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Virus:WORM/Ainslot.A.765
Date discovered:11/05/2011
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:531.456 Bytes
MD5 checksum:3140795504ABA167F4011EE5285A1CF8
VDF version:7.11.07.229 - Wednesday, May 11, 2011
IVDF version:7.11.07.229 - Wednesday, May 11, 2011

 General Method of propagation:
    Autorun feature


Aliases:
   •  Kaspersky: Trojan.Win32.Agent.nchq
   •  Sophos: Mal/VB-YB
     Microsoft: Worm:Win32/Ainslot.A


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


Side effects:
   • Drops files
   • Registry modification

 Files It copies itself to the following locations:
   • %APPDATA%\Directory\upx.exe
   • %APPDATA%\Windows_Defender.exe



The following file is created:

%APPDATA%\data.dat Contains parameters used by the malware.

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

  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "upx"="%APPDATA%\Directory\upx.exe"

  [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   Run]
   • "upx"="%APPDATA%\Directory\upx.exe"

  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   run]
   • "Windows_Defender"="%APPDATA%\Windows_Defender.exe"

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

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



The following registry keys are added:

[HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\
   {BE8ADF1D-EAEF-ACAB-3EFA-CAEABAAE3A1F}]
   • "StubPath"="%APPDATA%\Windows_Defender.exe"

[HKCU\Software\Microsoft\Active Setup\Installed Components\
   {BE8ADF1D-EAEF-ACAB-3EFA-CAEABAAE3A1F}]
   • "StubPath"="%APPDATA%\Windows_Defender.exe"

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

    Process name:
   • explorer.exe


 Miscellaneous Accesses internet resources:
   • londex.zapto.org

 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.

Description inserted by Andrei Ilie on Tuesday, October 11, 2011
Description updated by Andrei Ilie on Wednesday, October 12, 2011

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