W32.Beaker.A@mm

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Discovered: December 22, 2004
Updated: February 13, 2007 12:26:12 PM
Also Known As: Email-Worm.Breacuk.a [Kaspersk, W32/Breacuk.a@MM [McAfee], W32/Beaker-A [Sophos], WORM_BEAKER.A [Trend Micro]
Type: Worm
Systems Affected: Windows


W32.Beaker.A@mm is a mass-mailing worm that sends a copy of itself by email and overwrites files on infected computers.

Antivirus Protection Dates

  • Initial Rapid Release version December 22, 2004
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version December 22, 2004
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date December 22, 2004

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

Writeup By: Fergal Ladley

Discovered: December 22, 2004
Updated: February 13, 2007 12:26:12 PM
Also Known As: Email-Worm.Breacuk.a [Kaspersk, W32/Breacuk.a@MM [McAfee], W32/Beaker-A [Sophos], WORM_BEAKER.A [Trend Micro]
Type: Worm
Systems Affected: Windows


When W32.Beaker.A@mm runs, it does the following:

  1. Copies itself as the following:

    %Windir%\Temp\[5 random lower-case characters].exe
    %Windir%\System\[5 random lower-case characters].exe
    %System%\[5 random lower-case characters].exe
    %Windir%\Fonts\[5 random lower-case characters].exe

    Notes:
    • %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).
    • %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).

  2. Adds the values:

    "[5 random lower-case characters]" = "%Windir%\System\[5 random lower-case characters].exe"
    "[5 random lower-case characters]" = "%Windir%\system32\[5 random lower-case characters].exe"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the worm runs every time Windows starts.

  3. Adds the values:

    "[5 random lower-case characters]" = "%Windir%\Temp\[5 random lower-case characters].exe"
    "[5 random lower-case characters]" = "%Windir%\Fonts\[5 random lower-case characters].exe"

    to the registry key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the worm runs every time Windows starts.

  4. Creates a file called %Windir%\Temp\b6.log. This is a zip file that contains a copy of the worm.

  5. Creates a file called %Windir%\codm. This is a base64-encoded copy of the zip file mentioned in step 4.

  6. Creates a file called %Windir%\cts2. This file contains email addresses collected from the computer.

  7. Overwrites some files with the following text:

    -=breaKer_CUk-

  8. Starts Internet Explorer with a JPEG image file located on the domain www.pornprone.com.

  9. Sends itself to email addresses collected from the computer. The email has the following characteristics:

    Subject:
    (One of the following)
    • Re:FW:Es ist unm glich, es soviel ...:P zu sein, es zu sehen
    • Re:FW:Besserer Idiot des Jahres, um es zu sehen
    • Re:FW:Die schlechtere Sache des Jahres, um es zu sehen
    • Re:FW:Was wir immer ... wollten:), um es zu sehen
    • Re:FW:Weil das wert ist, es zu sehen
    • Re:FW:Es gibt kein Leben ohne Tod ...: (, um es zu sehen
    • Re:FW:Preis!:D, um es zu sehen
    • Re:FW:Hilfe bitte!:), um es zu sehen
    • Re:FW:Besser Witz des Jahres:), um es zu sehen
    • Re:FW:Besseres Foto des Jahres;), um es zu sehen
    • Re:FW: impossyvel su-lo tanto... :P, vu-lo
    • Re:FW:O mas idiota, vu-lo
    • Re:FW:O pior do ano, vu-lo
    • Re:FW:O que sempre quisemos... :). vu-lo
    • Re:FW:Pois vale. vu-lo
    • Re:FW:Nuo hs vida sem morte... :(, vu-lo
    • Re:FW:Prumio!!!! :D, vu-lo
    • Re:FW:Ajuda a ajudar-te... :), vu-lo
    • Re:FW:Melhor anedota do ano :),vu-lo
    • Re:FW:Melhor Foto do ano ;), vu-lo
    • Re:FW:impossibile a sia tanto... :P, vederlo
    • Re:FW:Idiot migliore dell'anno, vederlo
    • Re:FW:La cosa pi?ettosa dell'anno, vederla
    • Re:FW:Che cosa abbiamo desiderato sempre... :), vederli
    • Re:FW:(none)
    • Re:FW:Non ci vita senza morte... :(, vederla
    • Re:FW:Premio! :D, vederlo
    • Re:FW:Sussidio per favore! :), per vederlo
    • Re:FW:Scherzo migliore dell'anno:), per vederlo
    • Re:FW:Foto migliore dell'anno;), per vederla
    • Re:FW:It is impossible to be it as much... :P, to see it
    • Re:FW:Better idiot of the year, to see it
    • Re:FW:The worse thing of the year, to see it
    • Re:FW:What we always wanted...:), to see it
    • Re:FW:Because it is worth ,to see it
    • Re:FW:There is no life without death... :(, to see it
    • Re:FW:Prize! :D, to see it
    • Re:FW:Aid please! :), to see it
    • Re:FW:Better joke of the year:), to see it
    • Re:FW:Better Photo of the year;), to see it
    • Re:FW:Il est impossible d' tre cela tant de ...:P, le voir
    • Re:FW:Le meilleur idiot de l'annue, pour le voir
    • Re:FW:La chose plus mauvaise de l'annue, pour le voir
    • Re:FW:Ce que nous voulions toujours... :), pour le voir
    • Re:FW:Parce qu'il vaut, le voir
    • Re:FW:Il n'y a aucune vie sans mort... : (, pour le voir
    • Re:FW:Prix! :D, pour le voir
    • Re:FW:Aide s'il vous plait! :), pour le voir
    • Re:FW:Mieux plaisanterie de l'annue :), pour le voir
    • Re:FW:Meilleure Photo de l'annue;), pour le voir
    • Re:FW:Es imposible serlo tanto... :P, miralo
    • Re:FW:Mejor chorrada del a o, miralo
    • Re:FW:Lo peor del a o, miralo
    • Re:FW:Lo que siempre quisimos... :). miralo
    • Re:FW:Pues vale. miralo
    • Re:FW:No hay vida sin muerte... :(, miralo
    • Re:FW:Premio!!!! :D, miralo
    • Re:FW:Ayudame a ayudarte... :), miralo
    • Re:FW:Mejor chiste del a o :),miralo
    • Re:FW:Mejor Foto del a o ;), miralo


      Message body:
      (One of the following)
    • Kaspersky-Antivirus.
      Kein Virus Gefundenes
      State:Ok
    • Symantec-Antivirus.
      Noo Vyrus.
      State:Ok
    • Symantec-Antivirus.
      Nessun Virus Found.
      State:Ok
    • Kaspersky-Antivirus.
      No Virus Found.
      State:Ok
    • F-Secure-Antivirus.
      Aucun Virus Constat
      State:Ok
    • Panda ActiveScan-Antivirus.
      No se encontraron virus.
      Estado:Ok


      Attachment:
      A zip file containing a copy of the worm. The file will have one of the following names:
    • Eskannnichtsein.zip
    • Kielraum2004.zip
    • Schlechter2004.zip
    • Daswarniewie das.zip
    • tatAutos.zip
    • Heiligtum.zip
    • ck.zip
    • Witz2004.zip
    • Foto2004.zip
    • opodeser.zip
    • tonto2004.zip
    • pior2004.zip
    • nuncafoiassim.zip
    • explodecarros.zip
    • metocou.zip
    • felicidade.zip
    • anedota2004.zip
    • foto2004.zip
    • stupido2004.zip
    • Peggiore2004.zip
    • utilizzadelleautomobili.zip
    • Santuario.zip
    • L'hotoccato.zip
    • Scherzo2004.zip
    • Itcannotbe.zip
    • Bilge2004.zip
    • Worse2004.zip
    • Itwasneverlikethat.zip
    • exploitscars.zip
    • Sanctuary.zip
    • Ihavetouched it.zip
    • Happiness.zip
    • Joke2004.zip
    • photo2004.zip
    • Renflement2004.zip
    • Plusmauvais2004.zip
    • Exploitedesvoitures.zip
    • Sanctuaire.zip
    • Bonheur.zip
    • Plaisanterie2004.zip
    • Photo2004.zip
    • nopuedeser.zip
    • pegote2004.zip
    • peor2004.zip
    • jamasfueasi.zip
    • rebientacoches.zip
    • santuario.zip
    • mehatocado.zip
    • felicidad.zip
    • chiste2004.zip


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: Fergal Ladley

Discovered: December 22, 2004
Updated: February 13, 2007 12:26:12 PM
Also Known As: Email-Worm.Breacuk.a [Kaspersk, W32/Breacuk.a@MM [McAfee], W32/Beaker-A [Sophos], WORM_BEAKER.A [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. Restart the computer in Safe mode or VGA mode.
  4. Run a full system scan and delete all the files detected as W32.Beaker.A@mm.
  5. Reverse the changes made to the registry.
For 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:
Note:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, re-enable 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 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 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. To restart the computer in Safe mode or VGA mode
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
  • For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
  • For Windows NT 4 users, restart the computer in VGA mode.

4. 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.Beaker.A@mm, record their names (which you will later need to reverse the changes made to the registry), and then click Delete.


5. To reverse the changes made to 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 keys only. Read the document, "How to make a backup of the Windows registry," for instructions.

  1. Click Start > Run.
  2. Type regedit

    Then click OK.

  3. Navigate to the keys:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "[5 random lower-case characters]"="[file detected in step 4 as W32.Beaker.A@mm]"

  5. Exit the Registry Editor.

  6. Restart the computer in Normal mode. For instructions, read the section on returning to Normal mode in the document, "How to start the computer in Safe Mode."


Writeup By: Fergal Ladley