Infostealer.Wowcraft.B

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Discovered: October 22, 2005
Updated: February 13, 2007 12:54:15 PM
Also Known As: Troj/WowPWS-A [Sophos], PWSteal.Wowcraft.B
Type: Trojan Horse
Systems Affected: Windows


Infostealer.Wowcraft.B is a password-stealing Trojan horse that attempts to steal passwords for the World of Warcraft game and send them to a remote attacker.

NOTE : Definitions prior to May 10, 2006 may detect this threat as PWSteal.Wowcraft.B

Antivirus Protection Dates

  • Initial Rapid Release version October 22, 2005
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version October 22, 2005
  • Latest Daily Certified version August 09, 2016 revision 001
  • Initial Weekly Certified release date October 26, 2005

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

Writeup By: Hyun Choi

Discovered: October 22, 2005
Updated: February 13, 2007 12:54:15 PM
Also Known As: Troj/WowPWS-A [Sophos], PWSteal.Wowcraft.B
Type: Trojan Horse
Systems Affected: Windows


Once Infostealer.Wowcraft.B is executed, it performs the following actions:

  1. Copies itself as one of the following files:

    • %Windir%\smss.exe
    • %System%\rundll32.com
    • %System%\finder.com
    • %Windir%\finder.com
    • %System%\command.pif
    • %ProgramFiles%\Internet Explorer\iexplore.com
    • %ProgramFiles%\Common Files\iexplore.pif
    • %Windir%\1.com
    • %Windir%\ExERoute.exe
    • %System%\MSCONFIG.COM
    • %System%\dxdiag.com
    • %System%\regedit.com
    • %Windir%\Debug\DebugProgram.exe
    • %windir%\explorer.com
    • C:\MSCONFIG.SYS


      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).
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
    • %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.

  2. Adds the value:

    "Torjan Program" = "C:\WINNT\smss.exe"

    to the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN
    HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUNSERVICES

    so that it runs every time Windows starts.

  3. Overwrites the value to:

    "Shell" = "Explorer.exe 1"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon

  4. Overwrites the value to:

    "(Default)" = "C:\Program Files\Internet Explorer\iexplore.com" %1

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Applications\iexplore.exe\shell\open\command

  5. Overwrites the value to:

    "(Default)"  = "%SystemRoot%\explorer.com"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Drive\shell\find\command

  6. Overwrites the value to:

    "(Default)" = "C:\Program Files\Internet Explorer\iexplore.com" %1

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ftp\shell\open\command

  7. Overwrites the value to:

    "(Default)" = %systemroot%\System32\rundll32.com setupapi,InstallHinfSection, DefaultInstall 132 %1

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\inffile\shell\install\command

  8. Overwrites the value to:

    "(Default)" = "C:\Program Files\common~1\iexplore.pif"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\iexplore.pif\shell\open\command

  9. Overwrites the value to:

    "command" = "rundll32.com appwiz.cpl,NewLinkHere %1"

    in the registry subkey:

    HKEY_CLASSES_ROOT\.lnk\ShellNew

  10. Overwrites the value to:

    "command" = "%SystemRoot%\system32\rundll32.com %SystemRoot%\system32\syncui.dll,Briefcase_Create %2!d! %1"

    in the registry subkey:

    HKEY_CLASSES_ROOT\.bfc\shellnew

  11. Overwrites the value to:

    "(Default)" = "rundll32.com shell32.dll,Control_RunDLL %1,%*"

    in the registry subkey:

    HKEY_CLASSES_ROOT\cplfile\shell\cplopen\command

  12. Overwrites the value to:

    "(Default)" = "%SystemRoot%\system32\rundll32.com NETSHELL.DLL,InvokeDunFile %1"

    in the registry subkey:

    HKEY_CLASSES_ROOT\dunfile\shell\open\command

  13. Overwrites the value to:

    "(Default)" = "rundll32.com url.dll,FileProtocolHandler %l"

    in the registry subkey:

    HKEY_CLASSES_ROOT\file\shell\open\command

  14. Overwrites the value to:

    "(Default)" = ""C:\Program Files\Microsoft Office\Office\msohtmed.exe" /p %1"

    in the registry subkey:

    HKEY_CLASSES_ROOT\htmlfile\shell\print\command

  15. Overwrites the value to:

    "(Default)" = "%SystemRoot%\System32\rundll32.com setupapi,InstallHinfSection DefaultInstall 132 %1"

    in the registry subkey:

    HKEY_CLASSES_ROOT\inffile\shell\Install\command

  16. Overwrites the value to:

    "(Default)" = "finder.com shdocvw.dll,OpenURL %l"

    in the registry subkey:

    HKEY_CLASSES_ROOT\InternetShortcut\shell\open\command

  17. Overwrites the value to:

    "(Default)" = "finder.com desk.cpl,InstallScreenSaver %l"

    in the registry subkey:

    HKEY_CLASSES_ROOT\scrfile\shell\install\command

  18. Overwrites the value to:

    "(Default)" = ""C:\WINNT\System32\finder.com" C:\WINNT\System32\scrobj.dll,GenerateTypeLib "%1""

    in the registry subkey:

    HKEY_CLASSES_ROOT\scriptletfile\Shell\Generate Typelib\command

  19. Overwrites the value to:

    "(Default)" = "finder.com url.dll,TelnetProtocolHandler %l"

    in the registry subkey:

    HKEY_CLASSES_ROOT\telnet\shell\open\command

  20. Overwrites the value to:

    "(Default)" = "%SystemRoot%\system32\finder.com %SystemRoot%\system32\shell32.dll,OpenAs_RunDLL %1"

    in the registry subkey:

    HKEY_CLASSES_ROOT\Unknown\shell\openas\command

  21. Overwrites the value to:

    "(Default)" = "%SystemRoot%\system32\rundll32.com NETSHELL.DLL,InvokeDunFile %1"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\dunfile\shell\open\command

  22. Overwrites the value to:

    "(Default)" = "finder.com shdocvw.dll,OpenURL %l"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\InternetShortcut\shell\open\command

  23. Overwrites the value to:

    "(Default)" = "finder.com desk.cpl,InstallScreenSaver %l"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\scrfile\shell\install\command

  24. Overwrites the value to:

    "(Default)" = "%SystemRoot%\system32\finder.com %SystemRoot%\system32\shell32.dll,OpenAs_RunDLL %1"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Unknown\shell\openas\command

  25. Overwrites the value to:

    "command" = "C:\WINNT\System32\command.pif"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSInfo\ToolSets\MSInfo\hdwwiz\

  26. Overwrites the value to:

    "(Default)" = ""C:\Program Files\common~1\iexplore.pif""

    in the registry subkey:

    HKEY_CLASSES_ROOT\htmlfile\shell\opennew\command

  27. Overwrites the value to:

    "(Default)" = ""C:\Program Files\common~1\iexplore.pif" -nohome"

    in the registry subkey:

    HKEY_CLASSES_ROOT\http\shell\open\command

  28. Overwrites the value to:

    "(Default)" = ""C:\Program Files\common~1\iexplore.pif" -nohome"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\http\shell\open\command

  29. Overwrites the value to:

    "(Default)" = "%1"

    in the registry subkey:

    HKEY_CLASSES_ROOT\winfiles\defaulticon

  30. Overwrites the value to:

    "(Default)" = "C:\WINNT\ExERoute.exe "%1" %*"

    in the registry subkey:

    HKEY_CLASSES_ROOT\winfiles\shell\open\command

  31. Overwrites the value to:

    "(Default)" = "winfiles"

    in the registry subkey:

    HKEY_CLASSES_ROOT\.exe

  32. Attempts to log key strokes upon finding windows associated with the following domains:

    • us.logon.worldofwarcraft.com
    • eu.logon.worldofwarcraft.com

  33. Emails the logged online World of Warcraft passwords to a remote attacker.

  34. Attempts to disable processes or windows which contain the following strings, some of which may be security related:

    • RAV
    • CCENTER
    • ASSISTSE
    • KPFWSVC
    • AGENTSVR
    • KV
    • KREG
    • IEFIND
    • IPARMOR
    • UPHC
    • PFW
    • RULEWIZE
    • FYGT
    • RFWMA

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: Hyun Choi

Discovered: October 22, 2005
Updated: February 13, 2007 12:54:15 PM
Also Known As: Troj/WowPWS-A [Sophos], PWSteal.Wowcraft.B
Type: Trojan Horse
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.
  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:
Note:
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 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 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.


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, click Delete.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do 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 the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and 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.

    Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

  4. Navigate to the subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN
    HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUNSERVICES

  5. In the right pane, delete the value:

    "Torjan Program" = "C:\WINNT\smss.exe"

  6. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon

  7. In the right pane, delete the value:

    "Shell" = "Explorer.exe 1"

  8. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Applications\iexplore.exe\shell\open\command

  9. In the right pane, delete the value:

    "(Default)" = "C:\Program Files\Internet Explorer\iexplore.com" %1

  10. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Drive\shell\find\command

  11. In the right pane, delete the value:

    "(Default)"  = "%SystemRoot%\explorer.com"

  12. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ftp\shell\open\command

  13. In the right pane, delete the value:

    "(Default)" = "C:\Program Files\Internet Explorer\iexplore.com" %1

  14. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\inffile\shell\install\command

  15. In the right pane, delete the value:

    "(Default)" = %systemroot%\System32\rundll32.com setupapi,InstallHinfSection, DefaultInstall 132 %1

  16. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\iexplore.pif\shell\open\command

  17. In the right pane, delete the value:

    "(Default)" = "C:\Program Files\common~1\iexplore.pif"

  18. Navigate to the subkey:

    HKEY_CLASSES_ROOT\.lnk\ShellNew

  19. In the right pane, delete the value:

    "command" = "rundll32.com appwiz.cpl,NewLinkHere %1"

  20. Navigate to the subkey:

    HKEY_CLASSES_ROOT\.bfc\shellnew

  21. In the right pane, delete the value:

    "command" = "%SystemRoot%\system32\rundll32.com %SystemRoot%\system32\syncui.dll,Briefcase_Create %2!d! %1"

  22. Navigate to the subkey:

    HKEY_CLASSES_ROOT\cplfile\shell\cplopen\command

  23. In the right pane, delete the value:

    "(Default)" = "rundll32.com shell32.dll,Control_RunDLL %1,%*"

  24. Navigate to the subkey:

    HKEY_CLASSES_ROOT\dunfile\shell\open\command

  25. In the right pane, delete the value:

    "(Default)" = "%SystemRoot%\system32\rundll32.com NETSHELL.DLL,InvokeDunFile %1"

  26. Navigate to the subkey:

    HKEY_CLASSES_ROOT\file\shell\open\command

  27. In the right pane, delete the value:

    "(Default)" = "rundll32.com url.dll,FileProtocolHandler %l"

  28. Navigate to the subkey:

    HKEY_CLASSES_ROOT\htmlfile\shell\print\command

  29. In the right pane, delete the value:

    "(Default)" = ""C:\Program Files\Microsoft Office\Office\msohtmed.exe" /p %1"

  30. Navigate to the subkey:

    HKEY_CLASSES_ROOT\inffile\shell\Install\command

  31. In the right pane, delete the value:

    "(Default)" = "%SystemRoot%\System32\rundll32.com setupapi,InstallHinfSection DefaultInstall 132 %1"

  32. Navigate to the subkey:

    HKEY_CLASSES_ROOT\InternetShortcut\shell\open\command

  33. In the right pane, delete the value:

    "(Default)" = "finder.com shdocvw.dll,OpenURL %l"

  34. Navigate to the subkey:

    HKEY_CLASSES_ROOT\scrfile\shell\install\command

  35. In the right pane, delete the value:

    "(Default)" = "finder.com desk.cpl,InstallScreenSaver %l"

  36. Navigate to the subkey:

    HKEY_CLASSES_ROOT\scriptletfile\Shell\Generate Typelib\command

  37. In the right pane, delete the value:

    "(Default)" = ""C:\WINNT\System32\finder.com" C:\WINNT\System32\scrobj.dll,GenerateTypeLib "%1""

  38. Navigate to the subkey:

    HKEY_CLASSES_ROOT\telnet\shell\open\command

  39. In the right pane, delete the value:

    "(Default)" = "finder.com url.dll,TelnetProtocolHandler %l"

  40. Navigate to the subkey:

    HKEY_CLASSES_ROOT\Unknown\shell\openas\command

  41. In the right pane, delete the value:

    "(Default)" = "%SystemRoot%\system32\finder.com %SystemRoot%\system32\shell32.dll,OpenAs_RunDLL %1"

  42. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\dunfile\shell\open\command

  43. In the right pane, delete the value:

    "(Default)" = "%SystemRoot%\system32\rundll32.com NETSHELL.DLL,InvokeDunFile %1"

  44. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\InternetShortcut\shell\open\command

  45. In the right pane, delete the value:

    "(Default)" = "finder.com shdocvw.dll,OpenURL %l"

  46. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\scrfile\shell\install\command

  47. In the right pane, delete the value:

    "(Default)" = "finder.com desk.cpl,InstallScreenSaver %l"

  48. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Unknown\shell\openas\command

  49. In the right pane, delete the value:

    "(Default)" = "%SystemRoot%\system32\finder.com %SystemRoot%\system32\shell32.dll,OpenAs_RunDLL %1"

  50. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSInfo\ToolSets\MSInfo\hdwwiz\

  51. In the right pane, delete the value:

    "command" = "C:\WINNT\System32\command.pif"

  52. Navigate to the subkey:

    HKEY_CLASSES_ROOT\htmlfile\shell\opennew\command

  53. In the right pane, delete the value:

    "(Default)" = ""C:\Program Files\common~1\iexplore.pif""

  54. Navigate to the subkey:

    HKEY_CLASSES_ROOT\http\shell\open\command

  55. In the right pane, delete the value:

    "(Default)" = ""C:\Program Files\common~1\iexplore.pif" -nohome"

  56. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\http\shell\open\command

  57. In the right pane, delete the value:

    "(Default)" = ""C:\Program Files\common~1\iexplore.pif" -nohome"

  58. Navigate to the subkey:

    HKEY_CLASSES_ROOT\winfiles\defaulticon

  59. In the right pane, delete the value:

    "(Default)" = "%1"

  60. Navigate to the subkey:

    HKEY_CLASSES_ROOT\winfiles\shell\open\command

  61. In the right pane, delete the value:

    "(Default)" = "C:\WINNT\ExERoute.exe "%1" %*"

  62. Navigate to the subkey:

    HKEY_CLASSES_ROOT\.exe

  63. In the right pane, delete the value:

    "(Default)" = "winfiles"

  64. Exit the Registry Editor.


Writeup By: Hyun Choi