Discovered: September 30, 2005
Updated: February 13, 2007 12:45:26 PM
Type: Worm
Systems Affected: Windows

W32.Lile.A is a file infector worm that can spread by copying itself into local folders and mapped network drives, infecting files inside peer-to-peer transfer folders and through Instant Messaging programs. The worm also can download and execute remote files and tries to perform a denial of service against a specific Web site.

Antivirus Protection Dates

  • Initial Rapid Release version October 13, 2005
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version October 13, 2005
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date October 17, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Elia Florio

Discovered: September 30, 2005
Updated: February 13, 2007 12:45:26 PM
Type: Worm
Systems Affected: Windows

When W32.Lile.A is executed, it performs the following actions:

  1. Creates some of the following files in the %SystemDrive% and periodically checks for their presence as an infection marker:

    • C:\vi.inf
    • C:\Leliel.hta
    • %Windir%\Wininit.ini

      Note: %SystemDrive% is a variable that refers to the drive on which Windows is installed. By default, this is drive C.

  2. Creates the following mutex so that only one copy of the threat will run on the compromised computer:


  3. Drops the following copies of itself:

    • C:\LEL.EXE
    • %Windir%\MSRunDll32.exe

      Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

  4. Creates a file named C:\l.reg.

  5. Runs the Windows registry utility using the following command:

    regedit /s c:\l.reg

  6. Modifies the value:

    "(default)" = "%Windir%\MSRundll32.exe "%1" %*"

    in the registry subkeys:


    so that the worm runs every time the user opens a .exe or .reg file.

  7. Adds the value:

    "(default)" = "%Windir%\MSRundll32.exe "%1" %*"

    to the registry subkeys:


    so that the worm runs every time the user browses local folders.

  8. Attempts to disable the Windows Firewall by running the following external command:

    net stop SharedAccess

  9. Modifies the values:

    "DisableRegistryTools" = "1"
    "DisableTaskMgr" = "1"

    in the registry subkey:


    to disable the Registry Editor and Task Manager.

  10. Modifies the values:

    "DisableSR" = "1"

    in the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion

    to disable the System Restore security feature.

  11. Modifies the value:

    "SFCDisable" = "1"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\Microsoft\Windows NT\CurrentVersion\Winlogon

    to disable the Windows File Protection (SFC) security feature.

  12. Infects .exe files by prepending its code and copying the original file at the end. All infected files have the string "BORG" at the end as an infection marker.

    Note: The worm will not infect any files located in the %Windir% and %ProgamFiles% folders and avoids infecting mirc.exe.

  13. Writes the following text to the file C:\hst.sys. The worm also appends the text to the Windows hosts file to disable access to several security-related Web sites:

  14. Attempts to end any running processes which contain any of the following strings:

    • avg
    • avp
    • bitdefender
    • clean
    • firewall
    • mcafee
    • norman
    • norton
    • panda
    • process
    • remover
    • security
    • shopos
    • symantec
    • thav
    • the hacker
    • trojan
    • troyan
    • virus

  15. Ends any running process that is opening or editing an infected file and then deletes the file associated with the process.

  16. Attempts to spread to a randomly selected drives, except the C drive, using one of the following methods:

    Method One:

    It may copy the files AUTORUN.INF and GEDZAC.EXE into the %SystemDrive%. AUTORUN.INF tries to execute the worm when a user accesses the drive. GEDZAC.EXE changes the %Windir%\win.ini file so that it executes the worm when the compromised computer starts.

    Method Two:

    It may copy itself into the %SystemDrive% using one of the following names:

    • Yanet.jpg.pif
    • RutaDelPlacer.doc.pif
    • dibujitos.jpg.pif
    • Image012.jpg.pif
    • PrimeraCita.txt.pif

      Method Three:

      It may copy itself to one of the following folders, which may be start up folders in the %SystemDrive% for non-English language Windows Operating Systems:

    • Docume~1\AllUse~1\KSynni~1\Ohjelmat\KSynni~1
    • Docume~1\AllUse~1\MenuAv~1\Progra~1\Esecuz~1
    • Docume~1\AllUse~1\MenuDT~1\Progra~1\DTmarr~1
    • Docume~1\AllUse~1\MenuIn~1\Progra~1\Iniciar
    • Docume~1\AllUse~1\MenIn~1\Progra~1\Inicio
    • Docume~1\AllUse~1\MenuSt~1\Progra~1\Opstar~1
    • Docume~1\AllUse~1\MenuSt~1\Programy\Autost~1
    • Docume~1\AllUse~1\Menuen~1\Progra~1\Start
    • Docume~1\AllUse~1\StartM~1\Progra~1\BASLANGI
    • Docume~1\AllUse~1\StartM~1\Programs\StartUp
    • Docume~1\AllUse~1\Start-~1\Progra~1\Oppstart
    • Docume~1\AllUse~1\Start-~1\Program\Autost~1
    • Dokume~1\AllUse~1\Startmen\Progra~1\Autost~1

  17. Spreads on peer-to-peer networks by searching and infecting executable files located in any of the following folders:

    • [DRIVE LETTER]:\Ares Lite Edition\My Shared Folder
    • [DRIVE LETTER]:\Ares\My Shared Folder
    • [DRIVE LETTER]:\appleJuice\incoming
    • [DRIVE LETTER]:\eDonkey2000\incoming
    • [DRIVE LETTER]:\Gnucleus\Downloads
    • [DRIVE LETTER]:\Grokster\My Grokster
    • [DRIVE LETTER]:\ICQ\shared files
    • [DRIVE LETTER]:\Kazaa\My Shared Folder
    • [DRIVE LETTER]:\KaZaA Lite\My Shared Folder
    • [DRIVE LETTER]:\LimeWire\Shared
    • [DRIVE LETTER]:\morpheus\My Shared Folder
    • [DRIVE LETTER]:\Overnet\incoming
    • [DRIVE LETTER]:\Shareaza\Downloads
    • [DRIVE LETTER]:\Swaptor\Download
    • [DRIVE LETTER]:\WinMX\My Shared Folder
    • [DRIVE LETTER]:\Tesla\Files
    • [DRIVE LETTER]:\XoloX\Downloads
    • [DRIVE LETTER]:\Rapigator\Share
    • [DRIVE LETTER]:\KMD\My Shared Folder
    • [DRIVE LETTER]:\BearShare\Shared
    • [DRIVE LETTER]:\Direct Connect\Received Files
    • [DRIVE LETTER]:\eMule\Incoming
    • [DRIVE LETTER]:\Kazaa Lite K++\My Shared Folder
    • [DRIVE LETTER]:\Kazaa Lite Resurrection\My Shared Folder

      Where [DRIVE LETTER] is a random drive chosen from C to Z.

  18. Attempts to obtain full access to the mapped network folders using the following list of passwords:

    • !@#$
    • !@#$%
    • !@#$%^
    • !@#$%^&
    • !@#$%^&*
    • !@#$%^&*(
    • !@#$%^&*()
    • %null%
    • %username%
    • %username%12
    • %username%123
    • %username%1234
    • 000000
    • 00000000
    • 09876
    • 111111
    • 11111111
    • 123
    • 1234
    • 12345
    • 123456
    • 1234567
    • 12345678
    • 1234qwer
    • 123abc
    • 123asd
    • 123qwe
    • 5201314
    • 54321
    • 654321
    • 888888
    • 88888888
    • abc
    • abc123
    • abcd
    • abcdef
    • admin
    • administrador
    • asd123
    • asdf
    • asdfgh
    • computer
    • database
    • default
    • intel
    • internet
    • manager
    • master
    • oracle
    • pass
    • passwd
    • password
    • private
    • public
    • qwerty
    • root
    • secret
    • security
    • server
    • sexo
    • super
    • sybase
    • test
    • user
    • usuario
    • xxx
    • xyz

  19. Spreads using Instant Messaging programs by searching for specific Instant Messaging folders, which is carried out by reading the following registry subkeys:

    HKEY_CURRENT_USER\Software\America Online\AOL Instant Messenger (TM)\CurrentVersion\Users

  20. Creates the file %Windir%\ and copies it into the gathered Instant Messaging folders with one of the following names:
    • mi
    • Mi

      The ZIP archive contains a file named image.jpg.[MANY BLANK SPACES].exe.

  21. Makes more copies of %Windir%\ into the folder %Windir%\ymsg with the following names:
    • %Windir\ymsg\
    • %Windir\ymsg\mi
    • %Windir\ymsg\Mi
    • %Windir\ymsg\
    • %Windir\ymsg\

      The ZIP archive contains a file named image.jpg.[MANY BLANK SPACES].exe.

  22. Spreads over Instant Messaging by hijacking the current chat window of Yahoo! Messenger and AIM and inserting an embedded link with one of the following messages:

    • Mira esta foto [INFECTED LINK]
    • Bajate este video esta bueno [INFECTED LINK]
    • Mira la Foto del ChupaCabras [INFECTED LINK]
    • Brasil Models Sex [INFECTED LINK]
    • Solo para mayores de 18 anos [INFECTED LINK]
    • De mi para ti [INFECTED LINK]
    • Angie y Mary conocenos [INFECTED LINK]
    • Que tan buen(a) amante eres? [INFECTED LINK]
    • Secretos Sexuales de Oriente [INFECTED LINK]
    • Misterios Urbanos descubrelos [INFECTED LINK]
    • Musica y videos rock romantica reggaeton salsa etc [INFECTED LINK]
    • Baja de peso rapidamente y mejora tu cuerpo [INFECTED LINK]
    • Autos y Chicas [INFECTED LINK]
    • Los Juegos Sexuales [INFECTED LINK]
    • Las Mujeres Mas infartantes [INFECTED LINK]
    • Gana Dinero Verdadero en Internet [INFECTED LINK]
    • Sexo en Vivo [INFECTED LINK]
    • Te Llama la Llama [INFECTED LINK]
    • Aprende a Hackear un mail [INFECTED LINK]
    • Foto de un ovni? decidelo tu [INFECTED LINK]
    • It watches this photo [INFECTED LINK]
    • It download east video this good [INFECTED LINK]
    • It watches the Photo of the ChupaCabras [INFECTED LINK]
    • Single for greater of 18 years [INFECTED LINK]
    • Of my for you [INFECTED LINK]
    • Angie and Mary to know [INFECTED LINK]
    • That so good lover you are? [INFECTED LINK]
    • Sexual secrets of East [INFECTED LINK]
    • Urban mysteries [INFECTED LINK]
    • Music and videos romantic rock reggaeton salsa etc [INFECTED LINK]
    • obsess you [INFECTED LINK]
    • Cars and Girls [INFECTED LINK]
    • The Sexual Games [INFECTED LINK]
    • The Women More uppers [INFECTED LINK]
    • It wins real money in Internet [INFECTED LINK]
    • Live sex [INFECTED LINK]
    • looks at the truth [INFECTED LINK]
    • It learns to Hackear a mail [INFECTED LINK]
    • Does picture give an ovni? decide it your [INFECTED LINK]

      Where [INFECTED LINK] is a link to one of the following URLs:

    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/
    • [http://][REMOVED]/

      Note: The file names in the links vary and the file extension in the link may be .avi, .jpg, .txt or nothing at all. It has been reported that the links are either: links to ads and pop ups, links to copies of the worm or no longer available at the time of writing.

  23. May try to send one of the following infected files directly to an Instant Messenger contact during a chat session, without using any specific link:

    • mi
    • Mi

  24. May randomly download a remote file to C:\lirc.exe and execute it. The file is downloaded from one of the following domains:


  25. Opens a back door using the mIRC client on standard IRC ports to connect to a predetermined IRC channel and waits for commands from the remote attacker to perform the following actions:

    • Download and execute files, some of which may be updated versions of the worm
    • Verify computer or network status
    • Provide confidential computer information

  26. Randomly activates the denial of service functionality which consists of an attack, issued every two seconds against the Web site on TCP port 80.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

Writeup By: Elia Florio

Discovered: September 30, 2005
Updated: February 13, 2007 12:45:26 PM
Type: Worm
Systems Affected: Windows

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Use the Security Response "Tool to reset shell\open\command registry subkeys."
  2. Remove all the entries that the risk added to the hosts file.
  3. Disable System Restore (Windows Me/XP).
  4. Update the virus definitions.
  5. Run a full system scan and delete all the files detected.
  6. Delete any values added to the registry.
  7. Reenable the SharedAccess service (Windows 2000/XP only)
For specific details on each of these steps, read the following instructions.

1. Using the Security Response "Tool to reset shell\open\command registry subkeys."
This risk makes changes to the Windows registry that may prevent you from running executable files. Security Response has developed a tool to reset these values to the default settings. This tool is the easiest way to fix this. Once you have run the tool , return to this page and continue with the removal.

2. To remove all the entries that the risk added to the hosts file
  1. Navigate to the following location:

    • Windows 95/98/Me:
    • Windows NT/2000/XP:

    • The location of the hosts file may vary and some computers may not have this file. There may also be multiple copies of this file in different locations. If the file is not located in these folders, search your disk drives for the hosts file, and then complete the following steps for each instance found.
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).

  2. Double-click the hosts file.
  3. If necessary, deselect the "Always use this program to open this program" check box.
  4. Scroll through the list of programs and double-click Notepad.
  5. When the file opens, delete all the entries added by the risk. (See the Technical Details section for a complete list of entries.)
  6. Close Notepad and save your changes when prompted.

3. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).

4. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to Virus Definitions (Intelligent Updater).

    The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.

5. To scan for and delete the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected, click Delete.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode . Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

6. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.
  1. Click Start > Run.
  2. Type regedit
  3. Click OK.

    Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

  4. Navigate to the subkey:


  5. In the right pane, restore the default values:

    "DisableRegistryTools" = "0"
    "DisableTaskMgr" = "0"

  6. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion

  7. In the right pane, restore the default value:

    "DisableSR" = "0"

  8. Navigate to and delete the following subkeys:


  9. Exit the Registry Editor.

7. To reenable the SharedAccess service (Windows 2000/XP only)
The SharedAccess service is responsible for maintaining Internet Connection Sharing and the Windows Firewall/Internet Connection Firewall applications in Windows. (The presence and names of these applications vary depending on the operating system and service pack you are using.) To protect your computer and maintain network functionality, re-enable this service if you are using any of these programs.

Windows XP Service Pack 2
If you are running Windows XP with Service Pack 2 and are using the Windows Firewall, the operating system will alert you when the SharedAccess service is stopped, by displaying an alert balloon saying that your Firewall status is unknown. Perform the following steps to ensure that the Windows Firewall is re-enabled:
  1. Click Start > Control Panel.

  2. Double-click the Security Center.

  3. Ensure that the Firewall security essential is marked ON.

    Note: If the Firewall security essential is marked on, your Windows Firewall is on and you do not need to continue with these steps.

    If the Firewall security essential is not marked on, click the "Recommendations" button.

  4. Under "Recommendations," click Enable Now. A window appears telling you that the Windows Firewall was successfully turned on.

  5. Click Close, and then click OK.

  6. Close the Security Center.

Windows 2000 or Windows XP Service Pack 1 or earlier
Complete the following steps to re-enable the SharedAccess service:
  1. Click Start > Run.
  2. Type services.msc

    Then click OK.

  3. Do one of the following:
    • Windows 2000: Under the Name column, locate the "Internet Connection Sharing (ICS)" service and double-click it.
    • Windows XP: Under the Named column, locate the "Internet Connection Firewall (ICF) / Internet Connection Sharing (ICS)" service and double-click it.

  4. Under "Startup Type:", select "Automatic" from the drop-down menu.

  5. Under "Service Status:", click the Start button.

  6. Once the service has completed starting, click OK.

  7. Close the Services window.

Writeup By: Elia Florio