BDS/Hupigon.E.201 - Backdoor Server

See also

Summary

Full description

Statistics

Virus:	BDS/Hupigon.E.201
Date discovered:	22/06/2006
Type:	Backdoor Server
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	348.550 Bytes
MD5 checksum:	641802385471e1a59e43531570b7d328
VDF version:	6.35.00.58 - Thu, 22 Jun 2006 11:23 (GMT+1)
IVDF version:	6.35.00.66 - Sat, 24 Jun 2006 07:08 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Mcafee: BackDoor-AWQ.b.dr
   • Kaspersky: Backdoor.Win32.Hupigon.bqp
   • TrendMicro: BKDR_HUPIGON.NP
   • F-Secure: Backdoor.Win32.Hupigon.bqp
   • Sophos: Troj/Hupigo-BLN
   • Bitdefender: Backdoor.Hupigon.E

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

Side effects:
   • Downloads a file
   • Drops malicious files
   • Records keystrokes
   • Registry modification
   • Steals information
   • Third party control

Files It copies itself to the following location:
• %WINDIR%\WMAPAD.exe

It deletes the initially executed copy of itself.

The following files are created:

– %WINDIR%\uninstal.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
– %WINDIR%\WMAPAD.DLL Further investigation pointed out that this file is malware, too. Detected as: BDS/Hupigon.E.1

– %WINDIR%\WMAPADKey.Dll
– %WINDIR%\WMAPADKey.log This file contains collected keystrokes.

It tries to download a file:

– The location is the following:
• www.mycoue.com/gz/**********
This file may contain further download locations and might serve as source for new threats.

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

– [HKLM\SYSTEM\ControlSet001\Services\WMAEditServer]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\WMAPAD.exe"
   • "DisplayName"="WMAEditServer"
   • "ObjectName"="LocalSystem"
   • "Description"="ÏµÍ³Ä¬ÈÏÓ°Òô±à¼¹¤¾ß"

– [HKLM\SYSTEM\ControlSet001\Services\WMAEditServer\Security]
   • "Security"=%hex values%

– [HKLM\SYSTEM\ControlSet001\Services\WMAEditServer\Enum]
   • "0"="Root\LEGACY_WMAEDITSERVER\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001

The following registry keys are changed:

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   Old value:
   • "Check_Associations"=%user defined settings%
   New value:
   • "Check_Associations"="yes"

– [HKCU\Software\Microsoft\Internet Connection Wizard]
   Old value:
   • "Completed"=%user defined settings%
   New value:
   • "Completed"=hex:01,00,00,00

Backdoor Contact server:
The following:
• %URL from downloaded file%

Remote control capabilities:
• Start keylog

Injection – It injects the following file into a process: WMAPAD.DLL

    Process name:
   • iexplore.exe

– It injects the following file into a process: WMAPADKey.DLL

    Process name:
   • %all running processes%

Rootkit Technology Hides the following:
– Its own files
– Its own registry key

Method used:
• Hidden from Windows API

File details Programming language:
The malware program was written in Delphi.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Adriana Popa on Wed, 23 Aug 2006 15:29 (GMT+1)
Description updated by Adriana Popa on Thu, 24 Aug 2006 10:42 (GMT+1)

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