├── .gitattributes ├── .gitignore ├── Code Cave.sln ├── Code Cave ├── Code Cave.vcxproj ├── Code Cave.vcxproj.filters ├── main.cpp └── main.h ├── README.md └── Shellcode ├── Shellcode.vcxproj ├── Shellcode.vcxproj.filters ├── main.c └── main.h /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). Diff markers may cause the following 21 | # file extensions to fail to load in VS. An alternative would be to treat 22 | # these files as binary and thus will always conflict and require user 23 | # intervention with every merge. To do so, just uncomment the entries below 24 | ############################################################################### 25 | #*.sln merge=binary 26 | #*.csproj merge=binary 27 | #*.vbproj merge=binary 28 | #*.vcxproj merge=binary 29 | #*.vcproj merge=binary 30 | #*.dbproj merge=binary 31 | #*.fsproj merge=binary 32 | #*.lsproj merge=binary 33 | #*.wixproj merge=binary 34 | #*.modelproj merge=binary 35 | #*.sqlproj merge=binary 36 | #*.wwaproj merge=binary 37 | 38 | ############################################################################### 39 | # behavior for image files 40 | # 41 | # image files are treated as binary by default. 42 | ############################################################################### 43 | #*.jpg binary 44 | #*.png binary 45 | #*.gif binary 46 | 47 | ############################################################################### 48 | # diff behavior for common document formats 49 | # 50 | # Convert binary document formats to text before diffing them. This feature 51 | # is only available from the command line. Turn it on by uncommenting the 52 | # entries below. 53 | ############################################################################### 54 | #*.doc diff=astextplain 55 | #*.DOC diff=astextplain 56 | #*.docx diff=astextplain 57 | #*.DOCX diff=astextplain 58 | #*.dot diff=astextplain 59 | #*.DOT diff=astextplain 60 | #*.pdf diff=astextplain 61 | #*.PDF diff=astextplain 62 | #*.rtf diff=astextplain 63 | #*.RTF diff=astextplain 64 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | ## 4 | ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore 5 | 6 | # User-specific files 7 | *.rsuser 8 | *.suo 9 | *.user 10 | *.userosscache 11 | *.sln.docstates 12 | 13 | # User-specific files (MonoDevelop/Xamarin Studio) 14 | *.userprefs 15 | 16 | # Build results 17 | [Dd]ebug/ 18 | [Dd]ebugPublic/ 19 | [Rr]elease/ 20 | [Rr]eleases/ 21 | x64/ 22 | x86/ 23 | [Aa][Rr][Mm]/ 24 | [Aa][Rr][Mm]64/ 25 | bld/ 26 | [Bb]in/ 27 | [Oo]bj/ 28 | [Ll]og/ 29 | 30 | # Visual Studio 2015/2017 cache/options directory 31 | .vs/ 32 | # Uncomment if you have tasks that create the project's static files in wwwroot 33 | #wwwroot/ 34 | 35 | # Visual Studio 2017 auto generated files 36 | Generated\ Files/ 37 | 38 | # MSTest test Results 39 | [Tt]est[Rr]esult*/ 40 | [Bb]uild[Ll]og.* 41 | 42 | # NUNIT 43 | *.VisualState.xml 44 | TestResult.xml 45 | 46 | # Build Results of an ATL Project 47 | [Dd]ebugPS/ 48 | [Rr]eleasePS/ 49 | dlldata.c 50 | 51 | # Benchmark Results 52 | BenchmarkDotNet.Artifacts/ 53 | 54 | # .NET Core 55 | project.lock.json 56 | project.fragment.lock.json 57 | artifacts/ 58 | 59 | # StyleCop 60 | StyleCopReport.xml 61 | 62 | # Files built by Visual Studio 63 | *_i.c 64 | *_p.c 65 | *_h.h 66 | *.ilk 67 | *.meta 68 | *.obj 69 | *.iobj 70 | *.pch 71 | *.pdb 72 | *.ipdb 73 | *.pgc 74 | *.pgd 75 | *.rsp 76 | *.sbr 77 | *.tlb 78 | *.tli 79 | *.tlh 80 | *.tmp 81 | *.tmp_proj 82 | *_wpftmp.csproj 83 | *.log 84 | *.vspscc 85 | *.vssscc 86 | .builds 87 | *.pidb 88 | *.svclog 89 | *.scc 90 | 91 | # Chutzpah Test files 92 | _Chutzpah* 93 | 94 | # Visual C++ cache files 95 | ipch/ 96 | *.aps 97 | *.ncb 98 | *.opendb 99 | *.opensdf 100 | *.sdf 101 | *.cachefile 102 | *.VC.db 103 | *.VC.VC.opendb 104 | 105 | # Visual Studio profiler 106 | *.psess 107 | *.vsp 108 | *.vspx 109 | *.sap 110 | 111 | # Visual Studio Trace Files 112 | *.e2e 113 | 114 | # TFS 2012 Local Workspace 115 | $tf/ 116 | 117 | # Guidance Automation Toolkit 118 | *.gpState 119 | 120 | # ReSharper is a .NET coding add-in 121 | _ReSharper*/ 122 | *.[Rr]e[Ss]harper 123 | *.DotSettings.user 124 | 125 | # JustCode is a .NET coding add-in 126 | .JustCode 127 | 128 | # TeamCity is a build add-in 129 | _TeamCity* 130 | 131 | # DotCover is a Code Coverage Tool 132 | *.dotCover 133 | 134 | # AxoCover is a Code Coverage Tool 135 | .axoCover/* 136 | !.axoCover/settings.json 137 | 138 | # Visual Studio code coverage results 139 | *.coverage 140 | *.coveragexml 141 | 142 | # NCrunch 143 | _NCrunch_* 144 | .*crunch*.local.xml 145 | nCrunchTemp_* 146 | 147 | # MightyMoose 148 | *.mm.* 149 | AutoTest.Net/ 150 | 151 | # Web workbench (sass) 152 | .sass-cache/ 153 | 154 | # Installshield output folder 155 | [Ee]xpress/ 156 | 157 | # DocProject is a documentation generator add-in 158 | DocProject/buildhelp/ 159 | DocProject/Help/*.HxT 160 | DocProject/Help/*.HxC 161 | DocProject/Help/*.hhc 162 | DocProject/Help/*.hhk 163 | DocProject/Help/*.hhp 164 | DocProject/Help/Html2 165 | DocProject/Help/html 166 | 167 | # Click-Once directory 168 | publish/ 169 | 170 | # Publish Web Output 171 | *.[Pp]ublish.xml 172 | *.azurePubxml 173 | # Note: Comment the next line if you want to checkin your web deploy settings, 174 | # but database connection strings (with potential passwords) will be unencrypted 175 | *.pubxml 176 | *.publishproj 177 | 178 | # Microsoft Azure Web App publish settings. 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Backup files are not needed, 240 | # because we have git ;-) 241 | _UpgradeReport_Files/ 242 | Backup*/ 243 | UpgradeLog*.XML 244 | UpgradeLog*.htm 245 | ServiceFabricBackup/ 246 | *.rptproj.bak 247 | 248 | # SQL Server files 249 | *.mdf 250 | *.ldf 251 | *.ndf 252 | 253 | # Business Intelligence projects 254 | *.rdl.data 255 | *.bim.layout 256 | *.bim_*.settings 257 | *.rptproj.rsuser 258 | *- Backup*.rdl 259 | 260 | # Microsoft Fakes 261 | FakesAssemblies/ 262 | 263 | # GhostDoc plugin setting file 264 | *.GhostDoc.xml 265 | 266 | # Node.js Tools for Visual Studio 267 | .ntvs_analysis.dat 268 | node_modules/ 269 | 270 | # Visual Studio 6 build log 271 | *.plg 272 | 273 | # Visual Studio 6 workspace options file 274 | *.opt 275 | 276 | # Visual Studio 6 auto-generated workspace file (contains which files were open etc.) 277 | *.vbw 278 | 279 | # Visual Studio LightSwitch build output 280 | **/*.HTMLClient/GeneratedArtifacts 281 | **/*.DesktopClient/GeneratedArtifacts 282 | **/*.DesktopClient/ModelManifest.xml 283 | **/*.Server/GeneratedArtifacts 284 | **/*.Server/ModelManifest.xml 285 | _Pvt_Extensions 286 | 287 | # Paket dependency manager 288 | .paket/paket.exe 289 | paket-files/ 290 | 291 | # FAKE - F# Make 292 | .fake/ 293 | 294 | # JetBrains Rider 295 | .idea/ 296 | *.sln.iml 297 | 298 | # CodeRush personal settings 299 | .cr/personal 300 | 301 | # Python Tools for Visual Studio (PTVS) 302 | __pycache__/ 303 | *.pyc 304 | 305 | # Cake - Uncomment if you are using it 306 | # tools/** 307 | # !tools/packages.config 308 | 309 | # Tabs Studio 310 | *.tss 311 | 312 | # Telerik's JustMock configuration file 313 | *.jmconfig 314 | 315 | # BizTalk build output 316 | *.btp.cs 317 | *.btm.cs 318 | *.odx.cs 319 | *.xsd.cs 320 | 321 | # OpenCover UI analysis results 322 | OpenCover/ 323 | 324 | # Azure Stream Analytics local run output 325 | ASALocalRun/ 326 | 327 | # MSBuild Binary and Structured Log 328 | *.binlog 329 | 330 | # NVidia Nsight GPU debugger configuration file 331 | *.nvuser 332 | 333 | # MFractors (Xamarin productivity tool) working folder 334 | .mfractor/ 335 | 336 | # Local History for Visual Studio 337 | .localhistory/ 338 | 339 | # BeatPulse healthcheck temp database 340 | healthchecksdb -------------------------------------------------------------------------------- /Code Cave.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.29709.97 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Code Cave", "Code Cave\Code Cave.vcxproj", "{B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}" 7 | EndProject 8 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Shellcode", "Shellcode\Shellcode.vcxproj", "{E195F177-18C6-4673-A8D1-D38CAF7D2AAD}" 9 | EndProject 10 | Global 11 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 12 | Debug|x64 = Debug|x64 13 | Debug|x86 = Debug|x86 14 | Release|x64 = Release|x64 15 | Release|x86 = Release|x86 16 | EndGlobalSection 17 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 18 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Debug|x64.ActiveCfg = Debug|x64 19 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Debug|x64.Build.0 = Debug|x64 20 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Debug|x86.ActiveCfg = Debug|Win32 21 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Debug|x86.Build.0 = Debug|Win32 22 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Release|x64.ActiveCfg = Release|x64 23 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Release|x64.Build.0 = Release|x64 24 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Release|x86.ActiveCfg = Release|Win32 25 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D}.Release|x86.Build.0 = Release|Win32 26 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Debug|x64.ActiveCfg = Debug|x64 27 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Debug|x64.Build.0 = Debug|x64 28 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Debug|x86.ActiveCfg = Debug|Win32 29 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Debug|x86.Build.0 = Debug|Win32 30 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Release|x64.ActiveCfg = Release|x64 31 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Release|x64.Build.0 = Release|x64 32 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Release|x86.ActiveCfg = Release|Win32 33 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD}.Release|x86.Build.0 = Release|Win32 34 | EndGlobalSection 35 | GlobalSection(SolutionProperties) = preSolution 36 | HideSolutionNode = FALSE 37 | EndGlobalSection 38 | GlobalSection(ExtensibilityGlobals) = postSolution 39 | SolutionGuid = {644AC29C-BAD0-4F75-831D-8437E7AE1EC2} 40 | EndGlobalSection 41 | EndGlobal 42 | -------------------------------------------------------------------------------- /Code Cave/Code Cave.vcxproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | Debug 14 | x64 15 | 16 | 17 | Release 18 | x64 19 | 20 | 21 | 22 | 16.0 23 | {B71EF414-9D9D-4FCE-938A-FD83BCB7F26D} 24 | CodeCave 25 | 10.0 26 | 27 | 28 | 29 | Application 30 | true 31 | v142 32 | MultiByte 33 | 34 | 35 | Application 36 | false 37 | v142 38 | true 39 | MultiByte 40 | 41 | 42 | Application 43 | true 44 | v142 45 | Unicode 46 | 47 | 48 | Application 49 | false 50 | v142 51 | true 52 | Unicode 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | true 74 | 75 | 76 | true 77 | 78 | 79 | false 80 | 81 | 82 | false 83 | 84 | 85 | 86 | Level3 87 | true 88 | _DEBUG;_CONSOLE;%(PreprocessorDefinitions) 89 | true 90 | MultiThreadedDLL 91 | 92 | 93 | Console 94 | true 95 | 96 | 97 | 98 | 99 | Level3 100 | true 101 | _DEBUG;_CONSOLE;%(PreprocessorDefinitions) 102 | true 103 | 104 | 105 | Console 106 | true 107 | 108 | 109 | 110 | 111 | Level3 112 | true 113 | true 114 | true 115 | NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 116 | true 117 | MultiThreadedDLL 118 | 119 | 120 | Console 121 | true 122 | true 123 | true 124 | 125 | 126 | 127 | 128 | Level3 129 | true 130 | true 131 | true 132 | NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 133 | true 134 | 135 | 136 | Console 137 | true 138 | true 139 | true 140 | 141 | 142 | 143 | 144 | 145 | 146 | 147 | 148 | 149 | 150 | 151 | -------------------------------------------------------------------------------- /Code Cave/Code Cave.vcxproj.filters: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | {4FC737F1-C7A5-4376-A066-2A32D752A2FF} 6 | cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx 7 | 8 | 9 | {93995380-89BD-4b04-88EB-625FBE52EBFB} 10 | h;hh;hpp;hxx;hm;inl;inc;ipp;xsd 11 | 12 | 13 | {67DA6AB6-F800-4c08-8B7A-83BB121AAD01} 14 | rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms 15 | 16 | 17 | 18 | 19 | Header Files 20 | 21 | 22 | 23 | 24 | Source Files 25 | 26 | 27 | -------------------------------------------------------------------------------- /Code Cave/main.cpp: -------------------------------------------------------------------------------- 1 | #include "main.h" 2 | 3 | PIMAGE_SECTION_HEADER pISH; 4 | 5 | // Converts an RVA to a raw offset 6 | ULONG RvaToOffset(PIMAGE_NT_HEADERS pnth, ULONG Rva) 7 | { 8 | PIMAGE_SECTION_HEADER psh = IMAGE_FIRST_SECTION(pnth); 9 | USHORT NumberOfSections = pnth->FileHeader.NumberOfSections; 10 | 11 | for (int i = 0; i < NumberOfSections; i++) 12 | if (psh[i].VirtualAddress <= Rva && (psh[i].VirtualAddress + psh[i].Misc.VirtualSize) > Rva) 13 | return Rva - psh[i].VirtualAddress + psh[i].PointerToRawData; 14 | 15 | return -1; 16 | } 17 | 18 | // Returns a pointer to MessageBoxA from the Imports 19 | DWORD GetFunctionAddress(PVOID base, LPCSTR name) 20 | { 21 | PIMAGE_DOS_HEADER pIDH = (PIMAGE_DOS_HEADER)base; 22 | PIMAGE_NT_HEADERS pNTH = (PIMAGE_NT_HEADERS)((DWORD)pIDH + pIDH->e_lfanew); 23 | 24 | PIMAGE_IMPORT_DESCRIPTOR pDescriptor = 25 | (PIMAGE_IMPORT_DESCRIPTOR)((char*)base + RvaToOffset(pNTH, pNTH->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)); 26 | 27 | while (pDescriptor->Name) 28 | { 29 | LPCSTR pDllName = (LPCSTR)((char*)base + RvaToOffset(pNTH, pDescriptor->Name)); 30 | HMODULE hDll = LoadLibraryA(pDllName); 31 | 32 | if (hDll) 33 | { 34 | PIMAGE_THUNK_DATA pThunk; 35 | PIMAGE_THUNK_DATA pAddrThunk; 36 | 37 | if (pDescriptor->OriginalFirstThunk) 38 | { 39 | pThunk = (PIMAGE_THUNK_DATA)((char*)base + RvaToOffset(pNTH, pDescriptor->OriginalFirstThunk)); 40 | } 41 | else 42 | { 43 | pThunk = (PIMAGE_THUNK_DATA)((char*)base + RvaToOffset(pNTH, pDescriptor->FirstThunk)); 44 | } 45 | 46 | pAddrThunk = (PIMAGE_THUNK_DATA)((char*)base + RvaToOffset(pNTH, pDescriptor->FirstThunk)); 47 | 48 | PIMAGE_THUNK_DATA pAddrThunk2 = (PIMAGE_THUNK_DATA)((DWORD)pNTH->OptionalHeader.ImageBase + pDescriptor->FirstThunk); 49 | while (pThunk->u1.AddressOfData) 50 | { 51 | PIMAGE_IMPORT_BY_NAME pImport = (PIMAGE_IMPORT_BY_NAME)((char*)base + RvaToOffset(pNTH, pThunk->u1.AddressOfData)); 52 | if (!strcmp(pImport->Name, name)) 53 | { 54 | return (DWORD)pAddrThunk2; 55 | } 56 | 57 | pThunk++; 58 | pAddrThunk++; 59 | pAddrThunk2++; 60 | } 61 | } 62 | 63 | pDescriptor++; 64 | } 65 | 66 | return 0; 67 | } 68 | 69 | // Process relocations 70 | void CreateRelocs(LPVOID lpMapped, uintptr_t functionAddress) 71 | { 72 | PIMAGE_DOS_HEADER pIDH = (PIMAGE_DOS_HEADER)lpMapped; 73 | PIMAGE_NT_HEADERS pNTH = (PIMAGE_NT_HEADERS)((DWORD)pIDH + pIDH->e_lfanew); 74 | PIMAGE_BASE_RELOCATION pRelocTable = 75 | (PIMAGE_BASE_RELOCATION)((char*)lpMapped + RvaToOffset(pNTH, pNTH->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress)); 76 | 77 | uintptr_t pRelocTableLast = (uintptr_t)pRelocTable + pNTH->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size; 78 | 79 | while (pRelocTable->SizeOfBlock) 80 | { 81 | short* pRelocationData = (short*)((char*)pRelocTable + sizeof(IMAGE_BASE_RELOCATION)); 82 | int NumberOfRelocationData = (pRelocTable->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(short); 83 | 84 | PIMAGE_BASE_RELOCATION pNextRelocTable = (PIMAGE_BASE_RELOCATION)((char*)pRelocTable + pRelocTable->SizeOfBlock); 85 | if (pNextRelocTable->VirtualAddress < functionAddress) 86 | { 87 | pRelocTable = (PIMAGE_BASE_RELOCATION)((char*)pRelocTable + pRelocTable->SizeOfBlock); 88 | continue; 89 | } 90 | 91 | short relocToInsert = (IMAGE_REL_BASED_HIGHLOW << 0xC) + functionAddress - pRelocTable->VirtualAddress; // This is the reloc we are injecting 92 | 93 | for (int i = 0; i < NumberOfRelocationData; i++) 94 | { 95 | if (pRelocationData[i] > relocToInsert // Address is bigger 96 | || ((PIMAGE_BASE_RELOCATION)((char*)pRelocTable + pRelocTable->SizeOfBlock) == 0 && (pRelocationData[i] >> 0xC) == IMAGE_REL_BASED_ABSOLUTE)) // Hit the end of the last reloc table 97 | { 98 | /***********Insert Relocation***********/ 99 | uintptr_t source = (uintptr_t)pRelocationData + i * 2; 100 | uintptr_t dest = (uintptr_t)pRelocationData + i * 2 + 2; 101 | SIZE_T length = ((uintptr_t)pRelocTableLast) - source; 102 | 103 | memmove((short*)dest, (short*)source, length); 104 | pRelocationData[i] = relocToInsert; 105 | pRelocTable->SizeOfBlock += 2; 106 | //NumberOfRelocationData++; 107 | 108 | /**************Fix Padding**************/ 109 | 110 | if (pRelocationData[NumberOfRelocationData] >> 0xC == IMAGE_REL_BASED_ABSOLUTE) 111 | { 112 | uintptr_t source2 = (uintptr_t)pRelocationData + NumberOfRelocationData * 2 + 4; 113 | uintptr_t dest2 = (uintptr_t)pRelocationData + NumberOfRelocationData * 2 + 2; 114 | SIZE_T length2 = ((uintptr_t)pRelocTableLast) - source2; 115 | 116 | memmove((short*)dest2, (short*)source2, length2); 117 | pRelocTable->SizeOfBlock -= 2; 118 | } 119 | else 120 | { 121 | uintptr_t source2 = (uintptr_t)pRelocationData + NumberOfRelocationData * 2 + 2; 122 | uintptr_t dest2 = (uintptr_t)pRelocationData + NumberOfRelocationData * 2 + 4; 123 | SIZE_T length2 = ((uintptr_t)pRelocTableLast) - source2; 124 | 125 | memmove((short*)dest2, (short*)source2, length2); 126 | pRelocationData[NumberOfRelocationData + 1] = 0; 127 | pRelocTable->SizeOfBlock += 2; 128 | } 129 | 130 | return; 131 | } 132 | } 133 | } 134 | } 135 | 136 | // Returns an insertion point 137 | int GetInsertionPoint(LPVOID lpMapped, PIMAGE_DOS_HEADER pIDH, PIMAGE_NT_HEADERS pNTH, int& sectionNumber) 138 | { 139 | SIZE_T InsertionPointOffset = 0; 140 | int countZeroes = 0; 141 | 142 | // Loop through each section 143 | for (sectionNumber = 0; sectionNumber < pNTH->FileHeader.NumberOfSections; sectionNumber++) 144 | { 145 | // Loop through each byte in section 146 | for (int j = 0; j < pISH[sectionNumber].SizeOfRawData; j++) 147 | { 148 | // Break if we've reached a large enough size to insert the shellcode 149 | if (sectionNumber != 1 && countZeroes == sizeof(shellcode) + 16 /*To avoid damaging other code, be safe and get a head start of 16 bytes*/) 150 | { 151 | InsertionPointOffset = pISH[sectionNumber].PointerToRawData + j - countZeroes + 16; 152 | printf("Found suitable insertion at point 0x%p, which is in %s\n", InsertionPointOffset, pISH[sectionNumber].Name); 153 | break; 154 | } 155 | // Check if byte is zero 156 | else if (*((LPBYTE)lpMapped + pISH[sectionNumber].PointerToRawData + j) == 0) 157 | { 158 | countZeroes++; 159 | } 160 | // Reset counter if we've reached a non-zero; 161 | else 162 | { 163 | countZeroes = 0; 164 | } 165 | } 166 | 167 | if (InsertionPointOffset) 168 | break; 169 | } 170 | 171 | return InsertionPointOffset; 172 | } 173 | 174 | int main(int argc, char** argv) 175 | { 176 | printf("Opening File: %s\n", argv[1]); 177 | HANDLE hFile = CreateFile(argv[1], FILE_READ_ACCESS | FILE_WRITE_ACCESS, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 178 | if (!hFile) 179 | return -1; 180 | printf("Created handle to file: 0x%X\n", hFile); 181 | 182 | HANDLE hMapping = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL); 183 | if (!hMapping) 184 | return -1; 185 | printf("Created file mapping for: 0x%X\n", hMapping); 186 | 187 | LPVOID lpMapped = MapViewOfFile(hMapping, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0); 188 | if (!lpMapped) 189 | return -1; 190 | printf("Mapped view of file: 0x%X\n", lpMapped); 191 | 192 | PIMAGE_DOS_HEADER pIDH = (PIMAGE_DOS_HEADER)lpMapped; 193 | PIMAGE_NT_HEADERS pNTH = (PIMAGE_NT_HEADERS)((UINT_PTR)pIDH + pIDH->e_lfanew); 194 | pISH = IMAGE_FIRST_SECTION(pNTH); 195 | 196 | int sectionIndex; 197 | int InsertionPointOffset = GetInsertionPoint(lpMapped, pIDH, pNTH, sectionIndex); 198 | if (!InsertionPointOffset) 199 | return -1; 200 | 201 | pISH[sectionIndex].Characteristics |= IMAGE_SCN_MEM_EXECUTE; 202 | printf("Set %s characteristics to IMAGE_SCN_MEM_EXECUTE\n", pISH[sectionIndex].Name); 203 | 204 | uintptr_t functionAddr = GetFunctionAddress(lpMapped, "MessageBoxA"); 205 | if (!functionAddr) 206 | { 207 | printf("The specified API does not exist in the program's IAT!"); 208 | getchar(); 209 | return -1; 210 | } 211 | 212 | *(uintptr_t*)(shellcode + MESSAGEBOXA_OFFSET) = functionAddr; // Add MessageBoxA 213 | uintptr_t rva = pNTH->OptionalHeader.AddressOfEntryPoint - pISH[sectionIndex].VirtualAddress - (InsertionPointOffset - pISH[sectionIndex].PointerToRawData) - (SHELLCODE_JMP_ADR_OFFSET + 4); //JMP to original Entrypoint 214 | *(uintptr_t*)(shellcode + SHELLCODE_JMP_ADR_OFFSET) = rva; 215 | 216 | pNTH->OptionalHeader.AddressOfEntryPoint = InsertionPointOffset + pISH[sectionIndex].VirtualAddress - pISH[sectionIndex].PointerToRawData; 217 | 218 | for (int i = 0; i < sizeof(shellcode); i++) 219 | { 220 | ((LPBYTE)lpMapped + InsertionPointOffset)[i] = shellcode[i]; 221 | } 222 | 223 | if (RvaToOffset(pNTH, pNTH->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress) != -1) 224 | { 225 | printf("File has relocations\n"); 226 | CreateRelocs(lpMapped, (InsertionPointOffset - pISH[sectionIndex].PointerToRawData) + MESSAGEBOXA_OFFSET); 227 | } 228 | 229 | UnmapViewOfFile(lpMapped); 230 | CloseHandle(hMapping); 231 | CloseHandle(hFile); 232 | 233 | printf("Done\n"); 234 | 235 | (void)getchar(); 236 | } -------------------------------------------------------------------------------- /Code Cave/main.h: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #define MESSAGEBOXA_OFFSET 0xA 5 | #define SHELLCODE_JMP_ADR_OFFSET 0x11 6 | 7 | 8 | unsigned char shellcode[32] = { 9 | 0x60, 0x9C, 0x33, 0xC0, 0x50, 0x50, 0x50, 0x50, 0xFF, 0x15, 0xAA, 0xAA, 0xAA, 0xAA, 0x9D, 0x61, 10 | 0xE9, 0xBB, 0xBB, 0xBB, 0xBB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 11 | }; 12 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Code-Cave 2 | It is simple to inject shellcode (position-independent code). However, I have not seen an example where someone injects **position-dependent** code (which requires relocations). This project injects a MessageBox into a code cave (a gap of unusued bytes) in an executable file, and applies relocations to the injected code. 3 | 4 | # Notes 5 | **The file must already have the API (MessageBoxA) in its Import Address Table.** Injecting the import into the IAT of the file may be possible but is incredibly complicated to do. It would require a large amount of adjustments to the other sections and offsets/addresses. At that point, it would be much more logical to write position-independent code. 6 | 7 | # Screenshots 8 | 9 | Demo injection into putty: 10 | 11 | ![](https://i.imgur.com/5gJpsNz.gif) 12 | -------------------------------------------------------------------------------- /Shellcode/Shellcode.vcxproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | Debug 14 | x64 15 | 16 | 17 | Release 18 | x64 19 | 20 | 21 | 22 | 16.0 23 | {E195F177-18C6-4673-A8D1-D38CAF7D2AAD} 24 | Shellcode 25 | 10.0 26 | 27 | 28 | 29 | Application 30 | true 31 | v142 32 | MultiByte 33 | 34 | 35 | Application 36 | false 37 | v142 38 | true 39 | MultiByte 40 | 41 | 42 | Application 43 | true 44 | v142 45 | Unicode 46 | 47 | 48 | Application 49 | false 50 | v142 51 | true 52 | Unicode 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | true 74 | 75 | 76 | true 77 | 78 | 79 | false 80 | 81 | 82 | false 83 | 84 | 85 | 86 | Level3 87 | true 88 | _DEBUG;_CONSOLE;%(PreprocessorDefinitions) 89 | true 90 | MultiThreaded 91 | 92 | 93 | Console 94 | true 95 | 96 | 97 | 98 | 99 | Level3 100 | true 101 | _DEBUG;_CONSOLE;%(PreprocessorDefinitions) 102 | true 103 | 104 | 105 | Console 106 | true 107 | 108 | 109 | 110 | 111 | Level3 112 | true 113 | true 114 | true 115 | NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 116 | true 117 | MultiThreaded 118 | false 119 | MinSpace 120 | 121 | 122 | Windows 123 | true 124 | true 125 | main 126 | 127 | 128 | 129 | 130 | Level3 131 | true 132 | true 133 | true 134 | NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 135 | true 136 | 137 | 138 | Console 139 | true 140 | true 141 | true 142 | 143 | 144 | 145 | 146 | 147 | 148 | 149 | 150 | 151 | 152 | 153 | -------------------------------------------------------------------------------- /Shellcode/Shellcode.vcxproj.filters: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | {4FC737F1-C7A5-4376-A066-2A32D752A2FF} 6 | cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx 7 | 8 | 9 | {93995380-89BD-4b04-88EB-625FBE52EBFB} 10 | h;hh;hpp;hxx;hm;inl;inc;ipp;xsd 11 | 12 | 13 | {67DA6AB6-F800-4c08-8B7A-83BB121AAD01} 14 | rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms 15 | 16 | 17 | 18 | 19 | Header Files 20 | 21 | 22 | 23 | 24 | Source Files 25 | 26 | 27 | -------------------------------------------------------------------------------- /Shellcode/main.c: -------------------------------------------------------------------------------- 1 | #include "main.h" 2 | 3 | _declspec (naked) main() 4 | { 5 | __asm 6 | { 7 | pushad 8 | pushfd 9 | } 10 | 11 | // If you do not mark it as volate, it will put it in the .rdata section, which will create relocs in the shellcode 12 | //volatile char text[] = "Injected!"; 13 | (*(t_MessageBoxA*)(0xAAAAAAAA))(0,0,0,0); 14 | 15 | __asm 16 | { 17 | popfd 18 | popad 19 | _emit 0xE9 __asm _emit 0xBB __asm _emit 0xBB __asm _emit 0xBB __asm _emit 0xBB // jmp to OEP (SHELLCODE_JMP_OFFSET) 20 | } 21 | } -------------------------------------------------------------------------------- /Shellcode/main.h: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | typedef (WINAPI *t_MessageBoxA)( 5 | _In_opt_ HWND hWnd, 6 | _In_opt_ LPCSTR lpText, 7 | _In_opt_ LPCSTR lpCaption, 8 | _In_ UINT uType); 9 | --------------------------------------------------------------------------------