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Virus:TR/PSW.Magania.dgao
Date discovered:16/05/2010
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:130.048 Bytes
MD5 checksum:9e9428f5c40bc62a0f5e7d2fa0f82e55
IVDF version:7.10.07.112 - Sunday, May 16, 2010

 General Method of propagation:
    Autorun feature


Aliases:
   •  Sophos: Mal/Taterf-B
   •  Bitdefender: Trojan.Generic.3914410
   •  Panda: W32/Lineage.LLS
   •  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%\n1m.exe
   • %SYSDIR%\eset.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %SYSDIR%\eset0.dll
   • %TEMPDIR%\at.exe
   • %TEMPDIR%\at1.rar



The following files are created:

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

%SYSDIR%\eset0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Magania.dgaw

%TEMPDIR%\at.exe
%temporary internet files%\at1[1].rar
%temporary internet files%\at[1].rar
%SYSDIR%\post.exe
%SYSDIR%\post0.dll
%TEMPDIR%\at1.rar



It tries to download some files:

The location is the following:
   • http://www.googlexct.com/1tw/**********


The location is the following:
   • http://www.googleasw.com/1tw/**********




It tries to executes the following files:

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


Filename:
   • "%TEMPDIR%\at.exe"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "esetsos"="%SYSDIR%\eset.exe"
   • "postsos"="%SYSDIR%\post.exe"



The following registry key is added:

[HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="agfeq.n"



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%\eset0.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%\post0.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.

Description inserted by Petre Galan on Wednesday, August 4, 2010
Description updated by Petre Galan on Wednesday, August 4, 2010

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