Hacking
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Mobile Hacking Cheat Sheet






  28-Apr-2022 14:38:11



Code Tampering

To tamper an APK file, the foolowing steps should be performed:

  • Disassemble the app with apktool and save the smali code into output directory
apktool d <APK_file> -o <directory_output>
  • Modify the smali code of your app (or the resource files if needed)
  • Build the modified APK with apktool
apktool b <directory_output> -o <new_APK_file> 
  • Sign the APK (see Application Signing)
  • (Optional) Use zipalign to provide optimization to the APK file
zipalign -fv 4 <input_APK> <output_APK>

Frida


Installation

Install Frida and Python bindings on your system using pip

pip install frida frida-tools

Download the Frida server binary matching the targeted architecture and your Frida version

VER=`frida --version`
ABI=`adb shell getprop ro.product.cpu.abi`
wget https://github.com/frida/frida/releases/download/$VER/frida-server-$VER-android-$ABI.xz
xz -d frida-server-$VER-android-$ABI.xz

Upload and execute the Frida server binary on your Android device (root privileges are needed)

VER=`frida --version`
ABI=`adb shell getprop ro.product.cpu.abi`
adb root
adb push frida-server-$VER-android-$ABI /data/local/tmp/frida
adb shell "chmod 755 /data/local/tmp/frida" 
adb shell "/data/local/tmp/frida"

Tools

List running processes (emulators or devices connected through USB)

frida-ps -U 

List only installed applications

frida-ps -U  -i

Attach Frida client to the specified application (emulator or device connected through USB)

frida -U <package_name>

Spawn the specified application (emulator or device connected through USB)

frida -U -f <package_name> 

Spawn the specified application without any pause at the beginning (emulator or device connected through USB)

frida -U -f <package_name> --no-pause

Load a Frida script when attaching to the specified application

frida -U -l <script_file> <package_name>

Objection

Inject Frida Gadget library inside an APK file by specifying the targeted architecture (if emulator not running or device not connected)

objection patchapk --source <APK_file> -V <frida_version> --architecture <arch>

Inject Frida Gadget library inside an APK file using lastest Frida version available on Github (if emulator running or device connected to the device)

objection patchapk --source <APK_file>

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