W32.Darby.B

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Discovered: October 18, 2004
Updated: February 13, 2007 12:28:47 PM
Also Known As: W32.HLLW.Darby, Worm.P2P.Darby.o [Kaspersky], WORM_DARBY.O [Trend Micro], W32/Darby.gen [McAfee]
Type: Worm
Systems Affected: Windows


W32.Darby.B is a worm that uses file-sharing networks, email, network file sharing, and Internet Relay Chat (IRC) to spread. The worm may also attempt to disable antivirus and firewall software.

Note: Virus Definitions dated prior to October 18, 2004 may detect this threat as W32.HLLW.Darby.



Manually reversing the changes that were made to the registry
Because the worm modified the registry so that you cannot (or should not) run any .exe files, first make a copy of the Registry Editor as a file with the .com extension, and then run that file.

  1. Do one of the following, depending on the version of Windows you are running:
    • Windows 95/98 users:
      1. Click Start.
      2. Point to Programs.
      3. Click the MS-DOS Prompt. (A DOS window opens at the C:\Windows prompt.) Proceed with step B of this section.

    • Windows Me users:
      1. Click Start.
      2. Point to Programs.
      3. Point to Accessories.
      4. Click the MS-DOS Prompt. (A DOS window opens at the C:\Windows prompt.) Proceed with step B of this section.

    • Windows NT/2000 users:
      1. Click Start > Run.
      2. Type command, and then press Enter. (A DOS window opens.)
      3. Type cd \winnt, and then press Enter.
      4. Proceed with step B of this section.

    • Windows XP users:
      1. Click Start > Run.
      2. Type command, and then press Enter. (A DOS window opens.)
      3. Type the following:

        cd\
        cd \windows

        Press Enter after typing each one.

      4. Proceed with step B of this section.

  2. Type copy regedit.exe regedit.com

    and then press Enter.

  3. Type start regedit.com

    and then press Enter. (The Registry Editor opens in front of the DOS window.)

    After you finish editing the registry, exit the Registry Editor, and then exit the DOS window as well.

  4. Before continuing, 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 keys only. For instructions, read the document, "How to make a backup of the Windows registry."

  5. Navigate to and select the key:

    HKEY_LOCAL_MACHINE\Software\Classes\exefile\shell\open\command

    NOTE: The HKEY_LOCAL_MACHINE\Software\Classes key contains many subkey entries that refer to other file extensions. One of these file extensions is .exe. Changing this extension can prevent any files ending with a .exe extension from running. Make sure that you completely browse through this path until you reach the \command subkey.

    Modify the HKEY_LOCAL_MACHINE\Software\Classes\exefile\shell\open\command subkey, shown in the following figure:


    <<=== NOTE: Modify this key.

  6. In the right pane, double-click the (Default) value.
  7. Delete the current value data, and then type:

    "%1" %*

    That is, type the characters: quote-percent-one-quote-space-percent-asterisk.

    NOTES
    • Under Windows 95/98/Me/NT, the Registry Editor automatically encloses the value within quotation marks. When you click OK, the (Default) value should look exactly like this:

      ""%1" %*"  
    • Under Windows 2000/XP, the additional quotation marks will not appear. When you click OK, the (Default) value should look exactly like this:

      "%1" %*
    • Make sure that you completely delete all the value data in the command key before typing the correct data. If you leave a space at the beginning of the entry, any attempt to run the program files will result in the error message, "Windows cannot find .exe." If this occurs, restart the entire process from the beginning of this documentand make sure that you completely remove the current value data.

  8. Exit the Registry Editor.


Antivirus Protection Dates

  • Initial Rapid Release version October 18, 2004
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version October 18, 2004
  • Latest Daily Certified version August 20, 2008 revision 016
  • Initial Weekly Certified release date October 20, 2004

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

Writeup By: Candid Wueest

Discovered: October 18, 2004
Updated: February 13, 2007 12:28:47 PM
Also Known As: W32.HLLW.Darby, Worm.P2P.Darby.o [Kaspersky], WORM_DARBY.O [Trend Micro], W32/Darby.gen [McAfee]
Type: Worm
Systems Affected: Windows


When W32.Darby.B is executed, it does the following:

  1. Displays one of the following fake error messages in English or Spanish (depending on the language settings of the target host):
    • The file this total or partially damaged, impossible to open the file.
    • El archivo esta total o parcialmente danado, imposible abrir el archivo.

  2. Creates one or more copies of itself in %System% folder using one of the following file names:
    • NETRUNDLDRV
    • XPWIEKLIBl
    • WINDEFRAGUPD
    • IMAGE0X
    • KILLUSA
    • MICROROUTESTAT
    • DOSRUNDLDLL
    • CDGGROUPS386

      The files will have .com, .exe, .pif, or .scr file extensions.

      Note: %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  3. Adds the value:

    "[random worm filename]" = "%System%\[random worm filename]"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Run

    so that the worm runs when Windows starts.

  4. Adds the value:

    "[Default]" = "[path to worm] "%1" %*"

    to the registry keys:
    • HKEY_LOCAL_MACHINE\Software\CLASSES\batfile\shell\open\command
    • HKEY_LOCAL_MACHINE\Software\CLASSES\comfile\shell\open\command
    • HKEY_LOCAL_MACHINE\Software\CLASSES\exefile\shell\open\command
    • HKEY_LOCAL_MACHINE\Software\CLASSES\piffile\shell\open\command
    • HKEY_LOCAL_MACHINE\Software\CLASSES\scrfile\shell\open\command

      so that the worm runs when you run the files with the .bat, .com, .exe, .pif, and .scr extensions.

  5. Adds the value:

    "StubPath" = "[path to worm]"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\Bardiel

  6. Adds the value:

    "Shell" = "Explorer.exe [path to worm]"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

  7. Adds the value:

    "run" = "%System%\[random worm filename]"

    to the registry key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows

    so that it runs every time Windows starts.

  8. Adds the values:

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

    to the registry keys:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
    Policies\System
    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Policies\System

    which disables the use of the registry editor and task manager.

  9. Adds the value:

    "(Default)" = "GDC"

    to the registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\regfile\shell\open\command
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\keyfile\shell\open\command

    which disables the use of the registry editor and task manager.

  10. Adds the value:

    "Timeout"="0"

    to the registry key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows Scripting\Host\Settings

  11. Modifies the Autoexec.bat file by appending the following line to hook system startup:

    @win %System%\[random worm filename]

  12. Modifies the Win.ini file by adding the following to the [windows] section of the file:

    run=%System%\[random worm filename]

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

  13. Modifies %Windir%\system.ini, adding the following to the [boot] section:

    shell=Explorer.exe %System%\[random worm filename]

  14. Creates the following registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\GedzacLABS\Bardiel.d
    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\GEDZAC LABS

  15. Registers itself as a service using the name "GEDZAC LABS"

  16. Creates the following data files:
    • \Bardiel.hta
    • %Temp%\bh.dat
    • %Temp%\bm.dat
    • %Windir%\microsoftweb.htm
    • %System%\BZIP.EXE
    • %System%\GZIP.ZIP

      Note: %Temp% is a variable that refers to the Windows temporary folder. By default, this is C:\Windows\TEMP (Windows 95/98/Me/XP) or C:\WINNT\Temp (Windows NT/2000).

  17. Modifies the values:
    • "Message Send HTML" = "1"
    • "Stationery Name" = "%Windows%\microsoftweb.htm"
    • "Wide Stationery Name" = "%Windows%\microsoftweb.htm"

      to the registry keys:

      HKEY_CURRENT_USER\Identities\[variable key]\Software\Microsoft\
      Outlook Express\5.0\Mail
      HKEY_CURRENT_USER\Identities\[variable key]\Software\Microsoft\
      Outlook Express\Mail\
      HKEY_CURRENT_USER\Identities\[variable key]\Software\Microsoft\
      Outlook Express\6.0\Mail

  18. Modifies the values:
    • "NewStationery" = "dword:00000000"
    • "EditorPreference" = "dword:00020000"

      to the registry keys:

      HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Common\MailSettings
      HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Options\Mail
      HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Common\MailSettings
      HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Options\Mail
      HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Common\MailSettings
      HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Outlook\Options\Mail
      HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Common\MailSettings
      HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Options\Mail
      HKEY_CURRENT_USER\Software\Microsoft\Office\Common\MailSettings
      HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Options\Mail

      so that Microsoft Outlook Express attaches a copy of microsoftweb.htm to each email as a signature:

  19. The microsoftweb.htm file exploits the Microsoft Outlook IFrame Embedded URL vulnerability, which may download files from a remote server when viewed.

  20. The worm will also search for cached passwords and send them out using email.

  21. Next the worm copies itself to the shared folders of the following file-sharing applications and may modify registry keys to ensure that the folder is shared:
    • AppleJuice
    • BearShare
    • eDonkey
    • ICQ
    • Filetopia
    • FileNavigator
    • Gnucleus
    • Grokster
    • iMesh
    • Kazaa
    • Morpheus
    • Shareaza
    • LimeWire
    • Soulseek

      The worm uses the following file names:
    • ACDSee 5.5.exe
    • AOL Instant Messenger.exe
    • AVP Antivirus Pro Key Crack.exe
    • Age of Empires 2 crack.exe
    • Ana Kournikova Sex Video.exe
    • Animated Screen 7.0b.exe
    • Aol cracker.exe
    • Aol password cracker.exe
    • AquaNox2 Crack.exe
    • Audiograbber 2.05.exe
    • BabeFest 2003 ScreenSaver 1.5.exe
    • Babylon 3.50b reg_crack.exe
    • Battlefield1942_bloodpatch.exe
    • Battlefield1942_keygen.exe
    • Britney Spears Sex Video.exe
    • Buffy Vampire Slayer Movie.exe
    • Business Card Designer Plus 7.9.exe
    • Cable modem ultility pack.exe
    • Clone CD 5.0.0.3 (crack).exe
    • Clone CD 5.0.0.3.exe
    • Coffee Cup Free exe
    • Cool Edit Pro v2.55.exe
    • Counter-strike.exe
    • Crack Passwords Mail.exe
    • Credit Card Numbers generator(incl Visa,MasterCard,...).exe
    • Cristina Aguilera Sex Video.exe
    • DVD Copy Plus v5.0.exe
    • DVD Region-Free 2.3.exe
    • Delphi.exe
    • Diablo 2 Crack.exe
    • DirectDVD 5.0.exe
    • DirectX Buster (all versions).exe
    • DirectX InfoTool.exe
    • DivX Video Bundle 6.5.exe
    • Divx pro.exe
    • Divx_pro.exe
    • Download Accelerator Plus 6.1.exe
    • Edonkey2000-Speed me up scotty.exe
    • FIFA2003 crack.exe
    • Final Fantasy VII XP Patch 1.5.exe
    • Flash MX crack (trial).exe
    • FlashGet 1.5.exe
    • FreeRAM XP Pro 1.9.exe
    • GTA 3 Crack.exe
    • GTA 3 Serial.exe
    • Game Cube Real Emulator.exe
    • GetRight 5.0a.exe
    • Global DiVX Player 3.0.exe
    • Gothic2 licence.exe
    • Guitar Chords Library 5.5.exe
    • Hentai Anime Girls Movie.exe
    • Hitman_2_no_cd_crack.exe
    • Hot Babes XXX Screen Saver.exe
    • HotGirls.exe
    • Hotmail Hacker 2003-Xss Exploit.exe
    • Hotmail_hack.exe
    • ICQ Pro 2003a.exe
    • ICQ Pro 2003b (new beta).exe
    • IMesh 3.6.exe
    • IMesh 3.7b (beta).exe
    • IrfanView 4.5.exe
    • Jenifer Lopez Sex Video.exe
    • KaZaA Hack 2.5.0.exe
    • KaZaA Speedup 3.6.exe
    • Kazaa SDK + Xbit speedUp for 2.xx.exe
    • Links 2003 Golf game (crack).exe
    • Living Waterfalls 1.3.exe
    • MIRC 6.40.exe
    • MSN Messenger 5.2.exe
    • Macromedia dreamweaver key generator.exe
    • Mafia_crack.exe
    • Matrix Movie.exe
    • Matrix Screensaver 1.5.exe
    • Mcafee Antivirus Scan Crack.exe
    • MediaPlayer Update.exe
    • Microsoft KeyGenerator-Allmost all microsoft stuff.exe
    • Mp3Trim PRO 2.5.exe
    • NBA2003_crack.exe
    • NHL 2003 crack.exe
    • Need 4 Speed crack.exe
    • Nero Burning ROM crack.exe
    • Netbios Nuker 2003.exe
    • Netfast 1.8.exe
    • Network Cable e ADSL Speed 2.0.5.exe
    • Nimo CodecPack (new) 8.0.exe
    • Norton Anvirus Key Crack.exe
    • PS2 PlayStation Simulator.exe
    • PalTalk 5.01b.exe
    • Pamela_anderson.exe
    • Panda Antivirus Titanium Crack.exe
    • Play station emulator.exe
    • Pop-Up Stopper 3.5.exe
    • Popup Defender 6.5.exe
    • Quick Time Key Crack.exe
    • QuickTime_Pro_Crack.exe
    • Sakura Card Captor Movie.exe
    • Screen saver christina aguilera naked.exe
    • Screen saver christina aguilera.exe
    • Security-2003-Update.exe
    • Serials 2003 v.8.0 Full.exe
    • Serials2000.exe
    • Sex Live Simulator.exe
    • Sex Passwords.exe
    • SmartFTP 2.0.0.exe
    • SmartRipper v2.7.exe
    • Space Invaders 1978.exe
    • Spiderman Movie.exe
    • Splinter_Cell_Crack.exe
    • Starcraft serial.exe
    • Start Wars Trilogy Movies.exe
    • Steinberg_WaveLab_5_crack.exe
    • Stripping MP3 dancer+crack.exe
    • Subseven.exe
    • Thalia Sex Video.exe
    • Trillian 0.85 (free).exe
    • TweakAll 3.8.exe
    • UT2003_bloodpatch.exe
    • UT2003_keygen.exe
    • UT2003_no cd (crack).exe
    • UT2003_patch.exe
    • Unreal2_bloodpatch.exe
    • Unreal2_crack.exe
    • VB6.exe
    • Virtua Girl (Full).exe
    • Virtua girl - adriana.exe
    • Virtua girl - bailey short skirt.exe
    • VirtualSex.exe
    • Visual Basic 6.0 Msdn Plugin.exe
    • Visual basic 6.exe
    • WarCraft_3_crack.exe
    • Warcraft 3 crack.exe
    • Warcraft 3 serials.exe
    • WinOnCD 4 PE_crack.exe
    • WinRar 3.xx Password Cracker.exe
    • WinZip 9.0b.exe
    • WinZipped Visual C++ Tutorial.exe
    • Winamp 3.8.exe
    • Winamp plugin pack.exe
    • WindowBlinds 4.0.exe
    • Windows XP complete + serial.exe
    • Windows Xp Exploit.exe
    • Winzip KeyGenerator Crack.exe
    • Winzip full version key generator.exe
    • XNuker 2003 2.93b.exe
    • Yahoo Messenger 6.0.exe
    • Zelda Classic 2.00.exe

  22. Attempts to disable antivirus and firewall software by terminating predetermined processes and deleting files.

  23. Creates a script file with a random name and adds it to the mirc.ini file list, so that the worm is sent using DCC commands.

  24. May attempt to download and execute malicious files from a remote source on the Internet.

  25. Attempts to access network shares using predetermined user names and passwords. If successful, the worm will copy itself to the share.

  26. Emails itself to contacts in the Microsoft Outlook address book and addresses that it finds in local files with the following extensions:
    • .txt
    • .php
    • .asp
    • .ht*

      The worm ignores email addresses that contain certain predetermined strings.


      The email has the following characteristics:

      From: (Spoofed)

      Subject: (One of the following)
    • 1 Fantasmas
    • 11 Ghosts
    • 7 Days
    • 7 Dias
    • A Gift
    • Adiviananzas y Trivias
    • Areas
    • As much as they love you?
    • Bardiel
    • Buscas Amistad o Amor?
    • Chupayruna
    • Ciber Girls
    • Confirmacion de Suscripcion
    • Confirmation Gives Suscription
    • Conoces la Dimension Desubicada?
    • Cuanto te aman?
    • Cuentas Hack
    • For You
    • GEDZAC Targeta
    • GEDZAC postcard
    • GamesOnLine
    • Greetings
    • Informacion
    • Information
    • Invitacion
    • Invitation
    • La Profecia del Vampiro
    • Lamb Goes he Goes
    • Las fotos mas hot
    • Love
    • Magia
    • Magic
    • Mail Delivery Return System
    • Manual de Seduccion
    • Manual gives Secuction
    • Microsoft Internet Explorer
    • Models
    • Nostradamus and The Torres Twins
    • Nostradamus y Las Torres Gemelas
    • Odisea
    • Odyssey
    • Para Ti
    • Que Foto :)
    • Riddles and Tribias
    • Sadness :(
    • Saludos
    • Series, Movies, novels
    • Series, Peliculas, Telenovelas
    • SexSimulator
    • Sin Miedo
    • That picture :)
    • The First
    • The Master
    • The Pictures but Hot
    • The Prophecy gives the Vampire
    • Tristeza :(
    • Un Regalo
    • Utopia
    • Va Cordero Va
    • Without Fear
    • Zonas
    • do you Know the Dimension Desubicada?
    • do you Look for Friendship or Love?
    • you Count Hack


      Attachment: (One of the following)
    • (Demo).pif
    • _msg.zip
    • 10Claves.zip
    • 11Fantasmas.scr
    • 11Ghosts.scr
    • 16Playboy.zip
    • Angel.scr
    • AutoAyuda.pif
    • Bardiel
    • beso.zip
    • Boletin N.205.com
    • Bulletin N.205.com
    • Carta.scr
    • Chupayruna.scr
    • CiberGirls.pif
    • Crack.bat
    • CrazyTest.zip
    • CuentasPWL.pif
    • CwshredderPlus.zip
    • Day.scr
    • Dibujitos.zip
    • DimensionDesubicada.scr
    • Drawings.zip
    • E-Card.zip
    • EL-Card.zip
    • finder.bat
    • Fotos.scr
    • F**kSanta.zip (censored)
    • HackHotmail.zip
    • Help.pif
    • Ideal.zip
    • IlusionI.zip
    • Image.pif
    • Kiss.zip
    • Letter.scr
    • Lie.zip
    • MailFile.bat
    • ManualMagia.bat
    • ManualMagic.bat
    • ManualSec.pif
    • ManualSeduction.pif
    • Microsoft Bulletin 200.com
    • NoMentir.zip
    • Nostradamus.pif
    • Osama.zip
    • Ph0t0.zip
    • Pictures.scr
    • PornStars.zip
    • Profecia.pif
    • prophecy.pif
    • QueRaro.zip
    • QueRaro.zip
    • Realidad.bat
    • Reality.bat
    • Registro.zip
    • Registry.zip
    • ReturnMsg.zip
    • RptAcertijos.zip
    • Seduc.zip
    • Sex_Tantra.zip
    • SexSimulator.exe
    • SigName.zip
    • SigNombre.zip
    • Slayer.pif
    • TestG.zip
    • TestLove.pif
    • TestRayado.zip
    • TF.pif
    • Trivia.bat
    • TuFoto.pif
    • TuFuturo.zip
    • videoClip.zip
    • Virtual0034.zip
    • Visor.bat
    • www.EnterTvRed.com
    • www.ftpfree.com
    • www.gmol.com
    • www.Models.com
    • www.ModelsALLg.com
    • www.rdA.com
    • www.XImage.com
    • WWW.XIMAGE.COM
    • xImages.zip
    • YourPicture.pif
    • ZALIA.zip


Recommendations

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: Candid Wueest

Discovered: October 18, 2004
Updated: February 13, 2007 12:28:47 PM
Also Known As: W32.HLLW.Darby, Worm.P2P.Darby.o [Kaspersky], WORM_DARBY.O [Trend Micro], W32/Darby.gen [McAfee]
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. Disable System Restore (Windows Me/XP).
  2. Use the Security Response "Tool to reset shell\open\command registry keys."
  3. Update the virus definitions.
  4. Restart the computer in Safe mode or VGA mode.
  5. Run a full system scan and delete all the files detected as W32.Darby.B.
  6. Re-enable registry access.
  7. Reverse the changes made to the registry.
  8. Edit the Win.ini and Autoexec.bat files
For details on each of these steps, read the following instructions.

1. 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:

Note:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, re-enable 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.

2. To use the Security Response "Tool to reset shell\open\command registry keys."

W32.Darby.B makes changes to the Windows registry that may prevent you from running the registry editor. 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.

If you cannot obtain the tool, refer to the "Additional Information" section for information on manually reversing the changes.
3. 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 the 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 the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

4. To restart the computer in Safe mode or VGA mode

Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
  • For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
  • For Windows NT 4 users, restart the computer in VGA mode.
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 as infected with W32.Darby.B, click Delete.

6. To re-enable registry access

If registry access has been disabled, do the following:
  1. Click Start > Run.
  2. Type:

    Notepad

    and then click OK.

  3. Type, or copy and paste, the following text into the text file:

    REGEDIT4
    [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]
    "DisableRegistryTools"=dword:00000000
    [HKEY_CURRENT_USER\Software\Microsoft\WindowsNT\CurrentVersion\Policies\System]
    "DisableRegistryTools"=dword:00000000

  4. Save the file as C:\Repair.reg.

  5. Click Start > Run.

  6. Type:

    regedit -s C:\repair.reg

    and then click OK.

7. To reverse the changes made to 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 keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.

  1. Click Start > Run.
  2. Type regedit

    Then click OK.

  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Run

  4. In the right pane, delete the value:

    "[random worm filename]" = "%System%\[random worm filename]"

  5. Exit the Registry Editor.

  6. Restart the computer in Normal mode. For instructions, read the section on returning to Normal mode in the document, "How to start the computer in Safe Mode."

8. To edit the Win.ini and Autoexec.bat files
If you are running Windows 95/98/Me, follow these steps:
  1. Click Start > Run.
  2. Type the following:

    edit c:\windows\win.ini

    and then click OK.

    (The MS-DOS Editor opens.)

    NOTE: If Windows is installed in a different location, make the appropriate path substitution.

  3. In the [windows] section of the file, look for a line similar to:

    shell=Explorer.exe %System%\[random worm filename]

  4. If this line exists, delete everything to the right of run=

  5. Click File > Save.

  6. Click File > Exit.

  7. Click Start > Run.

  8. Type the following:

    edit c:\autoexec.bat

    and then click OK.

    NOTE: If Windows is installed in a different location, make the appropriate path substitution.

  9. Look for a line similar to:

    @win %System%\[random worm filename]

  10. If this line exists, delete it.

  11. Click File > Save.
  12. Click File > Exit.


Writeup By: Candid Wueest