Virus:Worm/Goldun.A
Date discovered:12/09/2005
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:20.049 Bytes
MD5 checksum:a1f9189a474ca1b73dff4ebe05621981
VDF version:6.31.1.230

 General Method of propagation:
   • Peer to Peer


Aliases:
   •  Kaspersky: P2P-Worm.Win32.Goldun.a
   •  TrendMicro: WORM_GOLDUN.A
   •  Bitdefender: BehavesLike:Win32.ExplorerHijack


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops malicious files
   • Records keystrokes
   • Registry modification
   • Steals information

 Files – %SYSDIR%\mcfCC4.dll Further investigation pointed out that this file is malware, too.
– %SYSDIR%\mcfdrv.sys Further investigation pointed out that this file is malware, too.

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\
   mcfCC4]
   • "DllName"="mcfCC4.dll"
   • "Startup"="mcfCC4"
   • "Impersonate"=dword:00000001
   • "Asynchronous"=dword:00000001
   • "MaxWait"=dword:00000001
   • "key4"="[117985925899296[CurrentUser]"



The following registry keys are added in order to load the services after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\mcfdrv]
   • "Type"=dword:00000001
   • "Start"=dword:00000001
   • "ErrorControl"=dword:00000000
   • "ImagePath"=%SYSDIR%\mcfdrv.sys
   • "DisplayName"="MCFservice"

– [HKLM\SYSTEM\CurrentControlSet\Services\mcfdrv\Enum]
   • "0"="Root\LEGACY_MCFDRV\\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\mcfdrv\Security]
   • "Security"=hex:01,00,14,80,90,00,00,00,9c,00,00,00,14,00,00,00,30,00,00,00,02,\
      00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,\
      00,00,02,00,60,00,04,00,00,00,00,00,14,00,fd,01,02,00,01,01,00,00,00,00,00,\
      05,12,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\
      20,02,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,05,0b,00,00,00,00,\
      00,18,00,fd,01,02,00,01,02,00,00,00,00,00,05,20,00,00,00,23,02,00,00,01,01,\
      00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00



The following registry keys are added:

– [HKCU\Software\iMesh\Client\LocalContent]
   • "DlDir0"="%SYSDIR%\User Local Files"

– [HKCU\Software\Kazaa\LocalContent]
   • "DlDir0"="%SYSDIR%\User Local Files"

– [HKCU\Software\Kazaa\Transfer]
   • "dir0"="012345:%SYSDIR%\User Local Files"



The following registry keys are changed:

– [HKCU\Software\iMesh\Client\LocalContent]
   Old value:
   • "Dir0"="012345:%user defined settings%"
   New value:
   • "Dir0"="012345:%SYSDIR%\User Local Files"

– [HKCU\Software\Kazaa\LocalContent]
   Old value:
   • "Dir0"="012345:%user defined settings%"
   New value:
   • "Dir0"="012345:%SYSDIR%\User Local Files"

– [HKCU\Software\iMesh\Client\LocalContent]
   Old value:
   • "DisableSharing"=%user defined settings%
   New value:
   • "DisableSharing"=dword:00000000

– [HKCU\Software\Kazaa\LocalContent]
   Old value:
   • "DisableSharing"=%user defined settings%
   New value:
   • "DisableSharing"=dword:00000000

– [HKCU\Software\Kazaa\Transfer]
   Old value:
   • "DlDir0"=%user defined settings%
   New value:
   • "DlDir0"="%SYSDIR%\User Local Files"

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:  


– It searches for the following directory:
   • %SYSDIR%\User Local Files\

   If successful, the following files are created:
   • NAV2005_Keygen!.exe; NAV_updates__05.exe; XXX_teens_16-18.exe;
      WindowsXP boost.exe; photoshop__2005.exe;
      ana**********ex_photos.exe; TheBat!7.51.256.exe;
      NortonAntiVirus.exe; DrWEB_Key092007.exe; LAN_hacker_ver2.exe;
      NeT_KILLER_3.84.exe; julia_XXX_video.exe; Kaspersky_KEY08.exe;
      HACKER'S View 2.exe; Mozilla_1.9.927.exe; ProfessionalICQ.exe


 Backdoor Contact server:
The following:
   • www.**********selwyn.com/IMAGES/PHOTOS/ppages/data.php

As a result it may send some information. This is done via the HTTP GET and POST method using a PHP script.


Sends information about:
    • Created logfiles
    • Current user
    • Platform ID

 Stealing – A logging routine is started after one of the following websites are visited:
   • https://www.e-**********.com/acct/balance.asp
   • https://www.e-**********.com/acct/accountinfo.asp

– It captures:
    • Window information
    • Login information

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • FSG 1.33

Description inserted by Oliver Auerbach on Monday, September 12, 2005
Description updated by Iulia Diaconescu on Tuesday, September 13, 2005

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