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Date discovered:22/02/2010
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:356.352 Bytes
MD5 checksum:56f3aeaee60d5b1d7c5f28484e534a8b
IVDF version:

 General Aliases:
   •  Mcafee: W32/Autorun.worm.c
   •  Sophos: Troj/VBInj-F
   •  Panda: W32/Spybot.AKB
   •  Eset: Win32/Dursg.A
   •  Bitdefender: Trojan.Generic.3233186

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

Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %HOME%\Application Data\SystemProc\lsass.exe

It deletes the initially executed copy of itself.

The following files are created:

%PROGRAM FILES%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome\content\timer.xul Further investigation pointed out that this file is malware, too. Detected as: JS/Dursg.F

%PROGRAM FILES%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\install.rdf
%PROGRAM FILES%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome.manifest

It tries to executes the following file:

– Filename:
   • "C:\Documents and Settings\Administrator\Application Data\SystemProc\lsass.exe"

 Registry The following registry key is added:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   • "RTHDBPL"="%HOME%\Application Data\SystemProc\lsass.exe"

The following registry key is changed:

– [HKCU\Identities]
   New value:
   • "Curr version"="12"
   • "First Start"=""
   • "Inst Date"="%character string%"
   • "KillSelf"=""
   • "Last Date"="%character string%"
   • "Popup count"="0"
   • "Popup date"="0"
   • "Popup time"="0"
   • "Send Inst"="ok"

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

    Process name:
   • explorer.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 Wednesday, April 7, 2010
Description updated by Petre Galan on Wednesday, April 7, 2010

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