Virus:BDS/Pahador.O.11
Date discovered:16/02/2006
Type:Backdoor Server
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:761.398 Bytes
MD5 checksum:8a7228dc214aa02de17beef20E1289f7
VDF version:6.33.00.234

 General Method of propagation:
   • No own spreading routine


Alias:
   •  Kaspersky: Backdoor.Win32.Pahador.o


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


Side effects:
   • Records keystrokes
   • Registry modification
   • Steals information
   • Third party control

 Files It copies itself to the following locations:
   • %recycle bin%\services.exe
   • %malware execution directory%\tempst.exe

 Registry It creates the following entry in order to bypass the Windows XP firewall:

– HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List
   • "%recycle bin%\services.exe"="%recycle
      bin%\services.exe:*:Enabled:services.exe"



The following registry key is changed:

– HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   Old value:
   • Shell"="explorer.exe"
   New value:
   • Shell"="explorer.exe %empty spaces% %recycle bin%\services.exe"

 Process termination Processes containing one of the following window class names are terminated:
   • TApplication
   • PX22Xsgt6
   • TForm1


 Backdoor Contact server:
The following:
   • http://appmsg.gadu-gadu.pl/appsvc/**********

As a result it may send information and remote control could be provided.

 Miscellaneous Mutex:
It creates the following Mutex:
   • MSCTF.TimListMUTEX.

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

Description inserted by Irina Boldea on Wednesday, March 22, 2006
Description updated by Irina Boldea on Wednesday, March 22, 2006

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