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Date discovered:20/07/2010
Type:Backdoor Server
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
File size:225.280 Bytes
MD5 checksum:9D54DAC390CCC67FFE0F6D57728B27D4
VDF version:
IVDF version:

 General Method of propagation:
   • No own spreading routine

   •  TrendMicro: TROJ_BUZUS.AVM
   •  Sophos: Mal/Ainslot-B
   •  Microsoft: Worm:Win32/Ainslot.A

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7

Side effects:
   • Third party control
   • Drops files
   • Lowers security settings
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %APPDATA%\taskhost.exe

The following file is created:

– %APPDATA%\data.dat This file contains collected keystrokes.

 Registry To each registry key one of the values is added in order to run the processes after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   • "WindowsDefender"="%APPDATA%\taskhost.exe"

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "WindowsDefender"="%APPDATA%\taskhost.exe"

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "WindowsDefender"="%APPDATA%\taskhost.exe"

–  [HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\
   • "StubPath"="%APPDATA%\taskhost.exe"

–  [HKCU\Software\Microsoft\Active Setup\Installed Components\
   • "StubPath"="%APPDATA%\taskhost.exe"

The following registry keys are added:

– [HKCU\Software\VB and VBA Program Settings\SrvID\ID]
   • "BCVT4V1PVD"="ZBOTNETkillz"

– [HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
   • "BCVT4V1PVD"="%current date%"

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   • "%executed file%"="%executed file%:*:Enabled:Windows Messanger"
   • "%APPDATA%\taskhost.exe"="%APPDATA%\taskhost.exe:*:Enabled:Windows Messanger"

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   • "DoNotAllowExceptions"=dword:00000000

 Backdoor Contact server:
The following:

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

Sends information about:
    • Capture screen
    • Information about the Windows operating system

Remote control capabilities:
    • Start keylog
    • Visit a website

 Stealing – A logging routine is started after the following website is visited, which contains one of the following substrings in the URL:

 Injection – It injects itself as a remote thread into a process.

    Process name:
   • explorer.exe

 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 the following runtime packer:
   • UPX

Descrição enviada por Andrei Ilie em quinta-feira, 28 de julho de 2011
Descrição atualizada por Andrei Ilie em quinta-feira, 4 de agosto de 2011

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