Gepetto is a Python script which uses OpenAI's ChatGPT to provide meaning to functions decompiled by IDA Pro.

Setup

Simply drop this script into your IDA plugins folder ($IDAUSR/plugins).

You will need to add the required packages to IDA's Python installation for the script to work. Find which interpreter IDA is using by checking the following registry key: Computer\HKEY_CURRENT_USER\Software\Hex-Rays\IDA (default on Windows: %LOCALAPPDATA%\Programs\Python\Python39). Finally, with the corresponding interpreter, simply run:

[/path/to/python] -m pip install -r requirements.txt

⚠️ You will also need to edit the script and add your own API key, which can be found on this page. Please note that ChatGPT queries are not free (although not very expensive) and you will need to setup a payment method.

You may use the undocumented API by changing "useundocumentated" to True and setting "authorization" to the __Secure-next-auth.session-token cookie at https://chat.openai.com/chat

Usage

Once the plugin is installed properly, you should be able to invoke it from the context menu of IDA's pseudo code windows, as shown in the screenshot below:

Limitations

• The plugin requires access to the HexRays decompiler to function.
• ChatGPT is a general-purpose chatbot and may very well get things wrong! Always be critical of results returned!

Acknowledgements

• OpenAI, for making this incredible chatbot, obviously
• Kaspersky, for funding all my research