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Discovered: May 03, 2005
Updated: February 13, 2007 12:38:27 PM
Also Known As: Win32.Kebede.C [Computer Assoc, Email-Worm.Win32.Kebede.{b, c} [Kaspersky Lab], W32/Generic.e [McAfee], W32/Kedebe-C [Sophos], WORM_KEDEBE.{B, C} [Trend Micro]
Type: Worm
Systems Affected: Windows

W32.Kedebe.B@mm is a mass-mailing worm that ends processes and prevents access to some Web sites, some of which are security related.

Removing entries from the Hosts file
If this threat has modified the Windows Hosts file, there are two ways to remove these entries:

  • Install and run the current version of LiveUpdate. This will remove only the entries that refer to Symantec domains.
  • Manually edit the Hosts file and remove all the entries that the threat added.

To run the current version of LiveUpdate
  1. Click download LiveUpdate.

    If you are not reading this Web page on the computer that is getting the error notice, the address for downloading the file is:


    If necessary, you can type this address into the address bar of the problem computer. Changes to the Hosts file will not stop you from getting to this site.

  2. Save the file to the Windows desktop.
  3. Double-click the lusetup.exe icon on the desktop to install LiveUpdate.
  4. Run LiveUpdate.
  5. Did you see the message "LU1860: LiveUpdate has detected a potential security compromise on your computer"?
    • If you did, let LiveUpdate "Remove these entries from the hosts files" (Recommended).
      This should allow LiveUpdate to run.
    • If you did not, that was not the cause of the problem. Return to the Removal section.

To manually edit the Hosts file and remove all the entries that the worm added

Note: The location of the Hosts file may vary and some computers may not have this file. For example, if the file exists in Windows 98, it will usually be in C:\Windows; and it is located in the C:\WINNT\system32\drivers\etc folder in Windows 2000. There may also be multiple copies of this file in different locations.

Follow the instructions for your operating system:
  • Windows 95/98/Me/NT/2000
    1. Click Start, point to Find or Search, and then click Files or Folders.
    2. Make sure that "Look in" is set to (C:) and that "Include subfolders" is checked.
    3. In the "Named" or "Search for..." box, type:


    4. Click Find Now or Search Now.
    5. For each Hosts file that you find, right-click the file, and then click Open With.
    6. Deselect the "Always use this program to open this program" check box.
    7. Scroll through the list of programs and double-click Notepad.
    8. When the file opens, delete all the entries in Step 10 of the Technical Details section.
    9. Close Notepad and save your changes when prompted.

  • Windows XP
    1. Click Start > Search.
    2. Click All files and folders.
    3. In the "All or part of the file name" box, type:


    4. Verify that "Look in" is set to "Local Hard Drives" or to (C:).
    5. Click More advanced options.
    6. Check Search system folders.
    7. Check Search subfolders.
    8. Click Search.
    9. Click Find Now or Search Now.
    10. For each Hosts file that you find, right-click the file, and then click Open With.
    11. Deselect the Always use this program to open this program check box.
    12. Scroll through the list of programs and double-click Notepad.
    13. When the file opens, delete all the entries in Step 10 of the Technical Details section.
    14. Close Notepad and save your changes when prompted.

Antivirus Protection Dates

  • Initial Rapid Release version May 03, 2005
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version May 03, 2005
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date May 04, 2005

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

Writeup By: Rodney Andres

Discovered: May 03, 2005
Updated: February 13, 2007 12:38:27 PM
Also Known As: Win32.Kebede.C [Computer Assoc, Email-Worm.Win32.Kebede.{b, c} [Kaspersky Lab], W32/Generic.e [McAfee], W32/Kedebe-C [Sophos], WORM_KEDEBE.{B, C} [Trend Micro]
Type: Worm
Systems Affected: Windows

When W32.Kedebe.B@mm is executed, it performs the following actions:

  1. Creates any of the following files:

    • %System%\winssc32.exe
    • %System%\mscppmgr.exe
    • %System%\kerne132.exe
    • %System%\NAVMON.EXE
    • %System%\drwmgr32.exe
    • %System%\DLLH0ST.EXE
    • %System%\gcasctrl.exe
    • %System%\msscan.exe
    • %System%\cuApp.exe
    • %System%\LSSAS.EXE
    • %System%\AVmon.exe
    • %System%\SERVlCES.EXE
    • %System%\gcasSav32.exe
    • %System%\LUC0MS~1.EXE
    • %System%\zlbclient.exe
    • %System%\mantispam.exe
    • %System%\NETM0N.EXE
    • %System%\srvchost.exe
    • %System%\USRMGRINIT.JFX

      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).

  2. Drops the following harmless text file:


  3. Copies itself to all folders containing the string "shar" or "users". It copies itself using the following filenames:

    • Admin Password Cracker.exe
    • DVD ripper keygen.exe
    • Messenger 7.0 Installer.exe
    • Microsoft AntiSpyware Patch.com
    • Mydoom removal tool.exe
    • Naked teen-Actions.com
    • Norton Personal Firewall 2005 Patch.exe
    • Spyware remover.exe
    • Win Server 2003 Remote Exploit.cmd
    • ZoneAlarm Security Suite 2005 Crack.com

  4. Adds the value:

    "Windows [worm file name without extension] Monitor" = "[path to original file]"

    to the registry subkey:


    so that the worm runs every time Windows starts.

  5. Adds the value:

    "Run" = "[path to original file]"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

    so that the worm runs every time Windows starts.

  6. Gathers email addresses from files with the following extensions on the compromised computer:

    • .abc
    • .asp
    • .dhtm
    • .doc
    • .eml
    • .htm
    • .html
    • .php
    • .rtf
    • .txt
    • .vcf
    • .wab
    • .xhtm

      The worm avoids sending email to addresses containing the following strings:

    • sophos
    • @microsoft
    • @google
    • .org
    • @syman
    • norton
    • example
    • rating
    • .gov
    • submit
    • kasper
    • abuse
    • 1domain
    • gmail
    • spam
    • @mm
    • virus
    • winzip
    • msdn
    • winrar
    • zone
    • privacy
    • contact
    • upport
    • your
    • master@
    • you@
    • mozilla
    • linux
    • detection
    • icrosoft
    • mcafee
    • @www
    • comment
    • anyone
    • anywhere
    • somebody
    • someone
    • subscribe
    • free-av
    • password
    • report
    • name@
    • admin
    • spybot
    • nobody
    • help

      The worm also generates email addresses using the following strings:

    • daniel_kuul
    • helen
    • helen_2002
    • helina_sexy
    • joe_soul
    • michael
    • samuel_99
    • aol.com
    • fastmail.fm
    • gmail.com
    • hotmail.com
    • mail.com
    • msn.com
    • myway.com
    • Postmaster
    • Webmaster
    • yahoo.co.uk
    • yahoo.com

  7. Spreads by sending a copy of itself to the email addresses gathered. The email has the following characteristics:

    One of the following:

    • Invalid MIME version indiacted.
    • Failure delivery
    • Mail Delivery Subsystem
    • Symantec Security Response. Urgent!
    • Mail server changing information

      Message Body:
      One of the following:

    • Invalid MIME version indicated. Original message has been sent as Base64 encoded attachment
    • Unable to deliver e-mail to the following user:
      Reason: mail server rejected your e-mail due to unknown font type you used.(SMTP-ERROR: 453)
      This is common to happen on some mail servers with no decoder currently installed. We recommend you to correct the errors indicated in the attachment and send again. If this problem continues to happen, you can use our special-font to PDF convertor from the Web site .
      Virtually yours
      technical support team.
    • Dear customer,
      We have been working hard to prevent you from computer Viruses, Trojan horses and Internet Worms.
      But we have found a new and different computer Virus spreading through the Internet-which cannot
      be detected by any AnitVirus softwares other than Norton
      This Worm has been on the Internet since last month. Considering this, Symantec Security Response has prepared
      'Patch' that works for all AntiVirus softwares including, Sophos and McAfee
      Symantec strongely recommend you to download and install this patch.
      But if your computer is already infected then this patch will not work. Furthermore, the new variant is hard to be removed after being infected. Do not wait untill your computer gets infected.
      NOTE: This is a freeware. You can share it with any of your relatives, provided you keep the copy right notice "AS IS".
      Symantec Security Response Team. All Rights Reserved.
    • Dear user,
      This is to inform you that we are planning to clean the mail server
      for Viruses. During this time the server may be down. So we have created a temporary mail account for you on a temporary server. In this case, your current ID,
      will be used but you'll need to log on to another server. How to perform this operation, the temporary mail server address and your temporary mail ID is in the attached file.
      Follow the clearly organised steps in the attachment to log on to our temporary mail server. Be careful! This server is going to be closed in about three days, as you might not be able to log on until we upgrade the server.
      If you encounter any problem during the process, please contact:
      Sorry for the inconveniences you encountered.

      The attachment file name may contain one of the following strings:

    • Base64_Encoded_Message
    • Error
    • Patch
    • Temporary_Account_Info

  8. Opens a back door on a random TCP port and waits for commands from a remote attacker to perform the following actions:

    • Log keystrokes
    • Modify the mouse settings
    • Disable the clipboard
    • Block user input

  9. Lowers security settings by attempting to end the following processes, some of which may be security-related:

    • ASFAgent.exe
    • avserve2.exe
    • DAP.EXE
    • ESCANH95.EXE
    • gcasDtServ.exe
    • gcasServ.exe
    • gcasServAlert.exe
    • GIANTAntiSpywareMain.exe
    • GIANTAntiSpywareUpdater.exe
    • isafe.exe
    • LLSSev.exe
    • LUCOMS~1.EXE
    • LXER32.VAV
    • mantispm.exe
    • MSSMMC32.EXE
    • OPScan.exe
    • PENIS32.EXE
    • Rtvscan.exe
    • SNDSrvc.exe
    • SPBBCSvc.exe
    • vsmon.exe
    • lclient.exe
    • ZONALM2601.EXE

  10. Modifies the Hosts file to block access to the following Web sites:


  11. Creates the following mutexes so that only one instance of the threat runs on the compromised computer and to prevent other known threats from running:

    • hmm, Mydoom<=>DEAD! Kebede Comin' up in C/C++!!
    • qwedefacedRDE
    • --->>>>ZxPqqi<<<<';;;
    • ;;C__ISSSGVA
    • --->M|g'u x t|q|q|p g|j|m|l|t g|q
    • h|q|m|l g|j|v
    • *|*|*|*|* u|q|k|m|v|g|f!<---
    • -qQ]aA|-U-c-f-L-v-g-|Aa[Qq-_
    • MuXxXxTENYKSDesignedAsTheFollowerOfSkynet-D
    • [SkyNet.cz]SystemsMutex
    • AdmSkynetJklS003
    • ____--->>>>S<<<<--_____
    • UrvzUmdkUigaU0
    • NTShell Taskman Startup Mutex
    • 'D'r'o'p'p'e'd'S'k'y'N'e't'
    • 43jfds93872
    • J-V-N-N-Z-Q-G
    • SkynetSasserVersionWithPingFast
    • _-oOaxX|-+S+-+k+-+y+-+N+-+e+-+t+-|XxKOo-_
    • WWWdefacedWWW
    • ion
    • LK[SkyNet.cz]SystemsMutex
    • SkyNet-Sasser
    • NetDy_Mutex_Psycho
    • 89845848594808308439858307378280987074387498739847
    • AdmMoodownJKIS003
    • SkYnEt_AVP
    • _-oO]xX|-S-k-y-N-e-t-|Xx[Oo-_
    • ~~~Bloodred~~~owns~~~you~~~xoxo~~~2004
    • Protect_USUkUyUnUeUtU_Mutex
    • DrDetroit[Bloodred.B]
    • MI[SkyNet.cz]SystemsMutex
    • and bla bla bla...[Kebede.C]

  12. May attempt to delete the following files and folders:

    • %ProgramFiles%\Microsoft AntiSpyware\GIANTAntiSpywareMain.exe
    • %ProgramFiles%\Microsoft AntiSpyware\GIANTAntiSpywareUpdater.exe
    • %ProgramFiles%\Norton AntiVirus\OPSCAN.EXE
    • %ProgramFiles%\Zone Labs\ZoneAlarm\MailFrontierZone Labs\ZoneAlarm\MailFrontier\mantispm.exe
    • %Windir%\srchasst\mui\0409\baloon.xsl
    • %Windir%\srchasst\mui\0409\bar.xsl
    • %Windir%\srchasst\mui\0409\lcladvdf.xml

    • %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).

  13. Modifies the values:

    "RegisteredOrganization" = "The Kebede Team 2005"
    "RegisteredOwner" = "BiniDogg"

    in one of the following the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion

    which changes the compromised computer's registration information.

  14. Displays the following message:

    Title: Windows
    Windows could not locate the required DLL: wrong platform selected.


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: Rodney Andres

Discovered: May 03, 2005
Updated: February 13, 2007 12:38:27 PM
Also Known As: Win32.Kebede.C [Computer Assoc, Email-Worm.Win32.Kebede.{b, c} [Kaspersky Lab], W32/Generic.e [McAfee], W32/Kedebe-C [Sophos], WORM_KEDEBE.{B, C} [Trend Micro]
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.Kedebe.B@mm.
  4. Delete any values added to the registry.
For specific 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:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable 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 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 document: 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 document: Virus Definitions (Intelligent Updater).

    The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.

    Note: If you see an error, such as LU1418, when you try to run LiveUpdate and you cannot get the Web site hosting the Intelligent Updater, it is likely that the worm has modified the Hosts file. You can either download and install LiveUpdate 2.5, which can remove Symantec entries from that file, or you can edit it yourself. See the instructions for both in the "Additional Information" section below.

3. 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.Kedebe.B@mm, click Delete.

    If your Symantec antivirus product reports that it cannot delete an infected file, Windows may be using the file. To fix this, run the scan in Safe mode. For instructions, read the document: How to start the computer in Safe Mode. Once you have restarted in Safe mode, run the scan again.

    After the files are deleted, restart the computer in Normal mode and proceed with section 4.

    Warning messages may be displayed when the computer is restarted, as the threat has not been fully removed at this point. Please ignore these messages and just click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

    Title: [File path]
    Message body: Windows cannot find [file name]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

4. To delete the value from 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 subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.
  1. Click Start > Run.
  2. Type regedit
  3. Click OK.

  4. Navigate to the subkey:


  5. In the right pane, delete the value:

    "Windows [worm file name without extension] Monitor" = "[path to original file]"

  6. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows

  7. In the right pane, delete the value:

    "Run" = "[path to original file]"

  8. Exit the Registry Editor.

Writeup By: Rodney Andres