BackDoor.Huai.6890

Technical Information

To ensure autorun and distribution:

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\windows.asp] 'Start' = '00000002'

Malicious functions:

Creates and executes the following:

%CommonProgramFiles%\Microsoft Shared\MSInfo\Server101.exe

Executes the following:

<SYSTEM32>\dumprep.exe 3812 -dm 7 7 %TEMP%\WER7ac7.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3812 -dm 7 7 %TEMP%\WER7ac7.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3760 -dm 7 7 %TEMP%\WER43b3.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3916 -dm 7 7 %TEMP%\WERce3b.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3864 -dm 7 7 %TEMP%\WER944a.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3864 -dm 7 7 %TEMP%\WER944a.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3640 -dm 7 7 %TEMP%\WERf00f.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3640 -dm 7 7 %TEMP%\WERf00f.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3584 -dm 7 7 %TEMP%\WERd946.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3760 -dm 7 7 %TEMP%\WER43b3.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3708 -dm 7 7 %TEMP%\WER2b4b.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3708 -dm 7 7 %TEMP%\WER2b4b.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3916 -dm 7 7 %TEMP%\WERce3b.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 412 -dm 7 7 %TEMP%\WER890c.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 1752 -dm 7 7 %TEMP%\WER58ab.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 1752 -dm 7 7 %TEMP%\WER58ab.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 552 -dm 7 7 %TEMP%\WERb068.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 552 -dm 7 7 %TEMP%\WERb068.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 412 -dm 7 7 %TEMP%\WER890c.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 4032 -dm 7 7 %TEMP%\WER1fd4.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3968 -dm 7 7 %TEMP%\WERe6c3.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3968 -dm 7 7 %TEMP%\WERe6c3.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 4084 -dm 7 7 %TEMP%\WER3897.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 4084 -dm 7 7 %TEMP%\WER3897.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 4032 -dm 7 7 %TEMP%\WER1fd4.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3584 -dm 7 7 %TEMP%\WERd946.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3084 -dm 7 7 %TEMP%\WER7604.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3084 -dm 7 7 %TEMP%\WER7604.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3032 -dm 7 7 %TEMP%\WER5953.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3192 -dm 7 7 %TEMP%\WERcb04.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3140 -dm 7 7 %TEMP%\WERacbd.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3140 -dm 7 7 %TEMP%\WERacbd.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\cmd.exe /c "%CommonProgramFiles%\Microsoft Shared\MSINFO\DelSvel.bat"
<SYSTEM32>\dumprep.exe 2864 -dm 7 7 %TEMP%\WER2aa7.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\calc.exe
<SYSTEM32>\dumprep.exe 3032 -dm 7 7 %TEMP%\WER5953.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\rundll32.exe <SYSTEM32>\sysdm.cpl,NoExecuteProcessException <SYSTEM32>\calc.exe
<SYSTEM32>\dumprep.exe 2864 -dm 7 7 %TEMP%\WER2aa7.dir00\calc.exe.hdmp 16325836412027120
<SYSTEM32>\dumprep.exe 3192 -dm 7 7 %TEMP%\WERcb04.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3480 -dm 7 7 %TEMP%\WER8716.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3424 -dm 7 7 %TEMP%\WER6eed.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3424 -dm 7 7 %TEMP%\WER6eed.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3532 -dm 7 7 %TEMP%\WERbdb9.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3532 -dm 7 7 %TEMP%\WERbdb9.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3480 -dm 7 7 %TEMP%\WER8716.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3312 -dm 7 7 %TEMP%\WER195c.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3252 -dm 7 7 %TEMP%\WERe3bd.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3252 -dm 7 7 %TEMP%\WERe3bd.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3372 -dm 7 7 %TEMP%\WER312c.dir00\calc.exe.hdmp 16325836412027112
<SYSTEM32>\dumprep.exe 3372 -dm 7 7 %TEMP%\WER312c.dir00\calc.exe.mdmp 16325836412027100
<SYSTEM32>\dumprep.exe 3312 -dm 7 7 %TEMP%\WER195c.dir00\calc.exe.hdmp 16325836412027112

Injects code into

the following system processes:

<SYSTEM32>\calc.exe

Modifies file system :

Creates the following files:

%TEMP%\WER7ac7.dir00\calc.exe.mdmp
%TEMP%\WER7ac7.dir00\calc.exe.hdmp
%TEMP%\WER7ac7.dir00\appcompat.txt
%TEMP%\WER43b3.dir00\calc.exe.hdmp
%TEMP%\WER43b3.dir00\appcompat.txt
%TEMP%\WER43b3.dir00\manifest.txt
%TEMP%\WER944a.dir00\appcompat.txt
%TEMP%\WER944a.dir00\manifest.txt
%TEMP%\WERce3b.dir00\calc.exe.mdmp
%TEMP%\WER7ac7.dir00\manifest.txt
%TEMP%\WER944a.dir00\calc.exe.mdmp
%TEMP%\WER944a.dir00\calc.exe.hdmp
%TEMP%\WERf00f.dir00\calc.exe.mdmp
%TEMP%\WERf00f.dir00\calc.exe.hdmp
%TEMP%\WERf00f.dir00\appcompat.txt
%TEMP%\WERd946.dir00\calc.exe.hdmp
%TEMP%\WERd946.dir00\appcompat.txt
%TEMP%\WERd946.dir00\manifest.txt
%TEMP%\WER2b4b.dir00\appcompat.txt
%TEMP%\WER2b4b.dir00\manifest.txt
%TEMP%\WER43b3.dir00\calc.exe.mdmp
%TEMP%\WERf00f.dir00\manifest.txt
%TEMP%\WER2b4b.dir00\calc.exe.mdmp
%TEMP%\WER2b4b.dir00\calc.exe.hdmp
%TEMP%\WER58ab.dir00\calc.exe.mdmp
%TEMP%\WER58ab.dir00\calc.exe.hdmp
%TEMP%\WER58ab.dir00\appcompat.txt
%TEMP%\WER3897.dir00\calc.exe.hdmp
%TEMP%\WER3897.dir00\appcompat.txt
%TEMP%\WER3897.dir00\manifest.txt
%TEMP%\WER890c.dir00\appcompat.txt
%TEMP%\WER890c.dir00\manifest.txt
%TEMP%\WERb068.dir00\calc.exe.mdmp
%TEMP%\WER58ab.dir00\manifest.txt
%TEMP%\WER890c.dir00\calc.exe.mdmp
%TEMP%\WER890c.dir00\calc.exe.hdmp
%TEMP%\WERe6c3.dir00\calc.exe.mdmp
%TEMP%\WERe6c3.dir00\calc.exe.hdmp
%TEMP%\WERe6c3.dir00\appcompat.txt
%TEMP%\WERce3b.dir00\calc.exe.hdmp
%TEMP%\WERce3b.dir00\appcompat.txt
%TEMP%\WERce3b.dir00\manifest.txt
%TEMP%\WER1fd4.dir00\appcompat.txt
%TEMP%\WER1fd4.dir00\manifest.txt
%TEMP%\WER3897.dir00\calc.exe.mdmp
%TEMP%\WERe6c3.dir00\manifest.txt
%TEMP%\WER1fd4.dir00\calc.exe.mdmp
%TEMP%\WER1fd4.dir00\calc.exe.hdmp
%TEMP%\WERacbd.dir00\calc.exe.mdmp
%TEMP%\WERacbd.dir00\calc.exe.hdmp
%TEMP%\WERacbd.dir00\appcompat.txt
%TEMP%\WER7604.dir00\calc.exe.hdmp
%TEMP%\WER7604.dir00\appcompat.txt
%TEMP%\WER7604.dir00\manifest.txt
%TEMP%\WERcb04.dir00\appcompat.txt
%TEMP%\WERcb04.dir00\manifest.txt
%TEMP%\WERe3bd.dir00\calc.exe.mdmp
%TEMP%\WERacbd.dir00\manifest.txt
%TEMP%\WERcb04.dir00\calc.exe.mdmp
%TEMP%\WERcb04.dir00\calc.exe.hdmp
%TEMP%\WER2aa7.dir00\calc.exe.mdmp
%TEMP%\WER2aa7.dir00\calc.exe.hdmp
%TEMP%\WER2aa7.dir00\appcompat.txt
%CommonProgramFiles%\Microsoft Shared\MSInfo\Server101.exe
<SYSTEM32>\_Server101.exe
%CommonProgramFiles%\Microsoft Shared\MSInfo\DelSvel.bat
%TEMP%\WER5953.dir00\appcompat.txt
%TEMP%\WER5953.dir00\manifest.txt
%TEMP%\WER7604.dir00\calc.exe.mdmp
%TEMP%\WER2aa7.dir00\manifest.txt
%TEMP%\WER5953.dir00\calc.exe.mdmp
%TEMP%\WER5953.dir00\calc.exe.hdmp
%TEMP%\WER8716.dir00\calc.exe.mdmp
%TEMP%\WER8716.dir00\calc.exe.hdmp
%TEMP%\WER8716.dir00\appcompat.txt
%TEMP%\WER6eed.dir00\calc.exe.hdmp
%TEMP%\WER6eed.dir00\appcompat.txt
%TEMP%\WER6eed.dir00\manifest.txt
%TEMP%\WERbdb9.dir00\appcompat.txt
%TEMP%\WERbdb9.dir00\manifest.txt
%TEMP%\WERd946.dir00\calc.exe.mdmp
%TEMP%\WER8716.dir00\manifest.txt
%TEMP%\WERbdb9.dir00\calc.exe.mdmp
%TEMP%\WERbdb9.dir00\calc.exe.hdmp
%TEMP%\WER195c.dir00\calc.exe.mdmp
%TEMP%\WER195c.dir00\calc.exe.hdmp
%TEMP%\WER195c.dir00\appcompat.txt
%TEMP%\WERe3bd.dir00\calc.exe.hdmp
%TEMP%\WERe3bd.dir00\appcompat.txt
%TEMP%\WERe3bd.dir00\manifest.txt
%TEMP%\WER312c.dir00\appcompat.txt
%TEMP%\WER312c.dir00\manifest.txt
%TEMP%\WER6eed.dir00\calc.exe.mdmp
%TEMP%\WER195c.dir00\manifest.txt
%TEMP%\WER312c.dir00\calc.exe.mdmp
%TEMP%\WER312c.dir00\calc.exe.hdmp

Sets the 'hidden' attribute to the following files:

<SYSTEM32>\_Server101.exe
%CommonProgramFiles%\Microsoft Shared\MSInfo\Server101.exe

Deletes itself.

Network activity:

Connects to:

'ky###.py8.cn':80

TCP:

HTTP GET requests:

ky###.py8.cn/ip.txt

UDP:

DNS ASK ky###.py8.cn

Miscellaneous:

Searches for the following windows:

ClassName: 'TRE1001HS' WindowName: ''
ClassName: 'Shell_TrayWnd' WindowName: ''
ClassName: 'MS_WINHELP' WindowName: ''

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