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샘플 코드

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;

public class Test {
    [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 bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, int dwSize, ref int lpNumberOfBytesRead);
    [DllImport("kernel32.dll")]
    static extern IntPtr CreateRemoteThread(IntPtr hProcess, IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId);
    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;
    const uint MEM_COMMIT = 0x00001000;
    const uint MEM_RESERVE = 0x00002000;
    const uint PAGE_READWRITE = 4;
    public static int Main() {
        Console.WriteLine("1 Get process by name...");
        Process targetProcess = Process.GetProcessesByName("notepad")[0];
        Console.WriteLine("  Found procId: " + targetProcess.Id);
        Console.WriteLine("2 Getting handle to process...");
        IntPtr procHandle = OpenProcess(PROCESS_CREATE_THREAD | PROCESS_QUERY_INFORMATION | PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ, false, targetProcess.Id);
        Console.WriteLine("  Got procHandle: " + procHandle);
        Console.WriteLine("3 Getting loadlibrary pointer...");
        IntPtr loadLibraryAddr = GetProcAddress(GetModuleHandle("kernel32.dll"), "LoadLibraryA");
        Console.WriteLine("  Loadlibrary pointer: " + loadLibraryAddr);
        string dllName = "C:\\ore\\c\\spy.dll";
        Console.WriteLine("4 Allocating memory...");
        IntPtr allocMemAddress = VirtualAllocEx(procHandle, IntPtr.Zero, (uint) ((dllName.Length + 1) * Marshal.SizeOf(typeof(char))), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
        Console.WriteLine("  allocMemAddress: " + allocMemAddress);
        Console.WriteLine("5 Writing content to memory...");
        UIntPtr bytesWritten;
        bool resp1 = WriteProcessMemory(procHandle, allocMemAddress, Encoding.Default.GetBytes(dllName), (uint)((dllName.Length + 1) * Marshal.SizeOf(typeof(char))), out bytesWritten);
        int bytesRead = 0;
        byte[] buffer = new byte[24];
        Console.WriteLine("6 Reading content from memory...");
        ReadProcessMemory(procHandle, allocMemAddress, buffer, buffer.Length, ref bytesRead);
        Console.WriteLine("  Data in memory: " + System.Text.Encoding.UTF8.GetString(buffer));
        Console.WriteLine("7 CreateRemoteThread");
        CreateRemoteThread(procHandle, IntPtr.Zero, 0, loadLibraryAddr, allocMemAddress, 0, IntPtr.Zero);
        return 0;
    }
}