BDS/Hupigon.bsw - Backdoor Server

See also

Summary

Full description

Statistics

Virus:	BDS/Hupigon.bsw
Date discovered:	14/07/2006
Type:	Backdoor Server
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	511.488 Bytes
MD5 checksum:	39086acf09522704e1e4f924076fa9ca
VDF version:	6.35.00.164 - Fri, 14 Jul 2006 07:38 (GMT+1)
IVDF version:	6.35.00.203 - Sun, 23 Jul 2006 16:08 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Mcafee: BackDoor-AVW
   • Kaspersky: Backdoor.Win32.Hupigon.bsw
   • TrendMicro: BKDR_HUPIGON.VH
   • F-Secure: Backdoor.Win32.Hupigon.bsw
   • Bitdefender: Backdoor.Hupigon.XB

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

Side effects:
   • Disable security applications
   • Drops malicious files
   • Lowers security settings
   • Registry modification
   • Third party control

Right after execution the following information is displayed:

Files It copies itself to the following locations:
   • %SYSDIR%\fservice.exe
   • %SYSDIR%\sservice.exe
   • %WINDIR%\services.exe

It deletes the initially executed copy of itself.

The following files are created:

– %malware execution directory%\%executed file%.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
– %SYSDIR%\winkey.dll Further investigation pointed out that this file is malware, too. Detected as: BDS/Probat.bs.DLL2

– %SYSDIR%\reginv.dll Further investigation pointed out that this file is malware, too. Detected as: BDS/Probat.B.77.A

– %WINDIR%\ktd32.atm This file contains collected keystrokes.

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "DirectX For Microsoft® Windows"="%SYSDIR%\fservice.exe"

The following registry keys are added:

– [HKCU\Software\Microsoft\Windows NT Script Host\Microsoft DxDiag\
   WinSettings]
   • "Bulas"="1"
   • "FW_KILL"="1"
   • "XP_FW_Disable"="1"
   • "XP_SYS_Recovery"="1"
   • "ICQ_UIN"=""
   • "ICQ_UIN2"=""
   • "Kurban_Ismi"="whbuhl"
   • "Mail"=""
   • "Online_List"="iuuq;..`ev`v/odughslr/bnl.bfh,cho.qsns`u/bfh"
   • "Port"="4001"
   • "Sifre"="032547"
   • "Hata"=""
   • "KSil"="1"
   • "LanNotifie"=""

– [HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\
   {5Y99AE78-58TT-11dW-BE53-Y67078979Y}]
   • "StubPath"="%SYSDIR%\sservice.exe"

The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • "Shell"="Explorer.exe "
   New value:
   • "Shell"="Explorer.exe %SYSDIR%\fservice.exe"

Deactivate Windows XP Firewall:
– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\CurrentControlSet\Services\srservice]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\ControlSet001\Services\srservice]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

Process termination List of services that are disabled:
   • wscsvc
   • sharedaccess
   • srservice
   • navapsvc

Backdoor The following ports are opened:

– services.exe on TCP port 5110 in order to provide backdoor capabilities.
– services.exe on TCP port 5112 in order to provide an FTP server.
– services.exe on TCP port 51100 in order to provide an FTP server.

Contact server:
The following:
   • http://adwaw.netfirms.com/cgi-bin/**********

As a result it may send information and remote control could be provided. This is done via the HTTP GET request on a CGI script.

Sends information about:
    • Cached passwords
    • Computer name
    • CPU speed
    • CPU type
    • IP address
    • Opened port
    • System time
    • visited URLs
    • Information about the Windows operating system

Remote control capabilities:
    • Abort connection
    • Change directory
    • Delete file
    • Directory listing
    • Edit registry
    • Execute file
    • Send emails

Stealing It tries to steal the following information:

– Passwords from the following programs:
   • CuteFTP
   • FlashFXP
   • Trillian
   • Microsoft Outlook Express
   • Yahoo Messenger
   • MSNMessenger
   • NetMeeting

Injection – It injects the following file into a process: winkey.dll

    Process name:
   • %all running processes%

– It injects the following file into a process: reginv.dll

    Process name:
   • %processes that have visible windows%

File details Programming language:
The malware program was written in MS Visual C++.

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, 06 Sep 2006 10:34 (GMT+1)
Description updated by Adriana Popa on Wed, 13 Sep 2006 15:01 (GMT+1)

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