This blogpost explains all the steps I took while analyzing the Cabassous/FluBot malware. I wrote this while analyzing the sample and I've written down both successful and failed attempts at moving forward, as well as my thoughts/options along the way. As a result, this blogpost is not a writeup of the Cabassous/FluBot malware, but rather … Continue reading How to analyze mobile malware: a Cabassous/FluBot Case study
Latest update: June 2025 During a mobile assessment, there will typically be two sub-assessments: The mobile frontend, and the backend API. In order to examine the security of the API, you will either need extensive documentation such as Swagger or Postman files, or you can let the mobile application generate all the traffic for you … Continue reading Proxying Android app traffic – Common issues / checklist (June 2025)
TL;DR - In this post, we'll explore some mobile malware: how to create them, what they can do, and how to avoid them. Are you interested in learning more about how to protect your phone from shady figures? Then this blog post is for you. Introduction We all know the classic ideas about security on … Continue reading Backdooring Android Apps for Dummies
In a previous blogpost, I explained my steps for reversing the flutter.so binary to identify the correct offset/pattern to bypass certificate validation. As a very quick summary: Flutter doesn't use the system's proxy settings, and it doesn't use the system's certificate store, so normal approaches don't work. My previous guide only explained how to intercept … Continue reading Intercepting Flutter traffic on Android (ARMv8)
TL;DR: Follow these steps to intercept traffic using Burp with a self made root CA on Android (or any browser) The problem In a previous blogpost, we presented a Magisk module that easily integrates user certificates into the system CA store in order to bypass Android N's new hardened security model. For instrumenting applications, this … Continue reading Using a custom root CA with Burp for inspecting Android N traffic
Intercepting HTTPS traffic is a necessity with any mobile security assessment. By adding a custom CA to Android, this can easily be done. As of Android Nougat, however, apps don't trust client certificates anymore unless the app explicitly enables this. In this blogpost, we present a new Magisk module, that circumvents this requirement, by automatically adding … Continue reading Intercepting HTTPS Traffic from Apps on Android 7+ using Magisk & Burp
