Exemplo n.º 1
0
	NTSTATUS MExcept::CreateVEH(size_t pTargetBase, size_t imageSize, eModType mt, bool partial) {
		AsmJitHelper a;
		uint64_t result = 0;
		auto& mods = _proc.Modules();
		#ifdef USE64 
		// Add module to module table
		if(!_pModTable.Valid()) {
			_pModTable = _proc.Memory().Allocate(0x1000);
			_pModTable.Release();
			if(!_pModTable.Valid())
				return LastNtStatus();
		}
		ModuleTable table;
		_pModTable.Read(0, table);
		// Add new entry to the table
		table.entry[table.count].base = pTargetBase;
		table.entry[table.count].size = imageSize;
		table.count++;
		_pModTable.Write(0, table);
		// No handler required
		if(partial)
			return STATUS_SUCCESS;
		// VEH codecave
		_pVEHCode = _proc.Memory().Allocate(0x2000);
		_pVEHCode.Release();
		if(!_pVEHCode.Valid())
			return LastNtStatus();
		BLACBONE_TRACE("ManualMap: Vectored hander: 0x%p\n", _pVEHCode.Ptr());
		asmjit::Label lExit = a->newLabel();
		asmjit::Label lLoop1 = a->newLabel();
		asmjit::Label skip1 = a->newLabel();
		asmjit::Label found1 = a->newLabel();
		//
		// Assembly code for VectoredHandler64
		// 0x10 - EXCEPTION_RECORD.ExceptionAddress
		// 0x20 - EXCEPTION_RECORD.ExceptionInformation[0]
		// 0x30 - EXCEPTION_RECORD.ExceptionInformation[2]
		// 0x38 - EXCEPTION_RECORD.ExceptionInformation[3]
		//
		a->mov(asmjit::host::rax, asmjit::host::qword_ptr(asmjit::host::rcx));
		a->cmp(asmjit::host::dword_ptr(asmjit::host::rax), EH_EXCEPTION_NUMBER);            // Exception code
		a->jne(lExit);
		a->cmp(asmjit::host::qword_ptr(asmjit::host::rax, 0x20), EH_PURE_MAGIC_NUMBER1);    // Sub code
		a->jne(lExit);
		a->cmp(asmjit::host::qword_ptr(asmjit::host::rax, 0x38), 0);                        // Image base
		a->jne(lExit);
		a->mov(asmjit::host::r9, _pModTable.Ptr());
		a->mov(asmjit::host::rdx, asmjit::host::qword_ptr(asmjit::host::r9));               // Record count
		a->add(asmjit::host::r9, sizeof(table.count));
		a->xor_(asmjit::host::r10, asmjit::host::r10);
		a->bind(lLoop1);
		a->mov(asmjit::host::r8, asmjit::host::qword_ptr(asmjit::host::rax, 0x30));
		a->mov(asmjit::host::r11, asmjit::host::qword_ptr(asmjit::host::r9));
		a->cmp(asmjit::host::r8, asmjit::host::r11);
		a->jl(skip1);
		a->add(asmjit::host::r11, asmjit::host::qword_ptr(asmjit::host::r9, sizeof(table.entry[0].base)));    // Size
		a->cmp(asmjit::host::r8, asmjit::host::r11);
		a->jg(skip1);
		a->jmp(found1);
		a->bind(skip1);
		a->add(asmjit::host::r9, sizeof(ExceptionModule));
		a->add(asmjit::host::r10, 1);
		a->cmp(asmjit::host::r10, asmjit::host::rdx);
		a->jne(lLoop1);
		a->jmp(lExit);
		a->bind(found1);
		a->mov(asmjit::host::qword_ptr(asmjit::host::rax, 0x20), EH_MAGIC_NUMBER1);
		a->mov(asmjit::host::rcx, asmjit::host::qword_ptr(asmjit::host::rcx));
		a->mov(asmjit::host::rdx, asmjit::host::qword_ptr(asmjit::host::r9));
		a->mov(asmjit::host::qword_ptr(asmjit::host::rax, 0x38), asmjit::host::rdx);
		a->bind(lExit);
		a->xor_(asmjit::host::rax, asmjit::host::rax);
		a->ret();
		a->db(0xCC);
		a->db(0xCC);
		a->db(0xCC);
		if(_pVEHCode.Write(0, a->getCodeSize(), a->make()) != STATUS_SUCCESS) {
			_pVEHCode.Free();
			return LastNtStatus();
		}
		#else
		UNREFERENCED_PARAMETER(pTargetBase);
		UNREFERENCED_PARAMETER(imageSize);
		// No handler required
		if(partial)
			return STATUS_SUCCESS;
		// VEH codecave
		_pVEHCode = _proc.Memory().Allocate(0x2000);
		_pVEHCode.Release();
		if(!_pVEHCode.Valid())
			return LastNtStatus();
		// Resolve compiler incremental table address, if any
		void *pFunc = ResolveJmp(&VectoredHandler);
		size_t fnSize = static_cast<size_t>(SizeOfProc(pFunc));
		size_t dataOfs = 0, code_ofs = 0, code_ofs2 = 0;;
		// Find and replace magic values
		for(uint8_t *pData = reinterpret_cast<uint8_t*>(pFunc);
		pData < reinterpret_cast<uint8_t*>(pFunc) + fnSize - 4;
			pData++) {
			// LdrpInvertedFunctionTable
			if(*(size_t*)pData == 0xDEADDA7A) {
				dataOfs = pData - reinterpret_cast<uint8_t*>(pFunc);
				continue;
			}
			// DecodeSystemPointer address
			if(*(size_t*)pData == 0xDEADC0DE) {
				code_ofs = pData - reinterpret_cast<uint8_t*>(pFunc);
				break;
			}
			// LdrProtectMrdata address
			if(*(size_t*)pData == 0xDEADC0D2) {
				code_ofs2 = pData - reinterpret_cast<uint8_t*>(pFunc);
				continue;
			}
		}
		auto pDecode = mods.GetExport(mods.GetModule(L"ntdll.dll", Sections, mt), "RtlDecodeSystemPointer").procAddress;
		// Write handler data into target process
		if(!NT_SUCCESS(_pVEHCode.Write(0, fnSize, pFunc)) ||
			!NT_SUCCESS(_pVEHCode.Write(dataOfs, _proc.NativeLdr().LdrpInvertedFunctionTable())) ||
			!NT_SUCCESS(_pVEHCode.Write(code_ofs, static_cast<size_t>(pDecode))) ||
			!NT_SUCCESS(_pVEHCode.Write(code_ofs2, _proc.NativeLdr().LdrProtectMrdata()))) {
			_pVEHCode.Free();
			return LastNtStatus();
		}
		#endif
		// AddVectoredExceptionHandler(0, pHandler);
		auto pAddHandler = mods.GetExport(mods.GetModule(L"ntdll.dll", Sections, mt), "RtlAddVectoredExceptionHandler").procAddress;
		if(pAddHandler == 0)
			return STATUS_NOT_FOUND;
		a->reset();
		a.GenPrologue();
		a.GenCall(static_cast<size_t>(pAddHandler), {0, _pVEHCode.Ptr<size_t>()});
		_proc.Remote().AddReturnWithEvent(a, mt);
		a.GenEpilogue();
		_proc.Remote().ExecInWorkerThread(a->make(), a->getCodeSize(), result);
		_hVEH = static_cast<size_t>(result);
		return (_hVEH == 0 ? STATUS_NOT_FOUND : STATUS_SUCCESS);
	}
Exemplo n.º 2
0
/// <summary>
/// Inject VEH wrapper into process
/// Used to enable execution of SEH handlers out of image
/// </summary>
/// <param name="pTargetBase">Target image base address</param>
/// <param name="imageSize">Size of the image</param>
/// <returns>Error code</returns>
NTSTATUS MExcept::CreateVEH( size_t pTargetBase, size_t imageSize )
{    
    AsmJitHelper ea;
    uint64_t result = 0;
    
    // VEH codecave
    _pVEHCode = _proc.memory().Allocate( 0x2000 );
    _pVEHCode.Release();
    if (!_pVEHCode.valid())
        return LastNtStatus();

#ifdef USE64 
    asmjit::Label lExit = ea->newLabel();

    //
    // Assembly code for VectoredHandler64
    // 0x10 - EXCEPTION_RECORD.ExceptionAddress
    // 0x20 - EXCEPTION_RECORD.ExceptionInformation[0]
    // 0x30 - EXCEPTION_RECORD.ExceptionInformation[2]
    // 0x38 - EXCEPTION_RECORD.ExceptionInformation[3]
    //
    ea->mov( asmjit::host::rax, qword_ptr( asmjit::host::rcx ) );
    ea->cmp( asmjit::host::dword_ptr( asmjit::host::rax ), EH_EXCEPTION_NUMBER );
    ea->jne( lExit );
    ea->mov( asmjit::host::rdx, pTargetBase );
    ea->mov( asmjit::host::r8, asmjit::host::qword_ptr( asmjit::host::rax, 0x30 ) );
    ea->cmp( asmjit::host::r8, asmjit::host::rdx );;
    ea->jl( lExit );
    ea->add( asmjit::host::rdx, imageSize );
    ea->cmp( asmjit::host::r8, asmjit::host::rdx );;
    ea->jg( lExit );
    ea->cmp( asmjit::host::qword_ptr( asmjit::host::rax, 0x20 ), EH_PURE_MAGIC_NUMBER1 );;
    ea->jne( lExit );
    ea->cmp( asmjit::host::qword_ptr( asmjit::host::rax, 0x38 ), 0 );
    ea->jne( lExit );
    ea->mov( asmjit::host::qword_ptr( asmjit::host::rax, 0x20 ), EH_MAGIC_NUMBER1 );
    ea->mov( asmjit::host::rcx, qword_ptr( asmjit::host::rcx ) );
    ea->mov( asmjit::host::rdx, pTargetBase );
    ea->mov( asmjit::host::qword_ptr( asmjit::host::rax, 0x38 ), asmjit::host::rdx );
    ea->bind( lExit );
    ea->xor_( asmjit::host::rax, asmjit::host::rax );
    ea->ret();
    ea->emit( 0xCC );
    ea->emit( 0xCC );
    ea->emit( 0xCC );

    if (_pVEHCode.Write( 0, ea->getCodeSize(), ea->make() ) != STATUS_SUCCESS)
    {
        _pVEHCode.Free();
        return LastNtStatus();
    }
#else
    UNREFERENCED_PARAMETER( pTargetBase );
    UNREFERENCED_PARAMETER( imageSize );

    // Resolve compiler incremental table address if any
    void *pFunc = ResolveJmp( &VectoredHandler );
    size_t fnSize = static_cast<size_t>(SizeOfProc( pFunc ));
    size_t dataOfs = 0, code_ofs = 0;

    // Find and replace magic values
    for (uint8_t *pData = reinterpret_cast<uint8_t*>(pFunc);
          pData < reinterpret_cast<uint8_t*>(pFunc) + fnSize - 4; 
          pData++)
    {
        // LdrpInvertedFunctionTable
        if(*(size_t*)pData == 0xDEADDA7A)
        {
            dataOfs = pData - reinterpret_cast<uint8_t*>(pFunc);
            continue;
        }

        // DecodeSystemPointer address
        if(*(size_t*)pData == 0xDEADC0DE)
        {
            code_ofs = pData - reinterpret_cast<uint8_t*>(pFunc);
            break;
        }  
    }

    // Write handler data into target process
    if (_pVEHCode.Write( 0, fnSize, pFunc ) != STATUS_SUCCESS ||
         _pVEHCode.Write( dataOfs, _proc.nativeLdr().LdrpInvertedFunctionTable() ) != STATUS_SUCCESS ||
         _pVEHCode.Write( code_ofs, &DecodeSystemPointer ) != STATUS_SUCCESS)
    {
        _pVEHCode.Free();
        return LastNtStatus();
    }

#endif

    ea.GenPrologue();

    // AddVectoredExceptionHandler(0, pHandler);
    ea.GenCall( reinterpret_cast<void*>(&AddVectoredExceptionHandler), { 0, _pVEHCode.ptr<size_t>() } );

    _proc.remote().AddReturnWithEvent( ea );
    ea.GenEpilogue();

    _proc.remote().ExecInWorkerThread( ea->make(), ea->getCodeSize(), result );
    _hVEH = static_cast<size_t>(result);

    return (result == 0 ? STATUS_NOT_FOUND : STATUS_SUCCESS);
}