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SharpNeedle

A project for properly injecting C# dlls into other processes.

Note: SharpNeedle currently only supports 32-bit processes. You are welcome to create a pull request which adds 64-bit support.

Rationale

While merely loading your custom dll injected into a target process' memory space is fun, that is only half of the story. Most dll injection tutorials will describe in detail the first half, but then leave you to run your code from within DllMain, a dangerous and limited proposition. For more information about why you should avoid doing anything interesting in your DllMain, read this thread by Raymond Chen.

This project aims to change that dearth of good dll-injection info, providing an open-source way of not only injecting a dll, but also walking the export address table and calling a method on your dll.

This project is specifically geared towards injecting managed code into another process. We will first inject the "Bootstrapper" module, then tell it to load the CLR and start our example managed project.

Usage

Developed in Visual Studio Community 2015 on Windows 10.

In src\Launcher\Launcher.cpp, specify the process name to inject into. In src\ExampleProject\Example.cs, customize EntryPoint() to do as you like. Ensure the process you are injecting into is running. Compile and run with appropriate permission levels. I use an unelevated Visual Studio, then run output from an Administrator command prompt.

Developers

The most interesting file is src\Launcher\Injection.cpp, which deals with walking DLL export tables and creating remote threads.

License

The entirety of my work on this project is released under the 2-clause BSD license.

'src\Launcher\HCommonEnsureCleanup.h' was provided courtesy of GameDeception.net and its license is unclear.