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Virus:TR/PSW.Magania.dkcm
Date discovered:18/06/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:188.928 Bytes
MD5 checksum:3ce93d5b411717ff64eaae252ceca514
IVDF version:7.10.03.156

 General Method of propagation:
    Autorun feature


Aliases:
   •  Sophos: Mal/Taterf-B
   •  Bitdefender: Trojan.Generic.4218614
   •  Panda: W32/Lineage.LLU
   •  Eset: Win32/PSW.OnLineGames.OUM


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


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

 Files It copies itself to the following locations:
   • %drive%\qvf.exe
   • %SYSDIR%\ahnabc.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %TEMPDIR%\ah.exe
   • %TEMPDIR%\ah1.rar
   • %SYSDIR%\ahnabc0.dll



The following files are created:

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

%TEMPDIR%\ah1.rar
%TEMPDIR%\ah.exe
%SYSDIR%\risabc.exe
%SYSDIR%\risabc0.dll
%SYSDIR%\risie0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ASPM.Gen

%SYSDIR%\ahnabc0.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Taterf

%temporary internet files%\ah1[1].rar
%temporary internet files%\ah[1].rar
%SYSDIR%\ahnie0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PWS.OnLineGames.AH




It tries to download some files:

The location is the following:
   • http://www.googled3r.com/1hg/**********


The location is the following:
   • http://www.baiduqxt.com/1hg/**********




It tries to execute the following files:

Filename:
   • %SYSDIR%\regsvr32.exe /s %SYSDIR%\ahnie0.dll


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


Filename:
   • "%TEMPDIR%\ah.exe"


Filename:
   • %SYSDIR%\regsvr32.exe /s %SYSDIR%\risie0.dll

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "ahncsos"="%SYSDIR%\ahnabc.exe"
   • "rissos"="%SYSDIR%\risabc.exe"



The following registry keys are added:

[HKLM\SOFTWARE\Classes\CLSID\{70F6E582-8FF4-4082-829E-C172131DE31A}\
   VersionIndependentProgID]
   • "@"="IEHlprObj.IEHlprObj"

[HKLM\SOFTWARE\Classes\TypeLib\
   {70F6E522-8FF4-4082-829E-C172131DE31A}\1.0]
   • "@"="IEHelper 1.0 Type Library"

[HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}\ProxyStubClsid]
   • "@"="{00020424-0000-0000-C000-000000000046}"

[HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0\0\win32]
   • "@"="%SYSDIR%\risie0.dll"

[HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}]
   • "@"="IIEHlprObj"

[HKLM\SOFTWARE\Classes\Interface\
   {70F6E583-8FF4-4082-829E-C172131DE31A}\TypeLib]
   • "@"="{70F6E522-8FF4-4082-829E-C172131DE31A}"
   • "Version"="1.0"

[HKLM\SOFTWARE\Classes\Interface\
   {70F6E583-8FF4-4082-829E-C172131DE31A}\ProxyStubClsid32]
   • "@"="{00020424-0000-0000-C000-000000000046}"

[HKLM\SOFTWARE\Classes\TypeLib\
   {70F6E522-8FF4-4082-829E-C172131DE31A}\1.0\HELPDIR]
   • "@"="%SYSDIR%\"

[HKLM\SOFTWARE\Classes\CLSID\{70F6E582-8FF4-4082-829E-C172131DE31A}\
   ProgID]
   • "@"="IEHlprObj.IEHlprObj.1"

[HKLM\SOFTWARE\Classes\Interface\
   {70F6E583-8FF4-4082-829E-C172131DE31A}]
   • "@"="IIEHlprObj"

[HKLM\SOFTWARE\Classes\CLSID\
   {5DA743EA-6725-4ADE-BF17-C328743011FD}]
   • "@"="IEHlprObj Class"

[HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0\FLAGS]
   • "@"="0"

[HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}\ProxyStubClsid32]
   • "@"="{00020424-0000-0000-C000-000000000046}"

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

[HKLM\SOFTWARE\Classes\CLSID\{70F6E582-8FF4-4082-829E-C172131DE31A}\
   InprocServer32]
   • "@"="%SYSDIR%\ahnie0.dll"
   • "ThreadingModel"="Apartment"

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

[HKLM\SOFTWARE\Classes\CLSID\MNDOWN]
   • "urlinfo"="chedfr.m"

[HKLM\SOFTWARE\Classes\CLSID\{5DA743EA-6725-4ADE-BF17-C328743011FD}\
   ProgID]
   • "@"="IEHlprObj.IEHlprObj.1"

[HKLM\SOFTWARE\Classes\CLSID\
   {70F6E582-8FF4-4082-829E-C172131DE31A}]
   • "@"="IEHlprObj Class"

[HKLM\SOFTWARE\Classes\IEHlprObj.IEHlprObj.1\CLSID]
   • "@"="{5DA743EA-6725-4ADE-BF17-C328743011FD}"

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

[HKLM\SOFTWARE\Classes\TypeLib\
   {70F6E522-8FF4-4082-829E-C172131DE31A}\1.0\0\win32]
   • "@"="%SYSDIR%\ahnie0.dll"

[HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0]
   • "@"="IEHelper 1.0 Type Library"

[HKLM\SOFTWARE\Classes\CLSID\{5DA743EA-6725-4ADE-BF17-C328743011FD}\
   VersionIndependentProgID]
   • "@"="IEHlprObj.IEHlprObj"

[HKLM\SOFTWARE\Classes\TypeLib\
   {70F6E522-8FF4-4082-829E-C172131DE31A}\1.0\FLAGS]
   • "@"="0"

[HKLM\SOFTWARE\Classes\Interface\
   {70F6E583-8FF4-4082-829E-C172131DE31A}\ProxyStubClsid]
   • "@"="{00020424-0000-0000-C000-000000000046}"

[HKLM\SOFTWARE\Classes\Interface\
   {5DA743EB-6725-4ADE-BF17-C328743011FD}\TypeLib]
   • "@"="{5DA7432B-6725-4ADE-BF17-C328743011FD}"
   • "Version"="1.0"

[HKLM\SOFTWARE\Classes\TypeLib\
   {5DA7432B-6725-4ADE-BF17-C328743011FD}\1.0\HELPDIR]
   • "@"="%SYSDIR%\"

[HKLM\SOFTWARE\Classes\CLSID\{5DA743EA-6725-4ADE-BF17-C328743011FD}\
   InprocServer32]
   • "@"="%SYSDIR%\risie0.dll"
   • "ThreadingModel"="Apartment"



The following registry keys are changed:

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:0x00000091

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

 Injection –  It injects the following file into a process: %SYSDIR%\ahnabc0.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%\risabc0.dll

    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.

Descripción insertada por Petre Galan el lunes 27 de septiembre de 2010
Descripción actualizada por Petre Galan el lunes 27 de septiembre de 2010

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