dllhook

dllhook is a tool for hooking Windows x86 applications. This tools injects embedded Python interpreter (Python DLL) to the application and executes your script. And also this provides a convenient hooking library to use in your script.
This tool uses mayhem python_injector as injector.
See https://github.com/zeroSteiner/mayhem/blob/master/tools/python_injector.py
When you clone this repository, you must also clone submodule mayhem.
This tool is tested on Python 3.6-3.9.

Installation

Make sure you use 32-bit version of Python.
This package requires capstone. To install capstone, in Visual Studio Developer Command Prompt:

python -mpip install capstone

To install dllhook:

python -mpip install dllhook

Usage

• Write your python script to inject.

import ctypes
import dllhook

# @dllhook.hook_dll('Kernel32.dll', 0x00014510) also works
@dllhook.hook_dll('Kernel32.dll', b'CreateProcessW')
def see_process(arg1):
    if arg1 != 0:
        print("<hooked> ", ctypes.wstring_at(arg1))

• Save it as a file. (e.g. C:\Users\example\Desktop\see_process.py)

• Execute module dllhook with the target program and your script as the arguments.

python -mdllhook "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe" C:\Users\example\Desktop\see_process.py

Console output:

[+] Opened a handle to pid: 24308
[*] Found Python library at: C:\Users\example\AppData\Local\Programs\Python\Python36-32\python36.dll
[*] Injecting Python into the process...
[+] Loaded C:\Users\example\AppData\Local\Programs\Python\Python36-32\python36.dll with handle 0x69ee0000
[*] Resolved addresses:
  - Py_InitializeEx:    0x6a061cc0
  - PyRun_SimpleString: 0x6a07b1c0
[*] Initialized Python in the host process
[*] Waiting for client to connect on \\.\pipe\mayhem
[*] Client connected on named pipe
target: 0x75ae4510
invoke: 0x6c401df0
callbacker: 0x6620fdc
<hooked> C:/Program Files (x86)/Adobe/Acrobat Reader DC/Reader/ARH.exe
<hooked> C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe

Author

cosine0 @github