dll injector in csharp

To implement a DLL injector in C#, you can use the following steps:

  1. Start a new C# console application project in Visual Studio.
  2. Add a reference to the System.Diagnostics namespace at the top of your code file.
  3. Create a method that will be responsible for injecting the DLL into the target process. You can name it something like InjectDll.
  4. In the InjectDll method, prompt the user to enter the path of the DLL file they want to inject.
  5. Use the Process class from the System.Diagnostics namespace to start the target process.
  6. Once the process is started, use the ProcessHandle property of the Process object to obtain a handle to the target process.
  7. Use the LoadLibrary function from the kernel32 library to load the DLL into the target process. You can use the DllImport attribute to import this function.
  8. Pass the path of the DLL file as a parameter to the LoadLibrary function.
  9. Finally, close the process handle.

Here's an example implementation of a DLL injector in C#:

main.cs
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace DllInjector
{
    class Program
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern IntPtr OpenProcess(
            int dwDesiredAccess,
            bool bInheritHandle,
            int dwProcessId
        );

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool CloseHandle(IntPtr hObject);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern IntPtr LoadLibrary(string lpFileName);

        static void Main(string[] args)
        {
            InjectDll();
        }

        static void InjectDll()
        {
            Console.WriteLine("Enter the path of the DLL file:");
            string dllPath = Console.ReadLine();

            Console.WriteLine("Enter the process ID of the target process:");
            int processId = int.Parse(Console.ReadLine());

            IntPtr processHandle = OpenProcess(0x001F0FFF, false, processId);

            if (processHandle != IntPtr.Zero)
            {
                IntPtr loadLibraryAddr = LoadLibrary(dllPath);
                if (loadLibraryAddr == IntPtr.Zero)
                {
                    Console.WriteLine("Failed to load DLL into the target process.");
                }
                else
                {
                    Console.WriteLine("DLL injected successfully.");
                }
            }
            else
            {
                Console.WriteLine("Failed to open the target process.");
            }

            CloseHandle(processHandle);
        }
    }
}

1661 chars
58 lines

Please note that DLL injection can be considered a potentially malicious activity, and should only be done for legitimate and authorized purposes.

similar csharp code snippets

add a private property to a class in csharp
add a property to a class in csharp
add a protected property to a class in csharp
add a private static property to a class in csharp
find the last element in an array in csharp
add a public property to a class in csharp
add a public method to a class in csharp
add a protected static property to a class in csharp
add a method to a class in csharp
add an element to the end of an array in csharp

related categories

c#
dll
injection

gistlibby LogSnag