jadx-eval-method

A PoC decompiler plugin for jadx-gui. Evaluates methods in runtime using frida and updates the decompiler output with the result. Main idea was to develop something specific to help solving the open obfuscator challenge.

Works only on static methods with a single string argument. Tested on jadx-gui v1.5.0.

Before:

Righ click on the method and select "Evaluate calls to this method":

After eval:

How to build

First copy or symlink the adb module from android sdk:

$ ln -s $NDK_HOME/python-packages/adb frida-proxy/adb

If you updated the protobuf, regenerate the python modules:

$ python -m grpc_tools.protoc -I src/main/proto --python_out=frida-proxy --pyi_out=frida-proxy --grpc_python_out=frida-proxy rpc.proto

Keep the frida-proxy daemon running on the side (dont forget to keep a phone or an emulator up):

$ cd frida-proxy
$ pip install -r requirements.txt
$ python main.py

Build the project:

$ ./gradlew dist

Install the plugin on jadx:

$ jadx plugins -j build/dist/jadx-eval-method.jar

Run jadx-gui:

$ jadx-gui challenge-pydroid.apk