BDS/Beast202.1 - Backdoor Server

See also

Summary

Full description

Statistics

Virus:	BDS/Beast202.1
Type:	Backdoor Server
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	54.100 Bytes
MD5 checksum:	55ff7e888a996e7eac6416041f4d1e7e

General Method of propagation:
   • No own spreading routine

Aliases:
   • Mcafee: BackDoor-AMQ
   • Kaspersky: Backdoor.Win32.Beastdoor.aq
   • F-Secure: W32/Beastdoor.AJ
   • Grisoft: BackDoor.Beastdoor.FG
   • Bitdefender: GenPack:Backdoor.Beastdoor.2.0.2.A

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

Side effects:
   • Drops a file
   • Lowers security settings
   • Registry modification
   • Third party control

Files It copies itself to the following locations:
   • %SYSDIR%\ñsrss.exe
   • %SYSDIR%\mspjgq.com
   • %WINDIR%\msagent\msytdn.com

The following file is created:

– Non malicious file:
   • %SYSDIR%\pjgq.blf

Registry The following registry keys are continuously in an infinite loop added in order to run the processes after reboot.

– [HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\
   {42AC0312-EE51-A3CC-EA32-40AA12E6115C}]
   • "StubPath"="%SYSDIR%\mspjgq.com"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "COM Service"="%WINDIR%\msagent\msytdn.com"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   Run]
   • "COM Service"="%WINDIR%\msagent\msytdn.com"

The following registry key is added:

– [HKCU\Software\Microsoft\Internet Explorer\Toolbar\Explorer]
   • "ITBarLayout"=%hex values%

The following registry keys are changed:

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

– [HKCU\Software\Microsoft\RAS Autodial\Control]
   Old value:
   • "LoginSessionDisable"=%user defined settings%
   New value:
   • "LoginSessionDisable"=dword:00000001

Backdoor The following port is opened:

– %SYSDIR%\ñsrss.exe on TCP port 6666 in order to provide backdoor capabilities.

Contact server:
The following:
   • cdwar.hut1.ru/cgi-bin/baza/user/add/admin/**********

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

Sends information about:
    • Capture screen
    • Current user
    • IP address
    • Current malware status
    • Opened port

Remote control capabilities:
    • Restart system
    • Shut down system

DoS Right after it becomes active, it starts DoS attacks against the following destinations:
• microsoft.com
• nea.fr

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 the following runtime packer:
• UPX

See a brief description here.

Description inserted by Daniel Constantin on Mon, 06 Feb 2006 11:50 (GMT+1)
Description updated by Daniel Constantin on Thu, 09 Feb 2006 13:42 (GMT+1)

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