在另一个没有用.NET编写的进程中调用函数

时间:2014-10-08 19:29:39

标签: c# pinvoke .net-assembly createremotethread

我想在另一个进程中调用一个函数,并通过createremotethread发送超过1个参数。

现在,我可以通过发送内联asm来做到这一点,但我不知道足够的汇编以便这样做。此外,我无权访问远程进程源代码。

我在考虑使用:

[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct RemoteThreadParams
{
    [MarshalAs(UnmanagedType.I4)]
    public int Param1;

    [MarshalAs(UnmanagedType.I4)]
    public int Param2;

}

但据我所知,远程进程必须知道如何处理它。

是否有一种简单的方法可以向远程进程发送超过1个参数但不包含任何程序集?

编辑:

这就是我现在试图解决的问题,但是我的内存异常,我真的不明白我做错了什么。

我们在远程进程中将函数ptr设置为0x64D480,这是从IDA pro获取的程序集。

// FUNCTION PTR IS 0x64D480
.text:0064D480 sub_64D480      proc near               ; CODE XREF: sub_4DA7F0+3Ap
.text:0064D480                                         ; sub_64D550+Bp ...
.text:0064D480
.text:0064D480 var_C           = dword ptr -0Ch // arg1
.text:0064D480 arg_0           = dword ptr  4 // arg2
.text:0064D480
.text:0064D480                 push    esi
.text:0064D481                 push    edi
.text:0064D482                 mov     edi, [esp+8+arg_0]
.text:0064D486                 push    edi
.text:0064D487                 mov     esi, ecx
.text:0064D489                 call    sub_64D330
.text:0064D48E                 test    al, al
.text:0064D490                 jnz     short loc_64D497
.text:0064D492                 pop     edi
.text:0064D493                 pop     esi
.text:0064D494                 retn    4  

不应该以这种方式调用函数:

[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct RemoteThreadParams
{
    [MarshalAs(UnmanagedType.I4)]
    public int Param1;

    [MarshalAs(UnmanagedType.I4)]
    public int Param2;

}  

void CallFunction(IntPtr _functionPtr, RemoteThreadParams _parameters)
{
    // Allocate some native heap memory in your process big enough to store the parameter data
    IntPtr iptrtoparams = Marshal.AllocHGlobal(Marshal.SizeOf(_parameters));

    // Copies the data in your structure into the native heap memory just allocated
    Marshal.StructureToPtr(_parameters, iptrtoparams, false);
    // Use to alloc "committed" memory that is addressable by other process
    IntPtr iptrremoteallocatedmemory = VirtualAllocEx(this.handle, IntPtr.Zero, (uint)Marshal.SizeOf(_parameters), AllocationType.Commit, MemoryProtection.ExecuteReadWrite);
    UIntPtr bytesWritten = UIntPtr.Zero;
    // Copy from local process memory to the memory of the remote process
    WriteProcessMemory(this.handle, iptrremoteallocatedmemory, iptrtoparams, (uint)Marshal.SizeOf(_parameters), out bytesWritten);
    //Free up memory
    Marshal.FreeHGlobal(iptrtoparams);

    //thread id and return value in case we need it for later
    uint iThreadId;
    uint returnValue = 0;

    IntPtr hThread = CreateRemoteThread(this.handle, IntPtr.Zero, 0, _functionPtr, iptrtoparams, 0, out iThreadId);

    WaitForSingleObject(hThread, 0xFFFFFFFF);
    GetExitCodeThread(hThread, out returnValue);

    CloseHandle(hThread);
    CloseHandle(this.handle);
}  

2 个答案:

答案 0 :(得分:1)

我不认为这会有所帮助,但是:

您实际上可以使用例如

来调用本机方法(您可能已经知道)
public static extern Foo (Bar argument);
public void Main()
{
    Foo(new Bar());
}

此外,您实际上可以读取和操作应用程序存储在RAM中的数据 这就是大多数“游戏培训师”所做的事情,这可能会对您有所帮助:http://forum.cheatengine.org/viewtopic.php?t=530207

答案 1 :(得分:1)

没有简单的方法。最简单的方法是使用LoadLibrary和非托管代码执行此操作。您需要两个版本:32位dll和64位dll,您可以根据目标进程“bitness”选择要注入的版本。

CreateRemoteThread(....., Address of LoadLibrary,   "location of your unmanaged dll");

当你google C#CreateRemoteThread LoadLibrary 时,你会在互联网上找到引用。

之后,您需要自定义dll执行函数调用:

#include "stdafx.h"

typedef void (__stdcall *MyCustomFunc)(int param1, int param2);

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        {
            // this code is executed arbitrarily. 
            // this is just a test,
            // you're better off writing a separate function in a DLL
            // and export it, so you can later call it from C#, once DLL is injected.
            MyCustomFunc test = 0x64D480;
            test(2, 4);
        }
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

ps,如果需要,您还需要FreeLibrary。让调用约定正确也很重要。我在这里走出困境,说它看起来像__stdcall,但它可能是__cdecl,或__fastcall,或者其他什么。有关详细信息,请参阅:http://www.codeproject.com/Articles/1388/Calling-Conventions-Demystified