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Discovered: August 19, 2003
Updated: February 13, 2007 12:05:20 PM
Also Known As: W32.Squirm@mm, W32/Pandem-B [Sophos]
Type: Worm
Systems Affected: Windows

W32.Pandem.B.Worm is an Internet worm that is written in C++ and is packed with PEBundle.

This worm attempts to spread using the following methods:

  • By email, it sends itself to the contacts in the Microsoft Outlook Address Book, with the following message:

    From: support@microsoft.com
    Subject: Microsoft Security Bulletin
    Unchecked Buffer in Windows Explorer Could Enable System Compromise (329390)

    Who should read this bulletin: Customers using Microsoft Windows 95,98,2K,ME,XP
    Impact of vulnerability: Run code of an attacker's choice

    Maximum Severity Rating: Critical

    Recommendation: Customers using Microsoft Windows 95,98,2K,ME,XP should apply the patch immediately.

    Attachment: patch.zip or patch_329390.exe

  • Through file-sharing applications, including KaZaA, Morpheus, eDonkey, Grokster, LimeWire, GNucleus, BearShare, Direct Connect, and ICQ: By placing itself in their default shared folders, if the programs are installed.

  • By using DCC, the worm sends in IRC.

The worm sends a notification to its author when a host is infected and listens on port 61282 for a connection.

NOTE: Virus definitions dated prior to August 21, 2003 may detect this threat as W32.Squirm@mm.

The worm may drop the following files:
  • C:\Program Files\Gnucleus\Downloads\Incoming\ICQ Hack.Exe
  • C:\Program Files\Gnucleus\Downloads\ICQ Hack.Exe
  • C:\Program Files\KMD\My Shared Folder\ICQ Hack.Exe
  • C:\Program Files\Bearshare\Shared\ICQ Hack.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\ICQ Hack.Exe
  • C:\Program Files\Kazaa\My Shared Folder\ICQ Hack.Exe
  • C:\Program Files\Morpheus\My Shared Folder\ICQ Hack.Exe
  • C:\Program Files\Edonkey2000\Incoming\ICQ Hack.Exe
  • C:\Program Files\Direct Connect\Received Files\ICQ Hack.Exe
  • C:\Program Files\Grokster\My Grokster\ICQ Hack.Exe
  • C:\Program Files\Limewire\Shared\ICQ Hack.Exe
  • C:\Program Files\Icq\Shared Files\ICQ Hack.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Connection Booster.Exe
  • C:\Program Files\Gnucleus\Downloads\Connection Booster.Exe
  • C:\Program Files\KMD\My Shared Folder\Connection Booster.Exe
  • C:\Program Files\Bearshare\Shared\Connection Booster.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Connection Booster.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Connection Booster.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Connection Booster.Exe
  • C:\Program Files\Edonkey2000\Incoming\Connection Booster.Exe
  • C:\Program Files\Direct Connect\Received Files\Connection Booster.Exe
  • C:\Program Files\Grokster\My Grokster\Connection Booster.Exe
  • C:\Program Files\Limewire\Shared\Connection Booster.Exe
  • C:\Program Files\Icq\Shared Files\Connection Booster.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Serials Collections.Exe
  • C:\Program Files\Gnucleus\Downloads\Serials Collections.Exe
  • C:\Program Files\KMD\My Shared Folder\Serials Collections.Exe
  • C:\Program Files\Bearshare\Shared\Serials Collections.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Serials Collections.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Serials Collections.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Serials Collections.Exe
  • C:\Program Files\Edonkey2000\Incoming\Serials Collections.Exe
  • C:\Program Files\Direct Connect\Received Files\Serials Collections.Exe
  • C:\Program Files\Grokster\My Grokster\Serials Collections.Exe
  • C:\Program Files\Limewire\Shared\Serials Collections.Exe
  • C:\Program Files\Icq\Shared Files\Serials Collections.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Hotmail Hack.Exe
  • C:\Program Files\Gnucleus\Downloads\Hotmail Hack.Exe
  • C:\Program Files\KMD\My Shared Folder\Hotmail Hack.Exe
  • C:\Program Files\Bearshare\Shared\Hotmail Hack.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Hotmail Hack.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Hotmail Hack.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Hotmail Hack.Exe
  • C:\Program Files\Edonkey2000\Incoming\Hotmail Hack.Exe
  • C:\Program Files\Direct Connect\Received Files\Hotmail Hack.Exe
  • C:\Program Files\Grokster\My Grokster\Hotmail Hack.Exe
  • C:\Program Files\Limewire\Shared\Hotmail Hack.Exe
  • C:\Program Files\Icq\Shared Files\Hotmail Hack.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Norton Keygen-All Vers.Exe
  • C:\Program Files\Gnucleus\Downloads\Norton Keygen-All Vers.Exe
  • C:\Program Files\KMD\My Shared Folder\Norton Keygen-All Vers.Exe
  • C:\Program Files\Bearshare\Shared\Norton Keygen-All Vers.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Norton Keygen-All Vers.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Norton Keygen-All Vers.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Norton Keygen-All Vers.Exe
  • C:\Program Files\Edonkey2000\Incoming\Norton Keygen-All Vers.Exe
  • C:\Program Files\Direct Connect\Received Files\Norton Keygen-All Vers.Exe
  • C:\Program Files\Grokster\My Grokster\Norton Keygen-All Vers.Exe
  • C:\Program Files\Limewire\Shared\Norton Keygen-All Vers.Exe
  • C:\Program Files\Icq\Shared Files\Norton Keygen-All Vers.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Hacker.Scr
  • C:\Program Files\Gnucleus\Downloads\Hacker.Scr
  • C:\Program Files\KMD\My Shared Folder\Hacker.Scr
  • C:\Program Files\Bearshare\Shared\Hacker.Scr
  • C:\Program Files\Kazaa Lite\My Shared Folder\Hacker.Scr
  • C:\Program Files\Kazaa\My Shared Folder\Hacker.Scr
  • C:\Program Files\Morpheus\My Shared Folder\Hacker.Scr
  • C:\Program Files\Edonkey2000\Incoming\Hacker.Scr
  • C:\Program Files\Direct Connect\Received Files\Hacker.Scr
  • C:\Program Files\Grokster\My Grokster\Hacker.Scr
  • C:\Program Files\Limewire\Shared\Hacker.Scr
  • C:\Program Files\Icq\Shared Files\Hacker.Scr
  • C:\Program Files\Gnucleus\Downloads\Incoming\Credit Card.Exe
  • C:\Program Files\Gnucleus\Downloads\Credit Card.Exe
  • C:\Program Files\KMD\My Shared Folder\Credit Card.Exe
  • C:\Program Files\Bearshare\Shared\Credit Card.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Credit Card.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Credit Card.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Credit Card.Exe
  • C:\Program Files\Edonkey2000\Incoming\Credit Card.Exe
  • C:\Program Files\Direct Connect\Received Files\Credit Card.Exe
  • C:\Program Files\Grokster\My Grokster\Credit Card.Exe
  • C:\Program Files\Limewire\Shared\Credit Card.Exe
  • C:\Program Files\Icq\Shared Files\Credit Card.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Cracks Collections.Exe
  • C:\Program Files\Edonkey2000\Incoming\Cracks Collections.Exe
  • C:\Program Files\Direct Connect\Received Files\Cracks Collections.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Cracks Collections.Exe
  • C:\Program Files\Gnucleus\Downloads\Cracks Collections.Exe
  • C:\Program Files\KMD\My Shared Folder\Cracks Collections.Exe
  • C:\Program Files\Bearshare\Shared\Cracks Collections.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Cracks Collections.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Cracks Collections.Exe
  • C:\Program Files\Grokster\My Grokster\Cracks Collections.Exe
  • C:\Program Files\Limewire\Shared\Cracks Collections.Exe
  • C:\Program Files\Icq\Shared Files\Cracks Collecions.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Simpsons.Exe
  • C:\Program Files\Gnucleus\Downloads\Simpsons.Exe
  • C:\Program Files\KMD\My Shared Folder\Simpsons.Exe
  • C:\Program Files\Bearshare\Shared\Simpsons.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Simpsons.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Simpsons.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Simpsons.Exe
  • C:\Program Files\Edonkey2000\Incoming\Simpsons.Exe
  • C:\Program Files\Direct Connect\Received Files\Simpsons.Exe
  • C:\Program Files\Grokster\My Grokster\Simpsons.Exe
  • C:\Program Files\Limewire\Shared\Simpsons.Exe
  • C:\Program Files\Icq\Shared Files\Simpsons.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\XXX Virtual Sex.Scr
  • C:\Program Files\Gnucleus\Downloads\XXX Virtual Sex.Scr
  • C:\Program Files\KMD\My Shared Folder\XXX Virtual Sex.Scr
  • C:\Program Files\Bearshare\Shared\XXX Virtual Sex.Scr
  • C:\Program Files\Kazaa Lite\My Shared Folder\XXX Virtual Sex.Scr
  • C:\Program Files\Kazaa\My Shared Folder\XXX Virtual Sex.Scr
  • C:\Program Files\Morpheus\My Shared Folder\XXX Virtual Sex.Scr
  • C:\Program Files\Edonkey2000\Incoming\XXX Virtual Sex.Scr
  • C:\Program Files\Direct Connect\Received Files\XXX Virtual Sex.Scr
  • C:\Program Files\Grokster\My Grokster\XXX Virtual Sex.Scr
  • C:\Program Files\Limewire\Shared\XXX Virtual Sex.Scr
  • C:\Program Files\Icq\Shared Files\XXX Virtual Sex.Scr
  • C:\Program Files\Gnucleus\Downloads\Incoming\Cracker Game.Exe
  • C:\Program Files\Gnucleus\Downloads\Cracker Game.Exe
  • C:\Program Files\KMD\My Shared Folder\Cracker Game.Exe
  • C:\Program Files\Bearshare\Shared\Cracker Game.Exe
  • C:\Program Files\Kazaa Lite\My Shared Folder\Cracker Game.Exe
  • C:\Program Files\Kazaa\My Shared Folder\Cracker Game.Exe
  • C:\Program Files\Morpheus\My Shared Folder\Cracker Game.Exe
  • C:\Program Files\Edonkey2000\Incoming\Cracker Game.Exe
  • C:\Program Files\Direct Connect\Received Files\Cracker Game.Exe
  • C:\Program Files\Grokster\My Grokster\Cracker Game.Exe
  • C:\Program Files\Limewire\Shared\Cracker Game.Exe
  • C:\Program Files\Icq\Shared Files\Cracker Game.Exe
  • C:\Program Files\Gnucleus\Downloads\Incoming\Matrix Reloaded.Scr
  • C:\Program Files\Gnucleus\Downloads\Matrix Reloaded.Scr
  • C:\Program Files\KMD\My Shared Folder\Matrix Reloaded.Scr
  • C:\Program Files\Bearshare\Shared\Matrix Reloaded.Scr
  • C:\Program Files\Kazaa Lite\My Shared Folder\Matrix Reloaded.Scr
  • C:\Program Files\Kazaa\My Shared Folder\Matrix Reloaded.Scr
  • C:\Program Files\Morpheus\My Shared Folder\Matrix Reloaded.Scr
  • C:\Program Files\Edonkey2000\Incoming\Matrix Reloaded.Scr
  • C:\Program Files\Direct Connect\Received Files\Matrix Reloaded.Scr
  • C:\Program Files\Grokster\My Grokster\Matrix Reloaded.Scr
  • C:\Program Files\Limewire\Shared\Matrix Reloaded.Scr
  • C:\Program Files\Icq\Shared Files\Matrix Reloaded.Scr

Antivirus Protection Dates

  • Initial Rapid Release version August 20, 2003
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version August 20, 2003
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date August 20, 2003

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

Writeup By: John Canavan

Discovered: August 19, 2003
Updated: February 13, 2007 12:05:20 PM
Also Known As: W32.Squirm@mm, W32/Pandem-B [Sophos]
Type: Worm
Systems Affected: Windows

When W32.Pandem.B.Worm is executed, it performs the following actions:

  1. Drops the file, %Windir%\Zlib.dll, which is a legitimate compression utility.

    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.

  2. Starts listening on port 61282 for a connection from the worm's author.

  3. Displays the following dialog box:

  4. When you click OK, the worm adds the value:

    "CPU Manager" = "%Windir%\cpumgr.exe"

    to the registry key:


    and the value:


    to the key:


  5. Drops the files:
    • %Windir%\Cpumgr.dll: An encoded copy of the worm.
    • %Windir%\Cpumgr.exe: The worm's executable.
    • %Windir%\Pdmn.smt: A file containing information about the local computer.
    • %Windir%\Photo.zip: A zip file containing a copy of the worm.

  6. Displays the following dialog box:

  7. When you click OK, the worm remains memory-resident, and after a period of time, it drops files to the default shared folders of some popular file-sharing program. For a complete list of the paths and filenames, see the "Additional Information" section.

  8. Attempts to contact www.google.com to check for Internet connectivity.

  9. If this check succeeds, the worm attempts to mail itself with the message:

    From: support@microsoft.com
    Subject: Microsoft Security Bulletin
    Unchecked Buffer in Windows Explorer Could Enable System Compromise (329390)

    Who should read this bulletin: Customers using Microsoft Windows 95,98,2K,ME,XP
    Impact of vulnerability: Run code of an attacker's choice

    Maximum Severity Rating: Critical

    Recommendation: Customers using Microsoft Windows 95,98,2K,ME,XP should apply the patch immediately.
    Attachment: patch.zip or patch_329390.exe

  10. Attempts to notify the author with an email containing the following message:

    Subject: Yet another infected machine!
    Body: W32/Pandemonium
    I'm here to serve you!


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: John Canavan

Discovered: August 19, 2003
Updated: February 13, 2007 12:05:20 PM
Also Known As: W32.Squirm@mm, W32/Pandem-B [Sophos]
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. Update the virus definitions.
  3. Run a full system scan and delete all the files detected as W32.Pandem.B.Worm.
  4. Delete the value that was added to the registry.
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.Pandem.B.Worm, click Delete.

4. 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:


  4. In the right pane, delete the value:


  5. Exit the Registry Editor.

Writeup By: John Canavan