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Discovered: August 29, 2003
Updated: February 13, 2007 12:06:32 PM
Also Known As: W32/Bardiel, Worm.P2P.VB.ai [KAV], W32/Darby.worm.c [McAfee]
Type: Worm
Systems Affected: Windows

W32.HLLW.Darby is a worm that spreads through file-sharing networks, such as KaZaA and Morpheus, and may also attempt to spread through email and IRC.

When this worm is executed, it displays a message box that states either "The file this total or partially damaged, impossible to open the file," or "El archivo esta total o parcialmente danado, imposible abrir el archivo."

This threat is written in Visual Basic and is packed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version September 02, 2003
  • Latest Rapid Release version May 07, 2019 revision 006
  • Initial Daily Certified version September 02, 2003
  • Latest Daily Certified version May 07, 2019 revision 008
  • Initial Weekly Certified release date September 03, 2003

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

Technical Description

When W32.HLLW.Darby is executed, it performs the following actions:

  1. Displays one of the following message boxes with a fake error message in either English or Spanish, depending on the language settings of the computer:
    • "The file this total or partially damaged, impossible to open the file."
    • "El archivo esta total o parcialmente danado, imposible abrir el archivo."

  2. Adds the value:

    "MicroLoad"="%System%\<random filename>"

    to the registry key:


    • The filename consists of seven random characters with a .bat, .scr, .exe, .com, or .pif extension.
    • %System% is a variable. The worm locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  3. Modifies the Autoexec.bat file, adding the following line to the end of the file:

    @win %System%\<random filename>

  4. Modifies %Windir%\Win.ini, adding itself to the "run" line of the [windows] section:

    run=C:\WINDOWS\SYSTEM\<random filename>

    NOTE: %Windir% is a variable. The worm locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.

  5. Modifies %Windir%\system.ini, adding itself to the "shell" line of the [boot] section:

    shell=Explorer.exe C:\WINDOWS\SYSTEM\<random filename>

  6. Sets the value:


    in the keys:
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
    • HKEY_CURRENT_USER\Software\Microsoft\WindowsNT\CurrentVersion\

  7. Sets the value:


    in the key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows Scripting Host\Settings

  8. Creates the key:


  9. Spreads through file-sharing networks by copying itself to shared directories used by the following applications:
    • AppleJuice
    • BearShare
    • eDonkey
    • ICQ
    • Filetopia
    • FileNavigator
    • Gnucleus
    • Grokster
    • iMesh
    • Kazaa
    • Morpheus
    • Shareaza
    • LimeWire
    • Soulseek

      Using the following filenames:

    • 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 (crack).exe
    • Clone CD
    • 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

  10. May also attempt to:
    • Terminate processes belonging to antivirus and firewall software.
    • Spread through IRC using "dcc send" commands.
    • Infect Microsoft Word documents and Excel spreadsheets.
    • Download malicious code from the Internet.
    • Send email to contacts in the Microsoft Outlook address book. The mail will have one of following subjects and attachments:

      • 11 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 names:
      • (Demo).pif
      • 11Fantasmas.scr
      • 11Ghosts.scr
      • Angel.scr
      • AutoAyuda.pif
      • Bardiel
      • Boletin N.205.com
      • Bulletin N.205.com
      • Carta.scr
      • Chupayruna.scr
      • CiberGirls.pif
      • Crack.bat
      • CuentasPWL.pif
      • Day.scr
      • DimensionDesubicada.scr
      • Fotos.scr
      • Help.pif
      • Image.pif
      • Letter.scr
      • MailFile.bat
      • ManualMagia.bat
      • ManualMagic.bat
      • ManualSec.pif
      • ManualSeduction.pif
      • Microsoft Bulletin 200.com
      • Nostradamus.pif
      • Pictures.scr
      • Profecia.pif
      • Realidad.bat
      • Reality.bat
      • SexSimulator.exe
      • Slayer.pif
      • TF.pif
      • TestLove.pif
      • Trivia.bat
      • TuFoto.pif
      • Visor.bat
      • YourPicture.pif
      • finder.bat
      • prophecy.pif
      • www.EnterTvRed.com
      • www.Models.com
      • www.ModelsALLg.com
      • www.XImage.com
      • www.ftpfree.com
      • www.gmol.com
      • www.rdA.com


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.


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. Update the virus definitions.
  3. Run a full system scan and delete all the files detected as W32.HLLW.Darby.
  4. Reverse the modifications made to the registry.
  5. Edit the system files.
For specific details on each of these steps, read the following instructions.

1. Disabling 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:
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. Updating 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 on U.S. business days (Monday through Friday). 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.

3. Scanning for and deleting 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.HLLW.Darby, click Delete.

4. Reversing the changes made to the registry

CAUTION: 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.

Before repairing the registry, first re-enable the registry tools.
  1. Click Start, then Run. (The Run dialog box appears.)

  2. Type:


    and click OK. (Notepad opens a text file.)

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




  4. Save the file as:


    in the root folder (usually C:\).

  5. Click Start, then Run.

  6. Type:

    regedit -s \repair.reg

    and click OK.

  7. Click Start, and then click Run.

  8. Type regedit

    Then click OK. (The Registry Editor opens.)

  9. Navigate to the key:


  10. In the right pane, delete the value:

    "MicroLoad"="%System%\<random filename>"

  11. Navigate to the key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows Scripting Host\Settings

  12. In the right pane, delete the value:


  13. Navigate to the key:


    and delete it.

  14. Exit the Registry Editor.

5. Editing the system files

If you are running Windows 95/98/Me, follow these steps:
  1. The function you perform depends on your operating system:
    • Windows 95/98: Go to step B.
    • Windows Me: If you are running Windows Me, the Windows Me file-protection process may have made a backup copy of the Win.ini file that you need to edit. If this backup copy exists, it will be in the C:\Windows\Recent folder. Symantec recommends that you delete this file before continuing with the steps in this section. To do this:
      1. Start Windows Explorer.
      2. Browse to and select the C:\Windows\Recent folder.
      3. In the right pane, select the Win.ini file and delete it. The Win.ini file will be regenerated when you save your changes to it in step F.

  2. Click Start, and then click Run.
  3. Type the following, and then click OK.

    edit c:\windows\win.ini

    (The MS-DOS Editor opens.)

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

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

    run = C:\WINDOWS\SYSTEM\<random filename>

    If this line exists, delete it.

  5. Click File, and then click Save.
  6. Click File, and then click Close.
  7. Click File, and then click Open. Enter "C:\Windows\system.ini" when prompted for a filename.
  8. In the [boot] section of the file, look for a line similar to:

    shell = Explorer.exe C:\WINDOWS\SYSTEM\<random filename>

  9. If this line exists, delete everything to the right of Explorer.exe.

    When you are done, it should look like:

    shell = Explorer.exe

  10. Click File, and then click Save
  11. Click File, and then click Close.
  12. Click File, and then click Open. Enter "\Autoexec.bat" when prompted for a filename.
  13. Scroll to the bottom of the file and delete any line similar to:

    @win C:\WINDOWS\SYSTEM\<random filename>

  14. Click File, and then click Save.
  15. Click File, and then click Exit.

Writeup By: Heather Shannon