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Virus:TR/Agent.161824
Date discovered:09/01/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:161.840 Bytes
MD5 checksum:e1e01f442eb5be19f7bc10ff0b03954f
IVDF version:7.01.01.92 - Friday, January 9, 2009

 General Aliases:
   •  Sophos: W32/AutoAEU-Gen
   •  Panda: Trj/Qhost.KE
   •  Eset: Win32/AutoRun.Agent.GI
   •  Bitdefender: Trojan.Generic.1323408


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


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It deletes the initially executed copy of itself.



It deletes the following file:
   • %TEMPDIR%\94e35516f74aa47b05add02c6e0de7b8.bat



The following files are created:

%TEMPDIR%\94e35516f74aa47b05add02c6e0de7b8.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
%SYSDIR%\abfdcfedc.dll



It tries to download a file:

– The location is the following:
   • http://wl.dwen24.com/v306/**********
At the time of writing this file was not online for further investigation.

 Registry One of the following values is added in order to run the process after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\
   abfdcfedc]
   • "Asynchronous"=dword:0x00000001
   • "DllName"="%SYSDIR%\abfdcfedc.dll"
   • "Impersonate"=dword:0x00000000
   • "Lock"="lck"
   • "Logoff"="lf"
   • "Logon"="l"
   • "Shutdown"="sd"
   • "StartScreenSaver"="sss"
   • "StartShell"="ss"
   • "Startup"="sup"
   • "StopScreenSaver"="stsss"
   • "Unlock"="u"



The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Blud"="%character string%"

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

    Process name:
   • winlogon.exe


 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Friday, February 26, 2010
Description updated by Andrei Ivanes on Tuesday, March 2, 2010

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