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Virus:TR/Drop.OnLin.gdy.2
Date discovered:26/02/2009
Type:Trojan
Subtype:Dropper
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:166.692 Bytes
MD5 checksum:ebfc3ae2c815f51cceb0031fc5ffcb3a
IVDF version:7.01.02.90 - Thursday, February 26, 2009

 General Method of propagation:
• Autorun feature


Aliases:
   •  Mcafee: Generic PWS.ak trojan
   •  Sophos: Mal/EncPk-HI
   •  Panda: W32/Lineage.KDF
   •  Eset: Win32/PSW.OnLineGames.NNU
   •  Bitdefender: Trojan.PWS.OnLineGames.KCNQ


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


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

 Files It copies itself to the following locations:
   • %drive%\93to.bat
   • %SYSDIR%\oukdfgr.exe



It deletes the initially executed copy of itself.



The following files are created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%SYSDIR%\bgdferw0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.OnLineGa.gdy

%SYSDIR%\hyrteas0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Online.gdy.2




It tries to download a file:

– The location is the following:
   • http://vfgbs.com/hg2/**********
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:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "hjdsdse"="%SYSDIR%\oukdfgr.exe"



The following registry keys are added:

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\TypeLib]
   • "@"="{F171A442-7AF5-43E1-AFED-EDC826A1B0F5}"
   • "Version"="1.0"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\HELPDIR]
   • "@"="%SYSDIR%\"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1]
   • "@"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0]
   • "@"="IEHelper 1.0 Type Library"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid]
   • "@"="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\FLAGS]
   • "@"="0"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}\ProxyStubClsid32]
   • "@"="{00020424-0000-0000-C000-000000000046}"

– [HKLM\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\
   ProgID]
   • "@"="IEHlprObj.IEHlprObj.1"

– [HKLM\SOFTWARE\Classes\CLSID\
   {F171A450-7AF5-43E1-AFED-EDC826A1B0F5}]
   • "@"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\Interface\
   {F171A44F-7AF5-43E1-AFED-EDC826A1B0F5}]
   • "@"="IIEHlprObj"

– [HKLM\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\
   VersionIndependentProgID]
   • "@"="IEHlprObj.IEHlprObj"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj\CurVer]
   • "@"="IEHlprObj.IEHlprObj.1"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1\CLSID]
   • "@"="{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}"

– [HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj]
   • "@"="IEHlprObj Class"

– [HKLM\SOFTWARE\Classes\TypeLib\
   {F171A442-7AF5-43E1-AFED-EDC826A1B0F5}\1.0\0\win32]
   • "@"="%SYSDIR%\bgdferw0.dll"

– [HKLM\SOFTWARE\Classes\CLSID\{F171A450-7AF5-43E1-AFED-EDC826A1B0F5}\
   InprocServer32]
   • "@"="%SYSDIR%\bgdferw0.dll"
   • "ThreadingModel"="Apartment"



The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Connections]
   New value:
   • "DefaultConnectionSettings"=hex:46,00,00,00,04,00,00,00,09,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00,00,00,F0,2D,E8,A3,74,79,CA,01,00,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,02,00,00,00,C0,A8,6B,64,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

 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 Thursday, December 10, 2009
Description updated by Petre Galan on Thursday, December 10, 2009

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