C# dll注入不加载dll

问题描述 投票：0回答：1

我知道在stackoverflow上有几个类似的问题，但都没有解决我的问题。

所以我正在写一个c#框架，用于低级的进程间操作，包括一个dll注入功能。

在调用我的注入器之前，我已经通过使用 OpenProcess() 与 PROCESS_ALL_ACCESS 以下是我的注入器代码（我知道由于所有的调试打印，可读性受到很大影响）。

public void Inject(string dllName, bool printDebugInfo)
{
    // Check if we are attached to the process.
    target.Assertions.AssertProcessAttached();
    target.Assertions.AssertInjectionPermissions();

    // searching for the address of LoadLibraryA and storing it in a pointer
    IntPtr kernel32Handle = WinAPI.GetModuleHandle("kernel32.dll");
    if (kernel32Handle == IntPtr.Zero)
    {
        uint errorCode = WinAPI.GetLastError();
        throw new Win32Exception((int)errorCode, "Encountered error " + errorCode.ToString() + " (0x" + errorCode.ToString("x") + ") - FATAL: Could not get handle of kernel32.dll: was NULL.");
    }
    UIntPtr loadLibraryAddr = WinAPI.GetProcAddress(kernel32Handle, "LoadLibraryA");
    if (loadLibraryAddr == UIntPtr.Zero)
    {
        uint errorCode = WinAPI.GetLastError();
        throw new Win32Exception((int)errorCode, "Encountered error " + errorCode.ToString() + " (0x" + errorCode.ToString("x") + ") - FATAL: Could not get address of LoadLibraryA: was NULL.");
    }
    HelperMethods.Debug("LoadLibraryA is at 0x" + loadLibraryAddr.ToUInt64().ToString("x"), printDebugInfo);

    // alocating some memory on the target process - enough to store the name of the dll
    // and storing its address in a pointer
    uint size = (uint)((dllName.Length + 1) * Marshal.SizeOf(typeof(char)));
    IntPtr allocMemAddress = WinAPI.VirtualAllocEx(target.Handle, IntPtr.Zero, size, (uint)Permissions.MemoryPermission.MEM_COMMIT | (uint)Permissions.MemoryPermission.MEM_RESERVE, (uint)Permissions.MemoryPermission.PAGE_READWRITE);
    HelperMethods.Debug("Allocated memory at 0x" + allocMemAddress.ToInt64().ToString("x"), printDebugInfo);

    int bytesWritten = 0;
    // writing the name of the dll there
    byte[] buffer = new byte[size];
    byte[] bytes = Encoding.ASCII.GetBytes(dllName);
    Array.Copy(bytes, 0, buffer, 0, bytes.Length);
    buffer[buffer.Length - 1] = 0;
    bool success = WinAPI.WriteProcessMemory((uint)target.Handle, allocMemAddress.ToInt64(), buffer, size, ref bytesWritten);
    if (success)
    {
        HelperMethods.Debug("Successfully wrote \"" + dllName + "\" to 0x" + allocMemAddress.ToInt64().ToString("x"), printDebugInfo);
    }
    else
    {
        HelperMethods.Debug("FAILED to write dll name!", printDebugInfo);
    }
    // creating a thread that will call LoadLibraryA with allocMemAddress as argument
    HelperMethods.Debug("Injecting dll ...", printDebugInfo);
    IntPtr threadHandle = WinAPI.CreateRemoteThread(target.Handle, IntPtr.Zero, 0, loadLibraryAddr, allocMemAddress, 0, out IntPtr threadId);
    HelperMethods.Debug("CreateRemoteThread returned the following handle: 0x" + threadHandle.ToInt32().ToString("x"), printDebugInfo);
    uint errCode = WinAPI.GetLastError();
    if (threadHandle == IntPtr.Zero)
    {
        throw new Win32Exception((int)errCode, "Encountered error " + errCode.ToString() + " (0x" + errCode.ToString("x") + ") - FATAL: CreateRemoteThread returned NULL pointer as handle.");
    }
    Console.WriteLine("CreateRemoteThread threw errorCode 0x" + errCode.ToString("x"));
    Console.WriteLine("Currently the following modules are LOADED:");
    ProcessModuleCollection processModules = target.Process.Modules;
    foreach (ProcessModule module in processModules)
    {
        Console.WriteLine("  - " + module.FileName);
    }
    uint waitExitCode = WinAPI.WaitForSingleObject(threadHandle, 10 * 1000);
    HelperMethods.Debug("Waiting for thread to exit ...", printDebugInfo);
    HelperMethods.Debug("WaitForSingleObject returned 0x" + waitExitCode.ToString("x"), printDebugInfo);
    Thread.Sleep(1000);
    Console.WriteLine("Currently the following modules are LOADED:");
    processModules = target.Process.Modules;
    foreach (ProcessModule module in processModules)
    {
        Console.WriteLine("  - " + module.FileName);
    }
    success = WinAPI.GetExitCodeThread(threadHandle, out uint exitCode);
    if (!success)
    {
        uint errorCode = WinAPI.GetLastError();
        throw new Win32Exception((int)errorCode, "Encountered error " + errorCode.ToString() + " (0x" + errorCode.ToString("x") + ") - FATAL: Non-zero exit code of GetExitCodeThread.");
    }
    Console.WriteLine("Currently the following modules are LOADED:");
    processModules = target.Process.Modules;
    foreach (ProcessModule module in processModules)
    {
        Console.WriteLine("  - " + module.FileName);
    }
    HelperMethods.Debug("Remote thread returned 0x" + exitCode.ToString("x"), printDebugInfo);
    success = WinAPI.CloseHandle(threadHandle);
    if (!success)
    {
        uint errorCode = WinAPI.GetLastError();
        throw new Win32Exception((int)errorCode, "Encountered error " + errorCode.ToString() + " (0x" + errorCode.ToString("x") + ") - FATAL: Failed calling CloseHandle on 0x" + threadHandle.ToInt64().ToString("x") + ".");
    }
    HelperMethods.Debug("Called CloseHandle on 0x" + threadHandle.ToInt64().ToString("x") + ".", printDebugInfo);
    success = WinAPI.VirtualFreeEx(target.Handle, allocMemAddress, 0, 0x8000);
    if (!success)
    {
        uint errorCode = WinAPI.GetLastError();
        throw new Win32Exception((int)errorCode, "Encountered error " + errorCode.ToString() + " (0x" + errorCode.ToString("x") + ") - FATAL: Failed calling VirtualFreeEx on 0x" + allocMemAddress.ToInt64().ToString("x") + ".");
    }
    HelperMethods.Debug("Released all previously allocated resources!", printDebugInfo);
}

所有的WinAPI函数都是按照微软官方文档的规定被调用的(三番五次的检查)。

我调用我的代码如下

Target target = Target.CreateFromName("notepad++");
target.Attach(Permissions.ProcessPermission.PROCESS_ALL_ACCESS);
target.Injector.Inject(@"L:\Programming\C\test\newdll.dll",true);

的完整源代码。Target 课堂上 GitHub 但应该与这个问题无关。

这里最有趣的可能是 newdll.dll 用原生C语言编写，如下所示。

#include<Windows.h>
#include<stdbool.h>
__declspec(dllexport) bool WINAPI DllMain(HINSTANCE hInstDll, DWORD fdwReason, LPVOID lpvReserved)
{
    switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
        {
            break;
        }

        case DLL_PROCESS_DETACH:
        {
            break;
        }

        case DLL_THREAD_ATTACH:
        {
            break;
        }

        case DLL_THREAD_DETACH:
        {
            break;
        }
    }
    return true;
}

这段代码显然没有什么作用 但由于从DllMain中产生类似于Messagebox的东西显然被认为是 "坏事"，所以我就把它留在了这里。然而，如果注入是有效的，那么这个dll就会被列在 Process.Modules (它不是)。

然而，当运行我的代码时，我从所有的调试打印中得到以下输出。

LoadLibraryA is at 0x778f60b0
Allocated memory at 0x9c0000
Successfully wrote "L:\Programming\C\test\newdll.dll" to 0x9c0000
Injecting dll ...
CreateRemoteThread returned the following handle: 0x22c
CreateRemoteThread threw errorCode 0x0
Currently the following modules are LOADED:
  - J:\TOOLS\Notepad++\notepad++.exe
  - C:\Windows\SYSTEM32\ntdll.dll
  - C:\Windows\SYSTEM32\wow64.dll
  - C:\Windows\SYSTEM32\wow64win.dll
  - C:\Windows\SYSTEM32\wow64cpu.dll
Waiting for thread to exit ...
WaitForSingleObject returned 0x0
Currently the following modules are LOADED:
  - J:\TOOLS\Notepad++\notepad++.exe
  - C:\Windows\SYSTEM32\ntdll.dll
  - C:\Windows\SYSTEM32\wow64.dll
  - C:\Windows\SYSTEM32\wow64win.dll
  - C:\Windows\SYSTEM32\wow64cpu.dll
Currently the following modules are LOADED:
  - J:\TOOLS\Notepad++\notepad++.exe
  - C:\Windows\SYSTEM32\ntdll.dll
  - C:\Windows\SYSTEM32\wow64.dll
  - C:\Windows\SYSTEM32\wow64win.dll
  - C:\Windows\SYSTEM32\wow64cpu.dll
Remote thread returned 0x0
Called CloseHandle on 0x22c.
Released all previously allocated resources!
Press any key to continue . . .

可以看到，没有任何错误代码，也没有任何迹象表明 注入出了问题，除了... ... newdll.dll 从来没有被加载，因为它没有显示在加载模块中的 Process.Modules.

那么我的代码有什么问题呢？

快速概述一下。我的确是按照以下程序来做的

  • OpenProcess() 与 PROCESS_ALL_ACCESS
  • GetModuleHandle("kernel32.dll")
  • GetProcAddress(kernel32Handle, "LoadLibraryA")
  • VirtualAllocEx(...) 和 WriteProcessMemory() 写下我的dll名称和路径。
  • CreateRemoteThread() 加载dll
  • WaitForSingleObject() 等待加载dll
  • 释放之前分配的所有资源
c# c .net dll dll-injection
1个回答
0
投票

正如正确指出的那样，这种注入技术只有在从32位进程-->32位进程或从64位进程-->64位进程注入时才有效。我将我的代码编译成64位可执行文件，试图将我的dll注入到32位的notepad++.exe中。

另外，我还必须调整 WriteProcessMemory 调用，以符合32位内存空间的要求。所以从 bool success = WinAPI.WriteProcessMemory((uint)target.Handle, allocMemAddress.ToInt64(), buffer, size, ref bytesWritten); 到 bool success = WinAPI.WriteProcessMemory((uint)target.Handle, allocMemAddress.ToInt32(), buffer, size, ref bytesWritten); 做到了这一点。

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