C#中的DLL注入 （转）

事实上dll注入很简单，无非就是调用virtualAllocEx,WriteProcessMemory,OpenProcess,CreateRemoteThread等API函数，因为我是学c#的，所以也想看一下c#这方面的文章，但在网上找了半天，没有找到一篇，也许是c#刚兴起的缘故，学c#的并不多，没办法，只好自己移植一下，因为凡是用到API函数，所有的编程的语言都是相同的，这就为我们的移植带来了方便，学c#的一般应该对API的调用概念很淡，因为c#通常不会去调用API函数，因为这些已经被封装了，在vb,vc++等语言中要结束一个进程，首先就必须要得到这个进程的句柄，然后才能进行相应的关闭进程等操作，得到句柄要用到OpenProcess API函数，结束进程要用到TerminateProcess API函数，但是在c#中你根本不需要知道这些API函数就能完成同样的功能，所以你要是想了解一下API的相关知识，学一点vb是一个很好的选择。好了！下面就开始我们的c# dll注入之旅吧！
首先需要加入以下API函数：
  [DllImport("kernel32.dll")]
          public static extern int VirtualAllocEx(IntPtr hwnd, int lpaddress, int size, int type, int tect);
          [DllImport("kernel32.dll")]
          public static extern int WriteProcessMemory(IntPtr hwnd, int baseaddress, string buffer, int nsize, int filewriten );
          [DllImport("kernel32.dll")]
          public static extern int GetProcAddress(int hwnd, string lpname);
          [DllImport("kernel32.dll")]
          public static extern int GetModuleHandleA(string name);
          [DllImport("kernel32.dll")]
          public static extern int CreateRemoteThread(IntPtr hwnd, int attrib, int size, int address, int par, int flags, int threadid);
   


C#声明API比较复杂，因为是调用非托管的dll，所以要用到DllImport来调用非托管的dll,他还有很多属性在这就不多说了，网上有很介绍，可以去查一下，不过c#调用自身的变得动态链接库是倒是很方便，直接加个引用就ok了，调用dll要用的一个引用：using System.Runtime.InteropServices;这个不要忘了加上，下面是编好的所有代码：
  using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Text;
  using System.Windows.Forms;
  using System.Runtime.InteropServices;
  using System.Diagnostics;
  namespace dllinject
  {
      public partial class Form1 : Form
      {
          [DllImport("kernel32.dll")] //声明API函数
          public static extern int VirtualAllocEx(IntPtr hwnd, int lpaddress, int size, int type, int tect);
          [DllImport("kernel32.dll")]
          public static extern int WriteProcessMemory(IntPtr hwnd, int baseaddress, string buffer, int nsize, int filewriten );
          [DllImport("kernel32.dll")]
          public static extern int GetProcAddress(int hwnd, string lpname);
          [DllImport("kernel32.dll")]
          public static extern int GetModuleHandleA(string name);
          [DllImport("kernel32.dll")]
          public static extern int CreateRemoteThread(IntPtr hwnd, int attrib, int size, int address, int par, int flags, int threadid);
          public Form1()
          {
              InitializeComponent();
          }
   
          private void button1_Click(object sender, EventArgs e)
          {
              int ok1;
              //int ok2;
              //int hwnd;
              int baseaddress;
              int temp=0;
              int hack;
              int yan;
              string dllname;
              dllname = "c:\\dll.dll";
              int dlllength;
              dlllength = dllname.Length + 1;
              Process[] pname = Process.GetProcesses(); //取得所有进程
              foreach (Process name in pname) //遍历进程
              {
                  //MessageBox.Show(name.ProcessName.ToLower());
                  if (name.ProcessName.ToLower().IndexOf("notepad") != -1) //所示记事本，那么下面开始注入
                  {
                     
                      baseaddress = VirtualAllocEx(name.Handle, 0, dlllength , 4096, 4);  //申请内存空间
                      if (baseaddress == 0) //返回0则操作失败，下面都是
                      {
                          MessageBox.Show("申请内存空间失败！！");
                          Application.Exit();
                      }
                      ok1 = WriteProcessMemory(name.Handle, baseaddress, dllname, dlllength, temp); //写内存
                      if (ok1 == 0)
                      {
                         
                              MessageBox.Show("写内存失败！！");
                              Application.Exit();
                        }
                        hack = GetProcAddress(GetModuleHandleA("Kernel32"), "LoadLibraryA"); //取得loadlibarary在kernek32.dll地址
                        if (hack == 0)
                        {
                            MessageBox.Show("无法取得函数的入口点！！");
                            Application.Exit();
                        }
                        yan = CreateRemoteThread(name.Handle, 0, 0, hack, baseaddress, 0, temp); //创建远程线程。
                        if (yan == 0)
                        {
                            MessageBox.Show("创建远程线程失败！！");
                            Application.Exit();
                        }
                        else
                        {
                            MessageBox.Show("已成功注入dll!!");
                        }
   
                  }
   
              }
   
          }
      }