base on A small x64 library to load dll's into memory. # LdrLibraryEx A small x64 library to load dll's into memory. ### Features - low dependencies & function use (only ntdll.dll used) - position independent code - lightweight and minimal - easy to use - load modules from memory - load modules from disk - api sets support - bypass image load callbacks (using private memory) - support for images with delayed import, tls, seh, etc. ### Documentation #### Library Flags Flags can be combined `LIBRARYEX_NONE`: Map module from disk into memory and execute entrypoint. `LIBRARYEX_BYPASS_LOAD_CALLBACK`: Map module from disk into private memory (unbacked) which bypasses image load callbacks (`PsSetLoadImageNotifyRoutine`) `LIBRARYEX_NO_ENTRY`: Do not execute the entrypoint of the module. `LIBRARYEX_BUFFER`: Map the module from memory instead from disk. #### Function: `LdrLibrary` Easy to use function to load a library into memory. The first param, based on what flags has been specified, can be either a wide string module name to load or memory address where the PE is located at. ```c /*! * @brief * load library into memory * * @param Buffer * buffer context to load library * either a wide string or a buffer pointer * the to PE file to map (LIBRARYEX_BUFFER) * * @param Library * loaded library pointer * * @param Flags * flags * * @return * status of function */ NTSTATUS LdrLibrary( _In_ PVOID Buffer, _Out_ PVOID* Library, _In_ ULONG Flags ); ``` This example shows how to load a module from disk (from the System32 path): ```c PVOID Module = { 0 }; ULONG Flags = { 0 }; // // mapping flags to be used by the library // Flags = LIBRARYEX_NONE; // // map file into memory // if ( ! NT_SUCCESS( Status = LdrLibrary( L"advapi32.dll", &Module, Flags ) ) ) { printf( "[-] LdrLibraryEx Failed: %p\n", Status ); return; } printf( "[*] Module @ %p\n", Module ); ``` This examples shows how to load a module from a memory buffer: ```c PVOID Module = { 0 }; ULONG Flags = { 0 }; // // mapping flags to be used by the library // Flags = LIBRARYEX_NONE | LIBRARYEX_BUFFER; // // read file on disk into memory // if ( ! ( Image = ReadFileBuffer( L"C:\\Windows\\System32\\advapi32.dll", NULL ) ) ) { puts( "[-] ReadFileBuffer Failed" ); return; } // // map file into memory // if ( ! NT_SUCCESS( Status = LdrLibrary( Image, &Module, Flags ) ) ) { printf( "[-] LdrLibraryEx Failed: %p\n", Status ); return; } printf( "[*] Module @ %p\n", Module ); ``` It is also possible to load modules based on their api set (win10+ support only): ```c // // map file into memory // if ( ! NT_SUCCESS( Status = LdrLibrary( L"api-ms-win-base-util-l1-1-0.dll", &Module, Flags ) ) ) { printf( "[-] LdrLibraryEx Failed: %p\n", Status ); return; } printf( "[*] Module @ %p\n", ); ``` #### Function: `LdrLibraryEx` LdrLibraryEx allows to hook certain functions to modify the behaviour of how a library should be mapped into memory. ```c // // mapping flags to be used by the library // and insert the loaded module into Peb // Flags = LIBRARYEX_BYPASS_LOAD_CALLBACK | LIBRARYEX_NO_ENTRY; // // init LibraryEx context // if ( ! NT_SUCCESS( Status = LdrLibraryCtx( &Ctx, Flags ) ) ) { printf( "[-] LdrLibraryCtx Failed: %d\n", Status ); goto END; } // // hook function // Ctx.LdrLoadDll = C_PTR( HookLdrLoadDll ); // // map file into memory // if ( ! NT_SUCCESS( Status = LdrLibraryEx( &Ctx, L"cryptsp.dll", &Module, Flags ) ) ) { printf( "[-] LdrLibraryEx Failed: %p\n", Status ); return; } ``` ### Note This codebase is written and optimized for x86_64-mingw and it most likely not going to work and or compile under Visual Studio. ## Credits Huge credit goes out to following resources and projects: - [DarkLoadLibrary](https://github.com/bats3c/DarkLoadLibrary) - [MDSec: Bypassing Image loader kernel callbacks](https://www.mdsec.co.uk/2021/06/bypassing-image-load-kernel-callbacks/) - [ReactOS LdrLoadDll](https://doxygen.reactos.org/d7/d55/ldrapi_8c.html#a7671bda932dbb5096570f431ff83474c) - [Vergilius Project](https://www.vergiliusproject.com/) this project shouldn't be used in a real world env or operation. I mainly wrote this to understand and learn more about how windows loader works. I wrote it as a library because I wanted to use this for other type of public and private projects. I achieved my goal. Cya. ", Assign "at most 3 tags" to the expected json: {"id":"4682","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"