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PAPIMonitor (Python API Monitor for Android apps) is a python tool based on Frida for monitoring user-select APIs during the app execution. The app should be installed within an emulator already connected through ADB to the pc host. The user can choose to monitor a predefined list of APIs divided into several categories (e.g., Device Data, Device Info, SMS) or a custom list of APIs passed through the command line to the script. The tool stores the invoked API, the parameters, the return value, and the line and file from where it was called.

Below is an example of output:

{   
    "category": "Custom", 
    "class": "com.dave.popupre.MainActivity", 
    "method": "getText", 
    "args": [], 
    "calledFrom": "com.dave.popupre.MainActivity$1.onClick(MainActivity.java:26)", 
    "returnValue": "Hello Toast!", 
    "time": "03/09/2021, 14:43:06"
}

:warning: Warning with Google Emulator

Google EmulatorUbuntuWindowsMacOS
7.x x86:heavy_check_mark::heavy_check_mark::heavy_check_mark:
8.x x86:heavy_check_mark::heavy_check_mark::heavy_check_mark:
9.0 x86:heavy_check_mark::heavy_check_mark::heavy_check_mark:
10.0 x86:heavy_check_mark::heavy_check_mark::heavy_check_mark:
11.0 x86:heavy_check_mark::heavy_check_mark::heavy_check_mark:
12.0 x86:heavy_check_mark::heavy_check_mark::heavy_check_mark:

:warning: Frida seems broken on Android 11-12 (x86_64) (Google Emulatore).


Installation

General requirements:

sudo apt-get install libjpeg-dev zlib1g-dev

Installation with pyenv and virtualenv

pyenv install 3.8.0
pyenv virtualenv 3.8.0 papi-monitor
pyenv activate 3.8.0/envs/papi-monitor
pip3 install -r requirements

Installation with virtualenv

sudo apt-get install python3-virtualenv
virtualenv env
source env/bin/activate
pip install -r requirements

Post Installation


Usage

python papi_monitor.py --package-name com.package.name --filter "Crypto"
python papi_monitor.py --file-apk app.apk --api-monitor api_personalized.json
python papi_monitor.py --package-name com.package.name --api-monitor api_personalized.json
python papi_monitor.py --package-name com.package.name --filter "ALL"
python papi_monitor.py --package-name com.package.name --api-monitor api_personalized.json --store-script True --filter "Crypto" "Crypto - Hash"
python papi_monitor.py --package-name com.package.name --api-monitor api_personalized.json --pinning-bypass --antiroot-bypass     

Predefined Categories


Frida Script

A lot of Frida Script for Android can be found here.