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Frida Intercept Encrypted Api

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CodeQL python frida ios android

📍What does it help?

Banking applications, e-wallets, .. are increasingly enhanced security to fight hackers. One of them is to encrypt request/response data when sending and receiving. Some weak encryptions can be decrypted easily, but some strong encryptions like RSA are difficult. When pentesting a normal mobile application, we just need to set it up so that BurpSuite can intercept the request / response of the APIs that the application uses. But when pentesting a banking or e-wallet application with end-to-end encrypted API, with the usual BurpSuite setup we cannot see the content of the API. Hooking into functions that send request/response and intercept data before it is encrypted is one way we can view and modify data.

Architecture

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For IOS

Configurage ios_handlers.js

  1. Add your Request / Response Class & Method
/*Request Class & Method*/
var search_request_class  = [''];
var search_request_method = [''];

/*Response Class & Method*/
var search_response_class  = [''];
var search_response_method = [''];`
  1. Debug ARGS in Class & Method
/*DEBUG REQUEST HERE*/
console.log(colors.green,"[DEBUG-REQUEST] Dump Arugment in method: ",colors.resetColor);
print_arguments(args);

For Android

Configurage android_handlers.js

  1. Add your Request / Response Class & Method
/*Request Class & Method*/
    var request_class = Java.use('');
    var request_method = '';

    /*Response Class & Method*/
    var response_class = Java.use('');
    var response_method = '';

Usage

  1. Load burpsuite_configuration_proxy.json or Set up Burpsuite Proxy by following the steps below
    • Listen on 127.0.0.1:26080
    • Redirect to 127.0.0.1:27080 and Check (Support invisible proxying)
  2. Run echoServer.py
  3. Config and optimize _handlers.js
  4. Run burpTracer.py -p com.apple.AppStore / [-n 'App Store']

Note: Different applications will use different libraries. You need to reverse or trace the application to find the correct function.

Technical Presentation

Title Link
Frida Intercept Encrypted Api https://medium.com/p/a5c4ef22a093
Frida Intercept Encrypted API | Technical | How to Intercept Encrypted APIs on The Application | Part 1 https://youtu.be/BIB3ma3Tl34
Frida Intercept Encrypted API | Technical | How to Intercept Encrypted APIs on The Application | Part 2 https://youtu.be/IojcakLNtrA