IAT Hooking Internet Explorer

Question

I am trying to use IAT Hooking on Internet Explorer 8 (Not running in protected mode), Windows 7 x64. The code also doesnt work for IE7 on WinXP. I have obtained the pointer to the location at which the address of the function is stored. I am adding a snippet of my code, to make things easy.

typedef int (WINAPI *_MessageBoxW)(HWND,LPCWSTR,LPCWSTR,UINT);
int WINAPI TestMessageBox(HWND,LPCWSTR,LPCWSTR,UINT);

I Obtain the Import Address Table and the address at which the address of MessageBoxW is stored.

PIMAGE_THUNK_DATA pThunk = MakePtr(PIMAGE_THUNK_DATA, hMod, pImportDesc->FirstThunk);

PROC *pLocation=(PROC*)&(pThunk->u1.Function);
_MessageBoxW testVar1=&MessageBoxW;

Here the value of *pLocation is same as testVar1, so i am assuming i got the right address

_MessageBoxW testVar2=&TestMessageBox;

Now i change the permission of the address PROC, using VirtualProtect. After doing this i overwrite it with the new Address.

*pLocation=(PROC)testVar2;

I have verified that the address has been successfully changed, in spite of doing this my function is not getting called. Is there any thing i am missing out? I have pasted the entire code of the injected dll

// injected.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "injected.h"

#ifdef _MANAGED
#pragma managed(push, off)
#endif

BOOL APIENTRY DllMain( HMODULE hModule,DWORD  ul_reason_for_call,LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
    break;
}
return TRUE;
}
#ifdef _MANAGED
#pragma managed(pop)
#endif



extern "C"{

INJECTED_API LRESULT CALLBACK fninjected(int code,WPARAM wParam,LPARAM lParam)
{
    if(gdi32Handle==NULL){
        GetBaseAddressOfModulesLoaded(ModuleBaseAddresses);
        MessageBox(NULL,L"Press ok to Debug",L"Alert!",MB_OK);//Used for Attching Debugger to IE



        PROC* pPROC=(PROC*)GetAddress(ModuleBaseAddresses,"MessageBoxW");
        _MessageBoxW ddd=&MessageBoxW;
        mbOrig=(_MessageBoxW)*pPROC;
        _MessageBoxW mbNew=&AshishMessageBox;
        if(ManipulateAddressPointer(pPROC,(PROC)mbNew)){
        }else{
            MessageBeep(!0x0);
        }

        //////////////////////////////////////////////////////////////////////////

        MessageBoxW(NULL,L"Dummy",L"Heeeeee",MB_OK);
        isProcessed=TRUE;
    }else{
        //A test function Comes Here, to check if the hook has been set or not;
    }
    //MessageBox(NULL,L"Hello World",L"Test",MB_OK);
    return CallNextHookEx(NULL,code,wParam,lParam);
}
}


int GetBaseAddressOfModulesLoaded(std::vector &MBAddressVect){
int count=0;
size_t bytesRead=sizeof(MEMORY_BASIC_INFORMATION);
MEMORY_BASIC_INFORMATION mbi;
HMODULE hModIter;
wchar_t imageName[1024];
hModIter=GetModuleHandle(NULL);
if(hModIter==NULL){
    MessageBox(NULL,L"Failed to get Handle of Current Module",L"Error message",MB_OK);
}else{
    MBAddressVect.push_back(hModIter);
}
for(size_t lpAddress=0;bytesRead==sizeof(MEMORY_BASIC_INFORMATION);lpAddress+=mbi.RegionSize){
    memset(&mbi,0x00,sizeof(MEMORY_BASIC_INFORMATION));
    memset(&imageName,0x00,sizeof(imageName));
    bytesRead=VirtualQuery((LPCVOID)lpAddress,&mbi,sizeof(MEMORY_BASIC_INFORMATION));
    if(mbi.AllocationBase!=mbi.BaseAddress)continue;
    else if(!(mbi.State&MEM_COMMIT))continue;
    if(!mbi.BaseAddress)continue;
    hModIter=(HMODULE)mbi.BaseAddress;

    if(hModIter && GetModuleFileName(hModIter,imageName,1023)>0){

        /*
            Push all the module handles into the vector
        */

        if(!wcsstr(wcslwr(imageName),L"user32.dll")&&!wcsstr(wcslwr(imageName),L"gdi32.dll"))continue;
        else{
            MessageBox(NULL,imageName,L"Loaded DLL",MB_OK);
            gdi32Handle=hModIter;//This is messy
            MBAddressVect.push_back(hModIter);
            count++;
        }
    }
}
return count;
}

void* GetAddress(std::vector  BaseAddresses,char *OrignalFunctionName){
PIMAGE_THUNK_DATA pThunk = NULL, pOrigThunk = NULL;
PIMAGE_IMPORT_BY_NAME pAddressOfData = NULL;

for (std::vector::iterator it = BaseAddresses.begin(); it!=BaseAddresses.end(); ++it) {
    HMODULE hMod=*it;
    PIMAGE_DOS_HEADER pDOSHeader = (PIMAGE_DOS_HEADER)hMod;
    if(pDOSHeader->e_magic!=0x5A4D){
        MessageBox(NULL,L"Not a Valid DOS Image",L"Error",MB_OK);
        return NULL;
    }else{
        //MessageBox(NULL,L"Valid DOS Image",L"Message",MB_OK);
    }
    PIMAGE_NT_HEADERS pNTHeader=MakePtr(PIMAGE_NT_HEADERS,pDOSHeader,pDOSHeader->e_lfanew);
    if(pNTHeader->Signature!=0x00004550){
        MessageBox(NULL,L"Not a Valid NT Image",L"Error",MB_OK);
        return NULL;
    }else{
        //MessageBox(NULL,L"Valid NT Image",L"Error",MB_OK);
    }
    PIMAGE_IMPORT_DESCRIPTOR pImportDesc = MakePtr( PIMAGE_IMPORT_DESCRIPTOR, hMod,pNTHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
    if(!pImportDesc){
        MessageBox(NULL,L"Failed to get Import Descriptors",L"Error",MB_OK);
    }else{
        //MessageBox(NULL,L"Obtained Import Descriptors",L"Success",MB_OK);
    }
    while (pImportDesc->FirstThunk){
        pThunk = MakePtr(PIMAGE_THUNK_DATA, hMod, pImportDesc->FirstThunk); // updated by loader
        pOrigThunk = MakePtr(PIMAGE_THUNK_DATA, hMod, pImportDesc->OriginalFirstThunk); // unmodified by loader

        while (pOrigThunk->u1.Function){
            pAddressOfData = MakePtr(PIMAGE_IMPORT_BY_NAME, hMod, pOrigThunk->u1.AddressOfData);
            if (!IsBadReadPtr(pAddressOfData, sizeof(IMAGE_IMPORT_BY_NAME))) {
                char* funcName=(char*)pAddressOfData->Name;
                if(funcName){
                    if(strstr(funcName,OrignalFunctionName)){
                        MessageBox(NULL,L"Found",L"Success",MB_OK);
                        return(&(pThunk->u1.Function));
                    }
                }
            }
            pThunk++;
            pOrigThunk++;
        }
        pImportDesc++;
    }
}
}
int WINAPI AshishMessageBox(HWND wHandle,LPCWSTR text,LPCWSTR title,UINT type){
return mbOrig(NULL,L"you will always see this",L"No Matter What you try",MB_OK);
}


BOOL AshishExtTextOut(HDC hdc,int X,int Y,UINT fuOptions,const RECT *lprc,LPCWSTR lpString,UINT cbCount,const INT *lpDx){
MessageBox(NULL,lpString,L"Intercepted Text",MB_OK);
return etoOrig(hdc,X,Y,fuOptions,lprc,lpString,cbCount,lpDx);
}


BOOL ManipulateAddressPointer(PROC* pAddress,PROC location){
BOOL rv=FALSE;
if(IsBadWritePtr(pAddress,sizeof(PROC))){
    DWORD oldProtect;
    if(VirtualProtect(pAddress,sizeof(PROC),PAGE_READWRITE,&oldProtect)){
        *pAddress=location;
        DWORD test;
        if(VirtualProtect(pAddress,sizeof(PROC),oldProtect,&test)){
            rv=TRUE;
        }
    }else{
        MessageBox(NULL,L"Fail",L"Error message",MB_OK);
    }
}
else{
    //MessageBox(NULL,L"Memory Is Writable",L"Error message",MB_OK);
    *pAddress=location;
}
return rv;
}

IAT Hooking Internet Explorer

Answers (1)

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