comments
    Adore Worm looks for vulnerability in computers with Linux OS, and then tries to send exploits to the victim c...

  • Afghan 13 June 14th, 2004 | No Comments
    Afghan 13 is a worm that can spread itself to other computers. With a help of Afghan 13, users can get remote ...

  • Ahack September 12th, 2013 | No Comments
    Ahack is a dangerous Internet worm, which can give for an attacker a remote access to the target PC system. It...

  • AimVen July 30th, 2004 | No Comments
    AimVen spreads in the Internet. The worm modifies AOL messenger program and sends infected files to other user...

  • Ajpiidaj Worm June 15th, 2004 | No Comments
    Ajpiidaj Worm seems to spread through e-mail. Ajpiidaj Worm is related to Hybris Worm. Ajpiidaj Worm main file...

  • Al Gore worm June 15th, 2004 | No Comments
    Al Gore worm is one of the variants of a very well-known worm VBS.Loveletter. Al Gore worm is written in Visua...

  • Alasrou October 19th, 2005 | No Comments
    Alasrou is a worm that spreads by infecting computers running Windows operating system with unpatched security...

  • Aleat July 25th, 2004 | No Comments
    This is an Internet worm. It may spread via e-mail attachments or through some networks or vulnerable programs...

  • Aliz July 28th, 2004 | No Comments
    Aliz is an Internet worm, which spreads only by e-mail. It arrives as an attachment to messages. However, ther...

  • Allaple.b December 20th, 2006 | No Comments
    Allaple.b is a worm that infects network computers by exploiting several known vulnerabilities. It can also sp...

  • Almanahe b March 9th, 2010 | 1 Comments
    Almanahe.b is a worm that spreads by infecting executable files on any local, removable or mapped network driv...

  • Almanahe c December 20th, 2007 | No Comments
    Almanahe.c is a worm that spreads by infecting executable files on any local, removable or mapped network driv...

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Worms replicate themselves and infect a computer without user knowledge and consent. There are three major ways these unsolicited parasites can get into the system.

1. Some parasites called mass-mailing worms propagate through e-mail. They arrive in files attached to e-mail messages or come embedded into letters. Once the user opens such a letter or file the worm silently installs itself to the system. The user cannot notice anything suspicious, as a parasite does not display any setup wizards, dialogs or warnings.
2. Widely spread worms infect vulnerable computer on the Internet by exploiting known operating system and installed software security vulnerabilities. Such parasite spread on their own and therefore do not require any user interference.
3. Many worms distribute themselves in infected files that arrive attached to instant messages or can be downloaded from file sharing networks or unprotected network shares. Such worms spread the infection in files with meaningful names in order to trick the user into executing them. Once the user opens a file, the worm silently infects a computer.

Worms affect mostly computers running Microsoft Windows operating system.


- Uses a compromised system to spread through e-mail, file sharing networks, instant messenger, online chats or unprotected network shares.
- Infects files, corrupts installed applications and damages the entire system.
- Steals or discloses sensitive personal information, valuable documents, passwords, login names, identity details and user contacts.
- Installs a backdoor or drops other dangerous parasite.
- Modifies essential system settings in order to decrease overall system security and make it more vulnerable.
- Severely degrades Internet connection speed and overall system performance, causes software instability. Some parasites are badly programmed, they waste too much computer resources and conflict with installed applications.
- Provides no uninstall feature, hides processes, files and other objects in order to complicate its removal as much as possible.


There are thousands of different computer worms. The following examples illustrate how treacherous and harmful worms can be.

Melissa is an infamous mass-mailing worm that was first found in the early 1999. It comes attached to e-mail messages and looks like a text document. However, when a user opens such an attachment, the worm silently installs itself to the system and starts to spread. It modifies Microsoft Word settings and infects lots of text documents. Then it sends out infected documents attached to e-mails to all the contacts from the address book. These actions disclose user's personal information and other confidential data. The worm sends out huge amount of infected letters and can overload mail servers. Some Melissa variants delete critical system files and therefore damage the entire system.

ILoveYou, also known as LoveLetter and Love Bug,  is perhaps the most widely-known worm in all history of worms. It struck the computer world in 2000, and infected a big number of systems all over the world. ILoveYou spreads through email as an attachment to the letters. But the text of the letters seems so nice and sweet that users open attachments without even thinking that there could be a virus. The text of e-mail may contain words like “I love you” and everything that is similar to that. ILoveYou spreads very fast, because when it gets to the system, it immediately sends its copies to all the addresses from the Microsoft Outlook Express address book. It also harms the system, by overwriting essential system files, user personal documents, multimedia files and other critical data. Some ILoveYou variants are responsible for a Denial of Service attack on the official White House web site.

Sobig is an Internet worm, which spreads by e-mail in letters with infected attachments. Once such attachment is executed, the worm installs itself to the system and distributes itself to e-mail addresses found in files of several types. It also infects vulnerable computers with shared resources in a local network. Sobig contains a backdoor, which can be used to update it or install additional plugins. Although this worm can cause a high overload of mail servers, it is outdated and doesn't spread now. However, its backdoor can still be active and may be used by attackers. Sobig is responsible for millions of infections around the world in 2003.

MyDoom, also known as Novarg, Shimgapi and Mimail, is the fastest spreading worm ever. The parasite propagates by e-mail and through file sharing networks. It comes in infected files attached to e-mail messages that trick the user into believing that they were sent by regular mail servers as delivery error notifications. Once the user executes such a file, MyDoom silently installs itself to the system and runs its payload. The worm sets up a backdoor that gives the remote attacker full unauthorized access to a compromised computer and performs a Denial of Service attack against SCO and Microsoft companies web sites. It also blocks access to several reputable domains. MyDoom is responsible for significant worldwide Internet performance slowdown that took place in the beginning of 2004. One in ten of all e-mail messages at that time contained a copy of the parasite.

The Sasser worm is an infamous Internet parasite that infects vulnerable computers running systems with unfixed security breaches. It doesn't distribute itself by e-mail or some networks, but infects computers directly and doesn't depend on the user's actions. Sasser installs itself to the system and searches for other vulnerable hosts. The worm can hang the infected computer or reboot it frequently. It also severely compromises the security of infected systems, so the attackers are able to connect and control them remotely.


Most Internet worms spread through e-mail, file sharing networks or unprotected network shares. This distribution method noticeably decreases overall computer performance and degrades Internet connection speed. The user, which computer is infected with a worm, usually have multiple web surfing problems, system instability and software unreliability issues. Moreover, his computer becomes the source of infection and poses serious threat to other hosts over the Internet or in a local network.

Many worms attempt to decrease system security by modifying security-related application settings, turning off antivirus or anti-spyware protection. Some parasites drop even more dangerous security and privacy threats such as various backdoors or trojans. The remote attacker can use these pests to gain full unauthorized access to a compromised computer, steal user sensitive information or totally destroy the entire system and all user data.

A worm by itself is a great privacy risk. Lots of these parasites are designed specially to collect valuable user information like passwords, bank account details, credit card numbers or identity data and silently transfer it to the attacker. Some worms are made for criminal purposes. They are created to infect computers of corporate users and steal or disclose to public secret documents and other confidential information.


Worms work in the same manner as the regular computer viruses and therefore can be found and removed with the help of effective antivirus products like Symantec Norton AntiVirus, Kaspersky Anti-Virus, McAfee VirusScan, eTrust EZ Antivirus, Panda Titanium Antivirus, AVG Anti-Virus. Some advanced spyware removers, which are able to scan the system in a similar way antivirus software does and have extensive parasite signature databases can also detect and remove certain worms and related malicious components. Powerful anti-spyware solutions such as Microsoft AntiSpyware Beta, Spyware Doctor, Ad-Aware SE, SpyHunter or eTrust PestPatrol are known for quite fair worm detection and removal capabilities.

In some cases even an antivirus or spyware remover can fail to get rid of a particular worm. That is why there are Internet resources such as 2-Spyware.com, which provide manual malware removal instructions. These instructions allow the user to manually delete all the files, directories, registry entries and other objects that belong to a parasite. However, manual removal requires fair system knowledge and therefore can be a quite difficult and tedious task for novices.

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