Python WinAppDbg Template Constructs

Source: https://gitlab.com/vitali.kremez/winappdbg_contruct
Credit: WinappDbg; Parsia
###########################
#### WinAppDbg ###########
##########################

I. GetRunnerProcess

    if (args.run):
        # Concat all arguments into a string
        myargs = " ".join(args.run)

        if win32.PathFileExists(args.run[0]) is True:
            # File exists
            # Create a Debug object
            debug = winappdbg.Debug()

            try:
                # Debug the app
                # First item is program and the rest are arguments
                # execl: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/debug.py#L358
                my_process = debug.execl(myargs)

                print("Attached to {0} - {1}".format(my_process.get_pid(),
                                               my_process.get_filename()))

                # Keep debugging until the debugger stops
                debug.loop()

            finally:
                # Stop the debugger
                debug.stop()
                print("[*] Debugger stopped.")

        else:
            print("{0} not found.".format(args.run[0]))
        exit()

II. GetSystemInformation()

    if(args.sysinfo):
        # Create a System object
        # https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/system.py#L66
        system = winappdbg.System()

        # Use the built-in WinAppDbg table
        # https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/textio.py#L1094
        table = winappdbg.Table("\t")

        # New line
        table.addRow("", "")

        # Header
        title = ("System Information", "")
        table.addRow(*title)

        # Add system information
        table.addRow("------------------")
        table.addRow("Bits", system.bits)
        table.addRow("OS", system.os)
        table.addRow("Architecture", system.arch)
        table.addRow("32-bit Emulation", system.wow64)
        table.addRow("Admin", system.is_admin())
        table.addRow("WinAppDbg", winappdbg.version)
        table.addRow("Process Count", system.get_process_count())

        print table.getOutput()
        exit()


III. GetProcessList
    if (args.getprocesses):

        system = winappdbg.System()

        # We can reuse example 02 from the docs
        # https://winappdbg.readthedocs.io/en/latest/Instrumentation.html#example-2-enumerating-running-processes
        table = winappdbg.Table("\t")
        table.addRow("", "")

        header = ("pid", "process")
        table.addRow(*header)

        table.addRow("----", "----------")

        processes = {}

        # Add all processes to a dictionary then sort them by pid
        for process in system:
            processes[process.get_pid()] = process.get_filename()

        # Iterate through processes sorted by pid
        for key in sorted(processes.iterkeys()):
            table.addRow(key, processes[key])

        print table.getOutput()
        exit()


IV.AttachByProcessID
    if (args.pid):
        system = winappdbg.System()

        # Get all pids
        pids = system.get_process_ids()

        if args.pid in pids:
            # pid exists

            # Create a Debug object
            debug = winappdbg.Debug()

            try:
                # Attach to pid
                # attach: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/debug.py#L219
                my_process = debug.attach(args.pid)

                print "Attached to %d - %s" % (my_process.get_pid(),
                                               my_process.get_filename())

                # Keep debugging until the debugger stops
                debug.loop()

            finally:
                # Stop the debugger
                debug.stop()
                print "Debugger stopped."

        else:
            print "pid %d not found." % (args.pid)

        exit()


V. AttachByProcessName
    if (args.pname):
        debug = winappdbg.Debug()

        # example 3:
        # https://winappdbg.readthedocs.io/en/latest/_downloads/03_find_and_attach.py

        try:
            debug.system.scan()
            for (process, name) in debug.system.find_processes_by_filename(args.pname):
                print "Found %d, %s" % (process.get_pid(),
                                        process.get_filename())

                debug.attach(process.get_pid())

                print "Attached to %d-%s" % (process.get_pid(),
                                             process.get_filename())

            debug.loop()

        finally:
            # Stop the debugger
            debug.stop()
            print "Debugger stopped."
        exit()


VI. WriteLoggerOutput
    global logger
    if args.output:
        # verbose=False disables printing to stdout
        logger = winappdbg.Logger(args.output, verbose=False)
    else:
        logger = winappdbg.Logger()


# Example
# logger.log_text("Started %d - %s" % (my_process.get_pid(), my_process.get_filename()))


VII. GetLoadedModules
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    def load_dll(self, event):
        """
        Called when a new module is loaded.
        """
        # https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/module.py#L71

        """
        Module object methods:
        get_base, get_filename, get_name, get_size, get_entry_point,
        get_process, set_process, get_pid,
        get_handle, set_handle, open_handle, close_handle

        get_size and get_entry_point do not work because WinAppDbg internally
        uses GetModuleInformation.
        https://msdn.microsoft.com/en-us/library/ms683201(v=VS.85).aspx
        And it cannot get info on files with "that were loaded with the
        LOAD_LIBRARY_AS_DATAFILE flag.""

        This is related:
        https://blogs.msdn.microsoft.com/oldnewthing/20150716-00/?p=45131
        """
        module = event.get_module()

        logstring = "\nLoaded DLL:\nName: %s\nFilename: %s\nBase Addr: %s\n" % \
            (module.get_name(), module.get_filename(), hex(module.get_base()))

        mylogger.log_text(logstring)

        # _ = module.get_size()

        print module.get_handle()

# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


VIII. GetProcessCreateProcessInfo
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    def create_process(self, event):
        process  = event.get_process()
        pid      = event.get_pid()
        # pid    = process.get_pid()
        filename = process.get_filename()

        mylogger.log_text("CreateProcess %d - %s" % (pid, filename))

    def exit_process(self, event):
        process  = event.get_process()
        pid      = event.get_pid()
        # pid    = process.get_pid()
        filename = process.get_filename()

        mylogger.log_text("ExitProcess %d - %s" % (pid, filename))

    def create_thread(self, event):
        process  = event.get_process()
        thread   = event.get_thread()

        tid  = thread.get_tid()
        name = thread.get_name()

        mylogger.log_text("CreateThread %d - %s" % (tid, name))

    def exit_thread(self, event):
        process  = event.get_process()
        thread   = event.get_thread()

        tid  = thread.get_tid()
        name = thread.get_name()

        mylogger.log_text("ExitThread %d - %s" % (tid, name))


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


IX. BasicHookFunction
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    def load_dll(self, event):
        module = event.get_module()

        if module.match_name("kernel32.dll"):

            # Resolve function addresses
            address_CreateFileA = module.resolve("CreateFileA")
            address_CreateFileW = module.resolve("CreateFileW")

            # Types are here
            # https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/win32/defines.py#L380
            sig_CreateFileA = (PVOID, DWORD, DWORD, PVOID, DWORD, DWORD, HANDLE)
            sig_CreateFileW = (PVOID, DWORD, DWORD, PVOID, DWORD, DWORD, HANDLE)

            pid = event.get_pid()

            # Hook function(pid, address, preCB, postCB, paramCount, signature)
            # https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/breakpoint.py#L3969
            event.debug.hook_function(pid, address_CreateFileA,
                                      preCB=pre_CreateFileA,
                                      postCB=post_CreateFileA,
                                      signature=sig_CreateFileA)

            event.debug.hook_function(pid, address_CreateFileW,
                                      preCB=pre_CreateFileW,
                                      postCB=post_CreateFileW,
                                      signature=sig_CreateFileW)

            # Another way of setting up hooks without signature

            """
            event.debug.hook_function(pid, address_CreateFileA,
                                      preCB=pre_CreateFileA,
                                      postCB=post_CreateFileA,
                                      paramCount=7)

            event.debug.hook_function(pid, address_CreateFileW,
                                      preCB=pre_CreateFileW,
                                      postCB=post_CreateFileW,
                                      paramCount=7)
            """

# Callback functions
# -------------------

# Callback function parameters are always
# (event, ra (return address), then function parameters)
# self is first if part of the eventhandler class


def pre_CreateFileW(event, ra, lpFileName, dwDesiredAccess, dwShareMode,
                    lpSecurityAttributes, dwCreationDisposition,
                    dwFlagsAndAttributes, hTemplateFile):

    """
    This will be called as soon as we enter the function and before the
    function stack frame is created.
    """

    process = event.get_process()

    # Suspend the process because why not
    process.suspend()
    mylogger.log_text("Hit kernel32!CreateFileW")

    # 32-bit so all parameters are on stack

    # In case you want a pointer to the top of the stack
    # thread = event.get_thread()

    # All memory read stuff are at
    # https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/process.py#L125

    # fUnicode=True because we are in the Wide or Unicode version of the API
    myFileName = process.peek_string(lpFileName, fUnicode=True)

    mylogger.log_text("lpFilename: %s" % (myFileName))

    # Resume the process
    process.resume()


def pre_CreateFileA(event, ra, lpFileName, dwDesiredAccess, dwShareMode,
                    lpSecurityAttributes, dwCreationDisposition,
                    dwFlagsAndAttributes, hTemplateFile):

    process = event.get_process()

    # Suspend the process because why not
    process.suspend()

    mylogger.log_text("Hit kernel32!CreateFileA")

    # fUnicode=False because we are in the ANSI version
    myFileName = process.peek_string(lpFileName, fUnicode=False)

    mylogger.log_text("lpFilename: %s" % (myFileName))

    process.resume()


def post_CreateFileW(event, retval):

    mylogger.log_text("Leaving kernel32!CreateFileW")
    mylogger.log_text("Return value: %x" % (retval))


def post_CreateFileA(event, retval):

    mylogger.log_text("Leaving kernel32!CreateFileA")
    mylogger.log_text("Return value: %x" % (retval))


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


X. BetterHookFunction
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    # Better hooking
    # https://winappdbg.readthedocs.io/en/latest/Debugging.html#example-9-intercepting-api-calls

    apiHooks = {

        # Hooks for the kernel32 library.
        "kernel32.dll": [

            # We have seen these before
            # Function       Signature
            ("CreateFileA", (PVOID, DWORD, DWORD, PVOID, DWORD, DWORD, HANDLE)),
            ("CreateFileW", (PVOID, DWORD, DWORD, PVOID, DWORD, DWORD, HANDLE)),

            # Can also pass parameter count
            # ("CreateFileA", 6),
            # ("CreateFileW", 6),
        ],
    }

    # Now we can simply define a method for each hooked API.
    # "pre_"  methods are called when entering the hooked function.
    # "post_" methods are called when returning from the hooked function.

    def pre_CreateFileW(self, event, ra, lpFileName, dwDesiredAccess,
                        dwShareMode, lpSecurityAttributes, dwCreationDisposition,
                        dwFlagsAndAttributes, hTemplateFile):

        process = event.get_process()
        myFileName = process.peek_string(lpFileName, fUnicode=True)
        mylogger.log_text("pre_CreateFileW opening file %s" % (myFileName))

    def post_CreateFileW(self, event, retval):
        mylogger.log_text("Return value: %x" % retval)

    def pre_CreateFileA(self, event, ra, lpFileName, dwDesiredAccess,
                        dwShareMode, lpSecurityAttributes, dwCreationDisposition,
                        dwFlagsAndAttributes, hTemplateFile):

        process = event.get_process()
        myFileName = process.peek_string(lpFileName, fUnicode=False)
        mylogger.log_text("pre_CreateFileA opening file %s" % (myFileName))

    def post_CreateFileA(self, event, retval):
        mylogger.log_text("Return value: %x" % retval)


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


XI. HookInternetExplorer HttpSendRequestW
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    """
        BOOL HttpSendRequest(
            _In_ HINTERNET hRequest,
            _In_ LPCTSTR   lpszHeaders,
            _In_ DWORD     dwHeadersLength,
            _In_ LPVOID    lpOptional,
            _In_ DWORD     dwOptionalLength
        );
    """

    apiHooks = {

        # Hooks for the wininet.dll library - note this is case-sensitive
        "wininet.dll": [

            # Function            Signature
            ("HttpSendRequestW", (HANDLE, PVOID, DWORD, PVOID, DWORD)),
        ],
    }

    def pre_HttpSendRequestW(self, event, ra, hRequest, lpszHeaders,
                             dwHeadersLength, lpOptional, dwOptionalLength):

        process = event.get_process()

        if dwHeadersLength != 0:
            mylogger.log_text(winapputil.utils.get_line())
            mylogger.log_text("HttpSendRequestW")

            headers = process.peek_string(lpszHeaders, fUnicode=True)
            mylogger.log_text("Headers %s" % (headers))

        if dwOptionalLength != 0:
            # This is not unicode - see the pointer name (lp vs. lpsz)
            # fUnicode is set to False (default) then
            optional = process.peek_string(lpOptional, fUnicode=False)

            mylogger.log_text("Optional %s" % (optional))
            mylogger.log_text(winapputil.utils.get_line())


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()




XII. HookInternetExplorer HttpSendRequestW/HttpOpenRequest
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    """
        BOOL HttpSendRequest(
            _In_ HINTERNET hRequest,
            _In_ LPCTSTR   lpszHeaders,
            _In_ DWORD     dwHeadersLength,
            _In_ LPVOID    lpOptional,
            _In_ DWORD     dwOptionalLength
        );

        HINTERNET HttpOpenRequest(
          _In_ HINTERNET hConnect,
          _In_ LPCTSTR   lpszVerb,
          _In_ LPCTSTR   lpszObjectName,
          _In_ LPCTSTR   lpszVersion,
          _In_ LPCTSTR   lpszReferer,
          _In_ LPCTSTR   *lplpszAcceptTypes,
          _In_ DWORD     dwFlags,
          _In_ DWORD_PTR dwContext
        );
    """

    apiHooks = {

        # Hooks for the wininet.dll library - note this is case-sensitive
        "wininet.dll": [

            # Function            Signature
            ("HttpSendRequestW", (HANDLE, PVOID, DWORD, PVOID, DWORD)),
            ("HttpOpenRequestW", (HANDLE, PVOID, PVOID, PVOID, PVOID, PVOID,
                                  DWORD, PVOID)),
        ],
    }

    def pre_HttpSendRequestW(self, event, ra, hRequest, lpszHeaders,
                             dwHeadersLength, lpOptional, dwOptionalLength):

        process = event.get_process()

        if dwHeadersLength != 0:
            mylogger.log_text(winapputil.utils.get_line())
            mylogger.log_text("HttpSendRequestW")

            headers = process.peek_string(lpszHeaders, fUnicode=True)
            mylogger.log_text("Headers %s" % (headers))

        if dwOptionalLength != 0:
            # This is not unicode - see the pointer name dummy (lp vs. lpsz)
            # False by default but a good idea to include it for clarity
            optional = process.peek_string(lpOptional, fUnicode=False)

            mylogger.log_text("Optional %s" % (optional))
            mylogger.log_text(winapputil.utils.get_line())

    def pre_HttpOpenRequestW(self, event, ra, hConnect, lpszVerb,
                             lpszObjectName, lpszVersion, lpszReferer,
                             lplpszAcceptTypes, dwFlags, dwContext):

        process = event.get_process()

        verb = process.peek_string(lpszVerb, fUnicode=True)
        if verb is None:
            verb = "GET"

        obj = process.peek_string(lpszObjectName, fUnicode=True)

        mylogger.log_text(winapputil.utils.get_line())
        mylogger.log_text("HttpOpenRequestW")
        mylogger.log_text("verb: %s" % verb)
        mylogger.log_text("obj : %s" % obj)
        mylogger.log_text(winapputil.utils.get_line())


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


XIII. HoookFireFoxFunction PR_Write
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    # Better hooking
    # https://winappdbg.readthedocs.io/en/latest/Debugging.html#example-9-intercepting-api-calls

    """
    PRInt32 PR_Write(
        PRFileDesc *fd,
        const void *buf,
        PRInt32 amount);

    fd:     A pointer to the PRFileDesc object for a file or socket
    buf:    A pointer to the buffer holding the data to be written
    amount: The amount of data, in bytes, to be written from the buffer
    """

    apiHooks = {

        # Hooks for the nss3.dll library
        'nss3.dll': [

            ('PR_Write', (PVOID, PVOID, PVOID)),
        ],
    }

    def pre_PR_Write(self, event, ra, fd, buf, amount):

        process = event.get_process()

        if (amount > 100) and (amount < 1000):
            mylogger.log_text("PR_Write")

            # https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/process.py#L1581
            contents = process.read(buf, amount)

            mylogger.log_text("%s" % str(contents))

            mylogger.log_text(winapputil.utils.get_line())


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


XIV. ModifySleep on x86/X64
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    # Better hooking
    # https://winappdbg.readthedocs.io/en/latest/Debugging.html#example-9-intercepting-api-calls

    """
    VOID WINAPI Sleep(
        _In_ DWORD dwMilliseconds
    );
    https://msdn.microsoft.com/en-us/library/windows/desktop/ms686298(v=vs.85).aspx
    """

    apiHooks = {

        # Hooks for the kernel32.dll library
        "kernel32.dll": [

            # Note how are passing only one parameter
            ("Sleep", (DWORD, )),

            # We can also pass the number of arguments instead of signature
            # ("Sleep", 1),
        ],
    }

    def pre_Sleep(self, event, ra, dwMilliseconds):

        process = event.get_process()
        process.suspend()

        thread = event.get_thread()

        bits = thread.get_bits()
        emulation = thread.is_wow64()

        logstring = "Original dwMilliseconds %d" % dwMilliseconds

        mylogger.log_text(logstring)

        # If running on a 32-bit machine or 32-bit process on 64-bit machine
        if bits == 32 or emulation is True:
            top_of_stack = thread.get_sp()

            # return_address, dwMilliseconds = thread.read_stack_dwords(2)
            # logstring = "Return Address %s" % \
            #     winappdbg.HexDump.address(return_address, bits)

            # mylogger.log_text(logstring)

            process.write_dword(top_of_stack+((bits/8)*1), 0)

        # AMD64 calling convention on Windows uses fastcall
        # rcx, rdx, r8, r9 then stack

        elif bits == 64:
            thread.set_register("Rcx", 10000)

        process.resume()
# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


XV. ModifyDomainFunction in IE InternetConnectW
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    # Better hooking
    # https://winappdbg.readthedocs.io/en/latest/Debugging.html#example-9-intercepting-api-calls

    """
    HINTERNET InternetConnect(
      _In_ HINTERNET     hInternet,
      _In_ LPCTSTR       lpszServerName,
      _In_ INTERNET_PORT nServerPort,
      _In_ LPCTSTR       lpszUsername,
      _In_ LPCTSTR       lpszPassword,
      _In_ DWORD         dwService,
      _In_ DWORD         dwFlags,
      _In_ DWORD_PTR     dwContext
    );
    """

    apiHooks = {

        # Hooks for the wininet.dll library
        "wininet.dll": [

            # InternetConnectW
            # https://msdn.microsoft.com/en-us/library/windows/desktop/aa384363(v=vs.85).aspx
            # ("InternetConnectW", (HANDLE, PVOID, WORD, PVOID, PVOID, DWORD, DWORD, PVOID)),
            ("InternetConnectW", 8),

        ],
    }

    # Now we can simply define a method for each hooked API.
    # Methods beginning with "pre_" are called when entering the API,
    # and methods beginning with "post_" when returning from the API.

    def pre_InternetConnectW(self, event, ra, hInternet, lpszServerName,
                             nServerPort, lpszUsername, lpszPassword,
                             dwService, dwFlags, dwContext):

        process = event.get_process()
        process.suspend()
        thread = event.get_thread()

        server_name = process.peek_string(lpszServerName, fUnicode=True)
        print(server_name)

        if server_name == "example.com":

            # mylogger.log_text(server_name)

            # Encoding as UTF16
            new_server_name = "google.com".encode("utf-16le")

            # Get length of new payload
            payload_length = len(new_server_name)

            # Allocate memory in target process and get a pointer
            new_payload_addr = event.get_process().malloc(payload_length)

            # Write the new payload to that pointer
            process.write(new_payload_addr, new_server_name)

            top_of_stack = thread.get_sp()

            bits = thread.get_bits()
            emulation = thread.is_wow64()

            if bits == 32 or emulation is True:

                # Write the pointer to the new payload with the old one
                process.write_dword(top_of_stack + 8, new_payload_addr)

            elif bits == 64:
                thread.set_register("Rdx", new_payload_addr)

        process.resume()


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()

XVI. RegistryReader RegQueryValueExW

class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    # Better hooking
    # https://winappdbg.readthedocs.io/en/latest/Debugging.html#example-9-intercepting-api-calls

    """
    LONG WINAPI RegQueryValueEx(
      _In_        HKEY    hKey,
      _In_opt_    LPCTSTR lpValueName,
      _Reserved_  LPDWORD lpReserved,
      _Out_opt_   LPDWORD lpType,
      _Out_opt_   LPBYTE  lpData,
      _Inout_opt_ LPDWORD lpcbData
    );
    """

    apiHooks = {

        # Hooks for the adviapi32.dll library
        # Can also hook kernel32.dll
        "advapi32.dll": [

            # RegQueryValueEx
            # https://msdn.microsoft.com/en-us/library/windows/desktop/ms724911(v=vs.85).aspx
            # ("RegQueryValueExW", (HANDLE, PVOID, PVOID, PVOID, PVOID, PVOID)),
            ("RegQueryValueExW", 6),

        ],
    }

    def pre_RegQueryValueExW(self, event, ra, hKey, lpValueName, lpReserved,
                             lpType, lpData, lpcbData):

        # Store the pointer for later use
        self.hKey = hKey
        self.lpValueName = lpValueName
        self.lpType = lpType
        self.lpData = lpData
        self.lpcbData = lpcbData

    def post_RegQueryValueExW(self, event, retval):
        process = event.get_process()

        process.suspend()

        table = winappdbg.Table("\t")
        table.addRow("", "")

        # Need to watch out for optional parameters
        if self.lpType is not 0:
            keyType = process.read_dword(self.lpType)
            table.addRow("keyType", keyType)

        valueName = process.peek_string(self.lpValueName, fUnicode=True)
        size = process.read_dword(self.lpcbData)

        table.addRow("valueName", valueName)
        table.addRow("size", size)

        if self.lpData is not 0:
            data = process.read(self.lpData, size)
            table.addRow("data", data)
            table.addRow("data-hex", data.encode("hex"))

        mylogger.log_text(table.getOutput())
        mylogger.log_text("-"*30)

        process.resume()


# Create an instance of our eventhandler class
myeventhandler = DebugEvents()


XVII RegistryWriter
class DebugEvents(winappdbg.EventHandler):
    """
    Event handler class.
    event: https://github.com/MarioVilas/winappdbg/blob/master/winappdbg/event.py
    """

    # Better hooking
    # https://winappdbg.readthedocs.io/en/latest/Debugging.html#example-9-intercepting-api-calls

    """
    LONG WINAPI RegQueryValueEx(
      _In_        HKEY    hKey,
      _In_opt_    LPCTSTR lpValueName,
      _Reserved_  LPDWORD lpReserved,
      _Out_opt_   LPDWORD lpType,
      _Out_opt_   LPBYTE  lpData,
      _Inout_opt_ LPDWORD lpcbData
    );
    """

    apiHooks = {

        # Hooks for the advapi32.dll library
        "advapi32.dll": [

            # RegQueryValueEx
            # https://msdn.microsoft.com/en-us/library/windows/desktop/ms724911(v=vs.85).aspx
            # ("RegQueryValueExW", (HANDLE, PVOID, PVOID, PVOID, PVOID, PVOID)),
            ("RegQueryValueExW", 6),

        ],
    }

    def pre_RegQueryValueExW(self, event, ra, hKey, lpValueName, lpReserved,
                             lpType, lpData, lpcbData):

        # Store the pointer for later use
        self.hKey = hKey
        self.lpValueName = lpValueName
        self.lpType = lpType
        self.lpData = lpData
        self.lpcbData = lpcbData

    def post_RegQueryValueExW(self, event, retval):
        process = event.get_process()

        process.suspend()

        valueName = process.peek_string(self.lpValueName, fUnicode=True)

        if valueName == "layout":
            # size = process.read_dword(self.lpcbData)
            # data = process.read(self.lpData, size)

            newLayout = 0x00

            process.write_dword(self.lpData, newLayout)

            # OR
            # process.write(self.lpData, "00".decode("hex"))

        process.resume()
# Create an instance of our eventhandler class
myeventhandler = DebugEvents()

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