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Old 06-19-2022, 23:59
mcr4ck mcr4ck is offline
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Loader and Patch Dll file in C#

hi

Loader in C#
A project in C# language
that you can patch in this program with this DLL file


Code:
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        [DllImport("kernel32.dll")]
        static extern IntPtr OpenThread(ThreadAccess dwDesiredAccess, bool bInheritHandle, uint dwThreadId);
        [DllImport("kernel32.dll")]
        static extern uint SuspendThread(IntPtr hThread);
        [DllImport("kernel32.dll")]
        static extern int ResumeThread(IntPtr hThread);
        [DllImport("kernel32", CharSet = CharSet.Auto, SetLastError = true)]
        static extern bool CloseHandle(IntPtr handle);
        //

        [DllImport("kernel32.dll")]
        static extern IntPtr OpenProcess(UInt32 dwDesiredAccess, Boolean bInheritHandle, UInt32 dwProcessId);
        [DllImport("kernel32.dll")]
        static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress,
        byte[] lpBuffer, UIntPtr nSize, uint lpNumberOfBytesWritten);

        [DllImport("kernel32.dll")]
        static extern bool VirtualProtectEx(IntPtr hProcess, IntPtr lpAddress,
           UIntPtr dwSize, uint flNewProtect, out uint lpflOldProtect);

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

        static IntPtr Handle;
        static IntPtr baseadd;
        const int MEM_COMMIT = 0x00001000;
        const int PAGE_READWRITE = 0x04;
        const int PROCESS_WM_READ = 0x0010;
        const int PAGE_EXECUTE_READ = 0x20;
        const int PAGE_READONLY = 0x02;
        const int PAGE_EXECUTE_READWRITE = 0x40;

        public enum ThreadAccess : int
        {
            TERMINATE = (0x0001),
            SUSPEND_RESUME = (0x0002),
            GET_CONTEXT = (0x0008),
            SET_CONTEXT = (0x0010),
            SET_INFORMATION = (0x0020),
            QUERY_INFORMATION = (0x0040),
            SET_THREAD_TOKEN = (0x0080),
            IMPERSONATE = (0x0100),
            DIRECT_IMPERSONATION = (0x0200)
        }


        [DllImport("kernel32.dll")]
        public static extern bool ReadProcessMemory(IntPtr hProcess, Int64 lpBaseAddress, [Out] byte[] lpBuffer, int dwSize, out  IntPtr lpNumberOfBytesRead);
        //
        private static void SuspendProcess(int pid)
        {
            var process = Process.GetProcessById(pid);

            if (process.ProcessName == string.Empty)
                return;

            foreach (ProcessThread pT in process.Threads)
            {
                IntPtr pOpenThread = OpenThread(ThreadAccess.SUSPEND_RESUME, false, (uint)pT.Id);

                if (pOpenThread == IntPtr.Zero)
                {
                    continue;
                }

                SuspendThread(pOpenThread);

                CloseHandle(pOpenThread);
            }
        }
        //
        public static void ResumeProcess(int pid)
        {
            var process = Process.GetProcessById(pid);

            if (process.ProcessName == string.Empty)
                return;

            foreach (ProcessThread pT in process.Threads)
            {
                IntPtr pOpenThread = OpenThread(ThreadAccess.SUSPEND_RESUME, false, (uint)pT.Id);

                if (pOpenThread == IntPtr.Zero)
                {
                    continue;
                }

                var suspendCount = 0;
                do
                {
                    suspendCount = ResumeThread(pOpenThread);
                } while (suspendCount > 0);

                CloseHandle(pOpenThread);
            }
        }

        //
    static    Process prc;
   static bool v;
  static int b;
        static void Main(string[] args)
        {
            try
            {
                //
                string startupPath = @"C:\Test.exe";
                   
                using (Process myProcess = new Process())
                {
                     ProcessStartInfo myProcessStartInfo = new ProcessStartInfo(startupPath);
                   
                    myProcess.StartInfo = myProcessStartInfo;
                   
                    myProcess.Start();
                main1:
                    Thread.Sleep(1300);
					//SuspendProcess for Change byte
                    SuspendProcess(myProcess.Id);
                   

                        ProcessModule myProcessModule;
                        // Get all the modules associated with 'myProcess'.
                        ProcessModuleCollection myProcessModuleCollection = myProcess.Modules;
                        for (int i = 0; i < myProcessModuleCollection.Count; i++)
                        {
                            
                            myProcessModule = myProcessModuleCollection[i];
                            if (myProcessModule.ModuleName == "test.dll")
                            {
                                Console.WriteLine(myProcessModule.ModuleName);
                            }
                            
                        
                        }
						//time deley
						//you change
                        b += 20;
                        ResumeProcess(myProcess.Id);
                        Thread.Sleep(b);
                        SuspendProcess(myProcess.Id);
                        int m = 0;


                        goto main1;
                   
                }

                    //byte orginal

                string hex_to_find = "2DE1630000";
                byte[] hexfbytes = ConvertHexStringToByteArray(hex_to_find);
				//byte Changed
                string hex_replacewith = "83E8009090";  // just return true in ilcode
                byte[] hexreplacebytes = ConvertHexStringToByteArray(hex_replacewith);
                //
       
              
           
            //  
              //prc.WaitForInputIdle();
                Handle = prc.Handle;
               pat:
              
               foreach (ProcessModule module in prc.Modules)
               {


                   //dll moduls

                   if (string.Compare(module.ModuleName, "test.dll", true) == 0)
                   {
                      
                       baseadd = module.BaseAddress + 0x1000;
                       IntPtr bytesRead;

                       byte[] buffer = new byte[module.ModuleMemorySize];
                       ReadProcessMemory((IntPtr)Handle, (Int64)baseadd, buffer, buffer.Length, out bytesRead);
                       //
                       for (int i = 0; i < (int)module.ModuleMemorySize; i++)
                       {
                           if (buffer[i + 0] == hexfbytes[0])  // first time check only one byte!
                           {
                               bool isfinded = true;
                               for (int j = 0; j < hexfbytes.Length; j++)
                               {

                                   if ((i + j) >= buffer.Length || buffer[i + j] != hexfbytes[j])
                                   {
                                       isfinded = false;
                                       break;
                                   }

                               }

                               if (isfinded)
                               {  // if finded patch the memory:
                                   IntPtr lpAddressWhereToPatch = (IntPtr)((long)baseadd + (long)i);
                                   IntPtr numberofbyteswritten = IntPtr.Zero;
                                   bool is_write_ok = WriteProcessMemory(Handle, lpAddressWhereToPatch,
                                                                         hexreplacebytes, hexreplacebytes.Length,
                                                                         out numberofbyteswritten);
                                  
                                   v = true;
                                  
                                   break;

                               }

                           }




                       }
                   }
               }
               if (v ==false)
               {
               pat1:
                  
                   ResumeProcess(prc.Id);
                
                   SuspendProcess(prc.Id);
                   goto pat;

                   goto pat1;
                   ResumeProcess(prc.Id);
               }
               ResumeProcess(prc.Id);
            }
            catch (Exception ex)
            {
                ResumeProcess(prc.Id);
                prc.Close();
                
            }
        }

        public static byte[] ConvertHexStringToByteArray(string hexString)
        {
            if (hexString.Length % 2 != 0)
            {
                throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, "The binary key cannot have an odd number of digits: {0}", hexString));
            }

            byte[] HexAsBytes = new byte[hexString.Length / 2];
            for (int index = 0; index < HexAsBytes.Length; index++)
            {
                string byteValue = hexString.Substring(index * 2, 2);
                HexAsBytes[index] = byte.Parse(byteValue, NumberStyles.HexNumber, CultureInfo.InvariantCulture);
            }

            return HexAsBytes;
        }
    }
}
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