PyDll-Injector

Python DLL injector for Windows. Supports various injection methods.

Features

PyDll-Injector comes with the following features:

• DLL Injection on app start: Injects DLL(s) into a process when it starts;
• Env variables support: Enables you to pass environmental variables to the injected DLL;
• Multiple injection methods: Supports various injection methods;
• Check if process is running: Checks if a process is running after injection;
• Graceful process termination: Allows you to terminate the spawned process;
• Ready to use CLI: Comes with a command line interface for easy usage.

Injection methods

The following injection methods are supported:

• standard: Classic CreateRemoteThread + LoadLibraryA;
• apc: QueueUserAPC + LoadLibraryA. Target thread must enter an alertable state;
• nt: NtCreateThreadEx + LoadLibraryA (stealthier than CreateRemoteThread);
• hook: SetWindowsHookExA(WH_CBT) injection. DLL must export HookProc.

Usage

You can use PyDll-Injector via the command line interface or as a library in your Python code.

CLI

Install the package on your system:

pip install pydll-injector[cli]

You can now use PyDll-Injector from the command line like this:

pydll-injector --executable-file "A:\Path\To\App.exe" --dll-list "B:\Path\To\Your.dll"

For the list of all available CLI options, run:

pydll-injector --help

This injector also allows you to pass configuration via a toml file. Here is a sample configuration file:

[launcher]
executable_file = "A:\\Path\\To\\App.exe"
cmd_line_args = "-arg1 -arg2"
dll_list = [
    "B:\\Path\\To\\Your.dll",
]
injection_method = "nt"

[environment]
vars = ["FOO=bar", "BAZ=qux"]
use_system_env = true
environment_append = false

Library

First, install the package. For example, using uv:

uv add pydll-injector

You can now import the library and use it in your Python code:

from pydll_injector.process import spawn_process, is_process_running
from pydll_injector.models import Launcher, Environment

def main() -> None:
    launcher = Launcher(
        executable_file= r"A:\Path\To\App.exe",
        cmd_line_args="",
        dll_list=[r"B:\\Path\\To\\Your.dll"],
        injection_method='apc',
    )
    env = Environment(
        vars=["FOO=bar"],
        use_system_env=True,
        environment_append=False
    )

    ctx = spawn_process(launcher, env)
    while is_process_running(ctx):
        pass

    print("Process has exited.")

if __name__ == "__main__":
    main()

License

The project is distributed under the MIT License. See the LICENSE file for details.