Mono

This may not be news for everyone but I find it interesting. Mono.Cecil is a impressive work and can provide a lot of cool features such as runtime .NET assembly manipulation. We can inject opcodes (IL instructions) into a target assembly, transforming it as we wish. Here’s the test scenario:

A dummy C# application like the one below, compile it to get it’s executable file, that’s what we need (https://github.com/guitmz/msil-cecil-injection).

using System;

namespace Dummy
{
	class Program
	{
		public static void Main(string[] args)
		{
			Console.WriteLine("DUMMY APP HERE YO!");
			Console.ReadLine();
		}
	}
}

We also have this other application which will be our injector. You’ll need to download the Mono.Cecil DLL file and add it as reference in the injector project.