Basic Example of Binary Patching With MPatch.exe and APatch.exe

_commands.txt

#Build Your Binaries

c:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe a.cs
c:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe b.cs
c:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe c.cs

# Create Your Patch
# You need Windows 7 SDK 
"C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\mpatch.exe" a.exe b.exe dbi_patch

#Apply Your Patch
#Patch c.exe so it looks like b.exe
"C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\apatch.exe" dbi_patch a.exe c.exe

#Compare
fc b.exe c.exe

a.cs

using System;


public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hello World");
		
	}
}

b.cs

using System;


public class Program
{
	public static void Main()
	{
		Console.WriteLine("Bye World");
		
	}
}

c.cs

using System;


public class Program
{
	public static void Main()
	{
		Console.WriteLine("");
		
	}
}