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Discovered: July 30, 2003
Updated: February 13, 2007 12:04:33 PM
Type: Worm

W32.HLLW.Shower.J is a worm that spreads through file-sharing networks, such as KaZaA and Morpheus.

Several variants have been found. All the variants are written in the Microsoft Visual Basic programming language. Some variants are compressed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version July 31, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version July 31, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date August 06, 2003

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

Writeup By: Tony Lee

Discovered: July 30, 2003
Updated: February 13, 2007 12:04:33 PM
Type: Worm

When W32.HLLW.Shower.J runs, it does the following:

  1. Displays a fake message:

    "Run-time error '424'; Object required."

    The message box is titled "VB6 P2P Worm."

  2. Copies itself as C:\%Windir%\Sysmon32.exe.

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

  3. Copies itself into one or more of the following folders:
    • %ProgramFilesDir%\Kazaa Lite\My Shared Folder
    • %ProgramFilesDir%\Kazaa\My Shared Folder
    • %ProgramFilesDir%\Kmd\My Shared Folder
    • %ProgramFilesDir%\Grokster\My Grokster
    • %ProgramFilesDir%\BearShare\Shared
    • %ProgramFilesDir%\Morpheus\My Shared Folder
    • %ProgramFilesDir%\LimeWire\Shared
    • %ProgramFilesDir%\Winmx\Shared
    • C:\My Shared Folder

      NOTE: %ProgramFilesDir% is a variable. By default, this is C:\Program Files on windows systems.

  4. The dropped file uses various names, including one or more of the following:
    • HotMail Hack.exe
    • AIM & AOL Password Hacker.exe
    • Mircosoft CD Key Generator.exe
    • Sex Simulator.exe
    • Half Life AIM Bot Hack.exe
    • Advanced Password Recovery Hacker.exe
    • AIM Hacker.exe
    • Blo0d 's AIM Toolz.exe
    • ICQ Hack.exe
    • Spy Toolz.exe
    • Hack Any Computer.exe
    • Website Hacker.exe
    • IP Nuker.exe
    • Windows Hacker.exe
    • Windows CD KeyGen.exe
    • Warcraft III CD Key Hack.exe
    • Swift 3D.v3.Keygen.exe
    • Sony PlayStation Hack Boot Disk (No MOD Chip Needed) A+++!.exe
    • PS and PS2 Emulators.exe
    • Password Decoder.exe
    • Diablo II - Maphack v5.6.exe
    • Teen Screen Saver.exe
    • Halflife & CounterStrike Hack Pack.exe
    • CyberPass Keygen for Adult Sites.exe
    • Neverwinter Nights CD Keygn (working).exe
    • Cd Keys for all games.exe
    • Adobe Photoshop 7.0 serial key.exe
    • l33t's Half Life CD Kie Gen.exe
    • Super Sex Games.exe
    • The Sex Files.exe
    • Adult Tetris.exe
    • Interactive Sex Game. Funny XXX.exe
    • Make-a-Britney.exe
    • Pong.exe
    • Turbo Pong.exe
    • Diablo 2 (full).exe
    • CD KEY HACKER.exe
    • Monitor.exe
    • System Monitor.exe
    • Cool Page 2.7 Web Page Design.exe

  5. Sets the aforementioned folder(s) as the default shared folder(s) for its corresponding file-sharing program. Other file-sharing program users can download files from these folders.
    NOTE: For the worm to spread, KaZaA or Morpheus software must be installed on the computer.


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: Tony Lee

Discovered: July 30, 2003
Updated: February 13, 2007 12:04:33 PM
Type: Worm

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. Do one of the following:
    • Windows 95/98/Me: Restart the computer in Safe mode.
    • Windows NT/2000/XP: End the Trojan process.
  4. Run a full system scan and delete all the files detected as W32.HLLW.Shower.J.
For 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. 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 W32.HLLW.Shower.J.
    6. If you find the file, click it, and then click End Process.
    7. Exit the Task Manager.
4. Scanning for and deleting the infected files

Writeup By: Tony Lee