This project is mainly a Go port of metasploit-execute-assembly from @b4rtik.
It starts a notepad.exe process, use reflective DLL injection to inject the .NET CLR hosting DLL, as well as the assembly to run and its arguments.
If you don't trust the DLL, you can build your own version from here. The code will determine the offset for the RefelctiveLoader automatically.
Compile, then run with:
PS> execute-assembly.exe PATH_TO_ASSEMBLY PATH_TO_HOSTING_DLL
The main.go is an exemple, feel free to adapt to your needs.