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Virus:TR/Drop.Small.gic
Date discovered:29/09/2010
Type:Trojan
Subtype:Dropper
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:177.664 Bytes
MD5 checksum:a8aa2d8016e798f5cdb6d45aaf338b38
VDF version:7.10.05.110
IVDF version:7.10.12.62 - Wednesday, September 29, 2010

 General Aliases:
   •  Mcafee: Artemis!A8AA2D8016E7
   •  Kaspersky: Trojan-Dropper.Win32.Small.gic
   •  Bitdefender: Worm.Generic.276456
   •  Panda: W32/Lineage.LNT
   •  GData: Worm.Generic.276456


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


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

 Files It copies itself to the following location:
   • %TEMPDIR%\apiqq.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %TEMPDIR%\am.exe
   • %TEMPDIR%\am1.rar



The following files are created:

%TEMPDIR%\apiqq0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Agent.bq.137

%SYSDIR%\arking0.dll
%SYSDIR%\arking.exe



It tries to download some files:

– The location is the following:
   • http://www.baiduww9.com/1mg/**********
It is saved on the local hard drive under: %TEMPDIR%\am.exe

– The location is the following:
   • http://www.baiduww9.com/1mg/**********
It is saved on the local hard drive under: %TEMPDIR%\am1.rar



It tries to execute the following files:

– Filename:
   • %PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE


– Filename:
   • %TEMPDIR%\am.exe

 Registry The following registry key is added in order to run the process after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "King_ar"="%SYSDIR%\arking.exe"
   • "api32"="%TEMPDIR%\apiqq.exe"



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="dsdvwq.z"

 Injection –  It injects the following file into a process: %TEMPDIR%\apiqq0.dll

    Process name:
   • explorer.exe



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

    Process name:
   • iexplore.exe



–  It injects the following file into a process: %SYSDIR%\arking0.dll

    Process name:
   • explorer.exe


 Miscellaneous Accesses internet resources:
   • http://www.163lou.com/1mg/**********

 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 Petre Galan on Tuesday, April 12, 2011
Description updated by Petre Galan on Tuesday, April 12, 2011

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