Windows Python / Hook Injection

Code

import ctypes
from ctypes.wintypes import HHOOK, LPARAM, LRESULT, WPARAM


# The function to be injected as a hook
def HookFunction(code: int, wParam: WPARAM, lParam: LPARAM) -> LRESULT:
    # Perform malicious actions here

    # Return the result of the next hook in the chain
    return ctypes.windll.user32.CallNextHookEx(None, code, wParam, lParam)


def main():
    # Install the hook
    hHook = ctypes.windll.user32.SetWindowsHookEx(
        ctypes.c_int(14), HookFunction, None, 0
    )

    # Run the message loop to receive events
    msg = ctypes.wintypes.MSG()
    while ctypes.windll.user32.GetMessageW(ctypes.byref(msg), None, 0, 0):
        ctypes.windll.user32.TranslateMessageW(msg)
        ctypes.windll.user32.DispatchMessageW(msg)

    # Uninstall the hook
    ctypes.windll.user32.UnhookWindowsHookEx(hHook)


if __name__ == "__main__":
    main()