W32.HLLW.Sucon.B@mm

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Discovered: August 06, 2003
Updated: February 13, 2007 12:04:45 PM
Type: Worm
Systems Affected: Windows


W32.HLLW.Sucon.B@mm is a mass-mailing worm that attempts sends itself to all the contacts in the Microsoft Outlook Address Book. The worm also attempts to delete antivirus and firewall software and system files.

The file name of the attachment is Suconelo.exe.

Antivirus Protection Dates

  • Initial Rapid Release version August 07, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version August 07, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date August 13, 2003

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

Writeup By: Yana Liu

Discovered: August 06, 2003
Updated: February 13, 2007 12:04:45 PM
Type: Worm
Systems Affected: Windows


When W32.HLLW.Sucon.B@mm is executed, it does the following:

  1. Copies itself as:
    • %System%\Suconelo*.exe
    • C:\Recycled\Suconelo.exe

      NOTE: %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).

  2. Adds a value:

    "Windows" = "C:\recycled\Suconelo.exe"

    to the registry key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

    so that the worm runs when you restart Windows.

  3. Creates the subkey "Suconelo" and adds the following values:

    "mailed" = "1"
    "windeleted" = "1"
    "infected" = "1"
    "named" = "1"

    under the registry key:

    HKEY_LOCAL_MACHINE\Software

  4. Creates a subfolder, %System%\suconelo, and creates a text file, Consuelo.txt, in this folder.
    This file contains the following text:

    Consuelo I just wanna that you know the truth
    I just... just... love you.
    It's all that i can say...
    Bye baby, Consuelo don't forget it... I love you...

    NOTE: This text file is not viral by itself. Therefore, Symantec antivirus products do not detect this file. You should delete it manually if you are infected with this worm.

  5. Creates the following files:

    %Windir%\Msconfig.exe.vbs
    %Windir%\Sysedit.exe.vbs

    NOTES:
    • These Visual Basic script files are not viral by themselves. Therefore, Symantec antivirus products do not detect them. Manually delete them if this worm has infected your system.
    • %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.

  6. Renames %Windir%\cmd.exe to \%Windir%cmd.exe.vbs (for example, Windowscmd.exe.vbs).

  7. Deletes the following files from the %Windir% folder, if they exist:
    • Regedit.exe
    • Regedt32.exe
    • Msconfig.exe
    • Sysedit.exe

  8. Attempts to deletes all files in the following folders:
    • C:\Toolkitt\FindVirus
    • %ProgramFiles%\AVPersonal
    • %ProgramFiles%\AntiViral Toolkit Pro
    • %ProgramFiles%\Norton AntiVirus
    • %ProgramFiles%\Panda Software\Panda Antivirus Titanium
    • %ProgramFiles%\Panda Software\Panda Antivirus 6.0
    • %ProgramFiles%\Trend Micro\PC-cillin 2002
    • %ProgramFiles%\Trend PC-cillin 98
    • %ProgramFiles%\Trend Micro\PC-cillin 2000
    • %ProgramFiles%\Perav
    • %ProgramFiles%\McAfee\VirusScan
    • %ProgramFiles%\McAfee\McAfee VirusScan
    • %ProgramFiles%\McAfee VirusScan Professional Edition 7.0
    • %ProgramFiles%\AnalogX\Script Defender
    • %ProgramFiles%\Command Software\F-PROT95
    • %ProgramFiles%\F-Secure\Anti-Virus
    • %ProgramFiles%\Zone Labs\ZoneAlarm
    • %ProgramFiles%\ESET\NOD32

      NOTE: %ProgramFiles% is a variable that refers to the path to the program files folder. By default, this is C:\Program Files.

  9. May display the messages with the following characteristics:
    • Title: Suconelo
      Text: Hi, You're f**ked by Nincubus/ViriiZone!!!
      Don't be fooled or f**ked, be care!!!
    • Title: Watta bad luck!!!
      Text: I've erased windows Regedit or windows Regedt32. :(
    • Title: Your computer is gone
      Text: Now you've lost your machine :(
    • Title: Suconelo
      Text: be care with the thing they send you in a strange mail!!!

  10. Uses Microsoft Outlook to send itself to all the contacts in the Microsoft Outlook Address Book. The attachment filename is Suconelo.exe.
    The email has different subject lines and message bodies, such as:
    • Subject: Consuelo Pics
      Message: Check this consuelo pics, only for you, see the attachment
    • Subject: Virus Alert!!
      Message: New Virus Alert!!! Be Care With VBS/DeathLetter, in the atachment i send you an antivirus, by accepting, you'll be protected :)
    • Subject: Norton New Patches
      Message: Open this New patches of Norton for Windows 9x/Me/2000/NT/XP be care with VBS/DeathLetter, this is an ilegal patch, but don't worry. We distributed this with Symantec permission, so don't worry ;)
    • Subject: McAfee VirusScan Patches
      Message: Open this New patches of McAfee for Windows 9x/Me/2000/NT/XP be care with VBS/DeathLetter, this is an ilegal patch, but don't worry. We distributed this with McAfee permission, so don't worry ;)
    • Subject: Kaspersky AVP Patches
      Message: Open this New patches of Kaspersky AVP for Windows 9x/Me/2000/NT/XP be care with VBS/DeathLetter, this is an ilegal patch, but don't worry. We distributed this with kaspersky permission, so don't worry ;)
    • Subject: Hacking hotmail
      Message: Hey!!! There are new hacking tutorials by hacking hotmail :D Have fun!
    • Subject: Hackers Tutorials
      Message: Hi, this is a file that you can access to another machine without his or her permission. Have Fun!!!
    • Subject: Hackear hotmail
      Message: Que onda... te env? estos tutoriales para que aprendas a hackear a los que te caen mal y est? en hotmail. Diviertete!!!
    • Subject: Parches para Norton 2003
      Message: Hola!!!, por ah?dicen que hay alertas para el virus DeathLetter, as?que ejecuta estos parches para que no seas infectado :)
    • Subject: Parches para McAfee VirusScan 2003
      Message: Hola!!!, por ah?dicen que hay alertas para el virus DeathLetter, as?que ejecuta estos parches para que no seas infectado :)
    • Subject: Parches para kaspersky AVP
      Message: Hola!!!, por ah?dicen que hay alertas para el virus DeathLetter, as?que ejecuta estos parches para que no seas infectado :)
    • Subject: Fotos de Consuelo
      Message: ve las fotos de Consuelo, son solo para t?!! ;)
    • Subject: Alertas de virus!!
      Message: Hola, te env? la lista de los nuevos virus, espero que no seas afectado!!! van adjuntos los mensajes de los virus y los nombres de archivos...
    • Subject: Hacker Tutorials
      Message: Hi, I sent you Hacker tutorials by hacking the bad person who causes bad to you...
    • Subject: Fwd: Horoscopo
      Message: The horoscopo Test is in this file, have Fun!
    • Subject: Fwd: Love Test
      Message: Love test is in this file, Have Fun!
    • Subject: Re: The File Please
      Message: This is the file you ask for...
    • Subject: Re: El archivo...
      Message: Aqu?est?el archivo por el que pregunaste ;-)
    • Subject: Safety
      Message: Safety for your PC, now, then can enter to our machines just by clicking in Haktek and putting our IP, so, i sent you a Firewall 'cause I wanna Protect you!


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: Yana Liu

Discovered: August 06, 2003
Updated: February 13, 2007 12:04:45 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. Disable System Restore (Windows Me/XP).
  2. Restart in Safe mode or end the Trojan process.
  3. Delete the value that was added to the registry.
  4. Re-install Norton AntiVirus if the worm deleted the Norton AntiVirus files, if necessary.
  5. Update the virus definitions.
  6. Run a full system scan and delete all the files detected as W32.HLLW.Sucon.B@mm.
  7. Restore the system files, if necessary.
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. Restarting the computer in Safe mode or ending the Trojan process
    Windows 95/98/Me
    Restart the computer in Safe mode. All the Windows 32-bit operating systems, except for Windows NT, can be restarted in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."

    Windows NT/2000/XP
    To end the Trojan process:
    1. Press Ctrl+Alt+Delete once.
    2. Click Task Manager.
    3. Click the Processes tab.
    4. Double-click the Image Name column header to alphabetically sort the processes.
    5. Scroll through the list and look for Suconelo.exe.
    6. If you find the file, click it, and then click End Process.
    7. Exit the Task Manager.

3. Deleting the value from 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.
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "Windows" = "C:\recycled\Suconelo.exe"

  5. Navigate to the key and delete:

    HKEY_LOCAL_MACHINE\SOFTWARE\Suconelo

  6. Exit the Registry Editor.

  7. Restart the computer in Normal mode.

4. Re-installing Norton AntiVirus if the worm deleted the Norton AntiVirus files, if necessary
If you have Norton AntiVirus installed and you believe that the worm removed certain files, re-install Norton AntiVirus.
  1. Uninstall Norton AntiVirus or Norton AntiVirus Pro by following the instructions in the document that applies to your version of Norton AntiVirus:
  2. Follow the steps in the document, "How to uninstall Norton AntiVirus using the Rnav.exe removal utility," to remove Norton AntiVirus 2003. Run the Rnav2003.exe removal utility again and choose the previous version of Norton AntiVirus that you installed. (For example, if you had Norton AntiVirus 2001, then choose Norton AntiVirus 2001 when prompted while running the removal utility.) Repeat this process for all the previously installed versions of Norton AntiVirus.

  3. Restart the computer.

5. 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.

6. 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.Sucon.B@mm, click Delete.


7. Restoring the following files, if necessary
If the worm deleted the following files, you will need to restore them:
    • Regedit.exe
    • Regedt32.exe
    • Msconfig.exe
    • Sysedit.exe
    • Cmd.exe

The following documents provide general instructions on extracting files. This information is provided for your convenience. The exact steps may vary slightly depending on the configuration of your operation system, the location of the files, and so on. For additional information, read the Help files, contact Microsoft, or refer to the following Windows documentation:

Writeup By: Yana Liu