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Reversing Android 0x00

Hello all! I'm Hai Nguyen, and today I'll post my very first reversing Android tutorial. In this blog, I'll write about the preparation of setup tools related to Android.

Setup (Windows)

First, you need to install these things:

Android Installation

  • In Android Studio installation, you just follow the setup wizard and install any recommended SDK packages.
  • After finishing the installation, you should go to Virtual Device Manager and create a new device.
  • In the Select Hardware window, you can choose your device as you want: in that case, you should choose the smallest size of device to display all the screens easily.
  • Then click Next to go to the System Image window. You must select a device that supports root permission. I prefer to select Google APIs for the new device, and it will support root permission.
  • Note: You should look at the Play Store column and select a device with no Play Store icon, that device should have Google APIs. Click on the Next button to verify your new device and finish the installation.

Frida Server Setup

  • First, you should set the environment path for adb.exe in system variables (make sure file adb.exe is located in the platform-tools folder).
  • Download the latest frida-server on this GitHub release.
  • Note that you have to select a frida-server that matches your device architecture. The format is the following: frida-server-xx.xx.xx-android-your_arch.xz
  • Then make sure your version of frida-server is the same as your frida-tools: frida --version
  • If you were successful in the previous step, you can start your Android emulator and try this command to see your connected devices: adb devices
  • Next, type adb root to promote your current permission to root. If it does not show anything, it means your adb has been run with root.
  • Then use the commands below:
$ adb push <frida-server-file-path> /data/local/tmp
$ adb shell "chmod 755 /data/local/tmp/frida-server"
$ adb shell "/data/local/tmp/frida-server &"
  • Now you can verify the frida-server file is running by using this command in another terminal: adb shell "ps -A | grep frida"
  • You should see your frida-server running as root. So that is the final step in setting up frida-server in your Android emulator. Thanks for reading!