C++基于hook iat改变Messagebox实例

本文实例讲述了C++基于hook iat改变Messagebox的方法，分享给大家供大家参考。具体方法如下：

步骤：

1. 定义原始函数类型的写法

//定义函数原型  

typedef int (WINAPI *PFNMESSAGEBOX)(HWND hWnd,  LPCTSTR lpText,  LPCTSTR lpCaption,  UINT uType);  

//保存原始的MessageBox地址,注意这里  

PROC g_orgProc = (PROC)MessageBox;

2. 先找到dll，找到后设置标志

if (stricmp(pszDllName, "user32.dll") == 0)//如果是user32.dll  

{  

        bFindDll = TRUE;  

        break;  

}

3. 找到dll后，查找函数名称

//在这里是比较的函数名称  

if (stricmp(pszFuncName, "MessageBoxA") == 0)  

{  

 //取得函数地址  

 PDWORD lpAddr = (DWORD*)((BYTE*)hModule + pImportDesc->FirstThunk) + n; //从第一个函数的地址，以后每次+4字节  

 //在这里是比较的函数地址  

 printf("addrss:%X\n", lpAddr);  

 DWORD* lpNewProc = (DWORD*)MyMessageBox;  

 ::WriteProcessMemory(GetCurrentProcess(), lpAddr, &lpNewProc, sizeof(DWORD), NULL);  

 return;  

}

当然 在3.中，也可以根据函数地址比较

#include <windows.h>  

#include <stdio.h>  

  

//定义函数原型  

typedef int (WINAPI *PFNMESSAGEBOX)(HWND hWnd,  LPCTSTR lpText,  LPCTSTR lpCaption,  UINT uType);  

//保存原始的MessageBox地址,注意这里  

PROC g_orgProc = (PROC)MessageBox;  

  

int MyMessageBox(HWND hWnd,  LPCTSTR lpText,  LPCTSTR lpCaption,  UINT uType)  

{  

    return ((PFNMESSAGEBOX)g_orgProc)(hWnd, "mymessagebox", lpCaption, uType);  

}  

  

void SetHook()  

{  

    HMODULE hModule = ::GetModuleHandleA(NULL);  

    IMAGE_DOS_HEADER* pDosHeader = (IMAGE_DOS_HEADER*)hModule;  

    IMAGE_OPTIONAL_HEADER* pOpNtHeader = (IMAGE_OPTIONAL_HEADER*)((BYTE*)hModule + pDosHeader->e_lfanew + 24); //这里加24  

    IMAGE_IMPORT_DESCRIPTOR* pImportDesc = (IMAGE_IMPORT_DESCRIPTOR*)((BYTE*)hModule + pOpNtHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);  

  

    BOOL bFindDll = FALSE;  

    while (pImportDesc->FirstThunk)  

    {  

        char* pszDllName = (char*)((BYTE*)hModule + pImportDesc->Name);  

        printf("模块名称:%s\n", pszDllName);  

          

        if (stricmp(pszDllName, "user32.dll") == 0)//如果是user32.dll  

        {  

            bFindDll = TRUE;  

            break;  

        }  

        pImportDesc++;    

    }  

  

    if (bFindDll)  

    {  

        DWORD n = 0;  

        //一个IMAGE_THUNK_DATA就是一个导入函数  

        IMAGE_THUNK_DATA* pThunk = (IMAGE_THUNK_DATA*)((BYTE*)hModule + pImportDesc->OriginalFirstThunk);  

        while (pThunk->u1.Function)  

        {  

            //取得函数名称  

            char* pszFuncName = (char*)((BYTE*)hModule+pThunk->u1.AddressOfData+2); //函数名前面有两个..  

            printf("function name:%-25s,  ", pszFuncName);  

            //在这里是比较的函数名称  

            if (stricmp(pszFuncName, "MessageBoxA") == 0)  

            {  

                //取得函数地址  

                PDWORD lpAddr = (DWORD*)((BYTE*)hModule + pImportDesc->FirstThunk) + n; //从第一个函数的地址，以后每次+4字节  

                //在这里是比较的函数地址  

                printf("addrss:%X\n", lpAddr);  

                DWORD* lpNewProc = (DWORD*)MyMessageBox;  

                ::WriteProcessMemory(GetCurrentProcess(), lpAddr, &lpNewProc, sizeof(DWORD), NULL);  

                return;  

            }             

            n++; //每次增加一个DWORD  

        }  

        printf("\n");         

    }  

      

}  

int main(int argc, char* argv[])  

{  

    ::MessageBoxA(NULL, "before hook", "", MB_OK);  

    SetHook();  

    ::MessageBoxA(NULL, "AFTERE hook", "", MB_OK);  

    return 0;  

}

下面这个是比较函数地址的版本

#include <windows.h>  

#include <stdio.h>  

  

//定义函数原型  

typedef int (WINAPI *PFNMESSAGEBOX)(HWND hWnd,  LPCTSTR lpText,  LPCTSTR lpCaption,  UINT uType);  

//保存原始的MessageBox地址,注意这里  

PROC g_orgProc = (PROC)MessageBox;  

  

int MyMessageBox(HWND hWnd,  LPCTSTR lpText,  LPCTSTR lpCaption,  UINT uType)  

{  

    return ((PFNMESSAGEBOX)g_orgProc)(hWnd, "mymessagebox", lpCaption, uType);  

}  

  

void SetHook()  

{  

    HMODULE hModule = ::GetModuleHandleA(NULL);  

    IMAGE_DOS_HEADER* pDosHeader = (IMAGE_DOS_HEADER*)hModule;  

    IMAGE_OPTIONAL_HEADER* pOpNtHeader = (IMAGE_OPTIONAL_HEADER*)((BYTE*)hModule + pDosHeader->e_lfanew + 24); //这里加24  

    IMAGE_IMPORT_DESCRIPTOR* pImportDesc = (IMAGE_IMPORT_DESCRIPTOR*)((BYTE*)hModule + pOpNtHeader->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);  

  

    BOOL bFindDll = FALSE;  

    while (pImportDesc->FirstThunk)  

    {  

        char* pszDllName = (char*)((BYTE*)hModule + pImportDesc->Name);  

        printf("模块名称:%s\n", pszDllName);  

          

        if (stricmp(pszDllName, "user32.dll") == 0)//如果是user32.dll  

        {  

            bFindDll = TRUE;  

            break;  

        }  

        pImportDesc++;    

    }  

  

    if (bFindDll)  

    {  

        DWORD n = 0;  

        //一个IMAGE_THUNK_DATA就是一个导入函数  

        IMAGE_THUNK_DATA* pThunk = (IMAGE_THUNK_DATA*)((BYTE*)hModule + pImportDesc->OriginalFirstThunk);  

        while (pThunk->u1.Function)  

        {  

            //取得函数名称  

            char* pszFuncName = (char*)((BYTE*)hModule+pThunk->u1.AddressOfData+2); //函数名前面有两个..  

            printf("function name:%-25s,  ", pszFuncName);  

            //取得函数地址  

            PDWORD lpAddr = (DWORD*)((BYTE*)hModule + pImportDesc->FirstThunk) + n; //从第一个函数的地址，以后每次+4字节  

            printf("addrss:%X\n", lpAddr);  

            //在这里是比较的函数地址  

            if (*lpAddr == (DWORD)g_orgProc)  

            {                                 

                DWORD* lpNewProc = (DWORD*)MyMessageBox;  

                ::WriteProcessMemory(GetCurrentProcess(), lpAddr, &lpNewProc, sizeof(DWORD), NULL);  

                return;  

            }             

            n++; //每次增加一个DWORD  

        }  

        printf("\n");         

    }  

      

}  

int main(int argc, char* argv[])  

{  

    ::MessageBoxA(NULL, "before hook", "", MB_OK);  

    SetHook();  

    ::MessageBoxA(NULL, "AFTERE hook", "", MB_OK);  

    return 0;  

}

附上修改内存页保护属性的代码：

//修改内存页的保护属性  

::VirtualQuery(lpAddr, &mbi, sizeof(MEMORY_BASIC_INFORMATION));  

::VirtualProtect(lpAddr, sizeof(DWORD), PAGE_READWRITE, &dwOldProtect);  

::WriteProcessMemory(GetCurrentProcess(), lpAddr, &lpNewProc, sizeof(DWORD), NULL);  

::VirtualProtect(lpAddr, sizeof(DWORD), dwOldProtect, NULL);

希望本文所述对大家的C++程序设计有所帮助。