HOOK -- IAT HOOK 本进程MessageBox

下面转自网上的，给读者共享，本来自己写点的，但是一直在讲课，没有时间，姑且先复制粘贴下）

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结合网上资料、使用IAT HOOK截获MessageBox函数、、、

步骤如下

1..写一个自己的MessageBox函数注意调用约定为__stdcall、、

2..定义一MessageBox函数指针如下

     typedef int (__stdcall *pOldMBox)(HWND hWnd, LPCTSTR lpText, LPCTSTR lpCaption,UINT uType);

3..遍历本进程的导入表寻找MessageBox的地址、、

4..修改MessageBox所在THUNK的地址为自己写的函数地址、、代码如下:

 

#include <windows.h>

 

HANDLE pBegin = GetModuleHandle(NULL);

PBYTE  pBegin2 = (PBYTE)pBegin;

 

PIMAGE_DOS_HEADER DOS = PIMAGE_DOS_HEADER(pBegin2);

PIMAGE_NT_HEADERS NT = PIMAGE_NT_HEADERS(pBegin2+DOS->e_lfanew);

PIMAGE_OPTIONAL_HEADER OPTION = &(NT->OptionalHeader);

PIMAGE_IMPORT_DESCRIPTOR IMPORT = PIMAGE_IMPORT_DESCRIPTOR(OPTION->DataDirectory[1].VirtualAddress + pBegin2);

 

typedef int (__stdcall *pOldMBox)(HWND hWnd, LPCTSTR lpText, LPCTSTR lpCaption,UINT uType);

pOldMBox pMBox = NULL;

 

int __stdcall HookMBox(HWND hWnd, LPCTSTR lpText, LPCTSTR lpCaption,UINT uType)

{

       if (NULL == pMBox)

       {

              return MessageBox(hWnd,lpText,lpCaption,uType);

       }

    else

       {

             return pMBox(NULL,"哈哈! IAT  HOOK到了","HOOK",MB_OK);

       }

}

 

int ReAPI(const char* DllName, const char* FunName)

{

       while (IMPORT->Name)

       {

              char* OurDllName = (char*)(IMPORT->Name + pBegin2);

              if (0 == strcmpi(DllName , OurDllName))

              {

                     break;

              }

     IMPORT++;

       }

 

        PIMAGE_IMPORT_BY_NAME  pImportByName = NULL;

       PIMAGE_THUNK_DATA   pOriginalThunk = NULL;

       PIMAGE_THUNK_DATA   pFirstThunk = NULL;

 

       pOriginalThunk = (PIMAGE_THUNK_DATA)(IMPORT->OriginalFirstThunk + pBegin2);

       pFirstThunk = (PIMAGE_THUNK_DATA)(IMPORT->FirstThunk + pBegin2);

 

       while (pOriginalThunk->u1.Function) //记住是Function

       {

              DWORD u1 = pOriginalThunk->u1.Ordinal;  //记住是Ordinal

              if ((u1 & IMAGE_ORDINAL_FLAG) != IMAGE_ORDINAL_FLAG)  //说明MSB不是1  不是以序号导入

              {

                     pImportByName = (PIMAGE_IMPORT_BY_NAME)((DWORD)pOriginalThunk->u1.AddressOfData + pBegin2);

                     char* OurFunName = (char*)(pImportByName->Name); //下边的计算也可以

                     //char* OurFunName2 = (char*)((DWORD)pOriginalThunk->u1.AddressOfData + pBegin2 + 2);

                    if (0 == strcmpi(FunName,OurFunName))

                    {

                      //获取以pFirstThunk开始的内存的信息并将其保存到MEMORY_BASIC_INFORMATION结构中

                      MEMORY_BASIC_INFORMATION mbi_thunk;

                      VirtualQuery(pFirstThunk, &mbi_thunk, sizeof(MEMORY_BASIC_INFORMATION));

                      //VirtualProtect(mbi_thunk.BaseAddress,mbi_thunk.RegionSize, PAGE_READWRITE, &mbi_thunk.Protect);

                      //修改以pFirstThunk开始的内存的的保护属性为PAGE_READWRITE并将原保护属性保存到&dwOLD中

                      DWORD dwOLD;

                       VirtualProtect(pFirstThunk,sizeof(DWORD),PAGE_READWRITE,&dwOLD);

                       //更改真正MessageBoxA的地址为自己写的HookMBox函数的地址、、

                      //将真正的地址付给先前定义的函数指针

                       //结果正确的话就是当本程序调用messagebox的时候程序转去执行咱的HookMBox函数

                      //并且在咱的HookMBox函数中咱还调用了真正的messagebox函数、、

                      pMBox =(pOldMBox)(pFirstThunk->u1.Function);

                      pFirstThunk->u1.Function = (PDWORD)HookMBox;

                      //恢复之前更改的内存的保护属性为人家自己的、、            

                     VirtualProtect(pFirstThunk,sizeof(DWORD),dwOLD,0);

                     break;

              }

              }

              pOriginalThunk++;

              pFirstThunk++;

       }

       

       return 0;

}

int main()

{

  ReAPI("User32.dll","MessageBoxA");

  MessageBox(NULL,"没有HOOK到","HOOK",MB_OK);

}

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