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Xfinity OTP Extractor

This Frida script extracts the stored OTP seed from the Xfinity Android application's "Code Generator". It achieves this by hooking into the VaultImpl class within the application and extracting the encoded secret from the keystore. The resulting seed value can be used in any TOTP authenticator such as Google Authenticator, Bitwarden, or Authy.

High-Level Overview

The script performs the following steps:

  1. Targeting: It searches the Android heap for active instances of android.cim.comcast.com.comcastmobilevault.impl.VaultImpl.
  2. Fallback Instantiation: If no instance is found on the heap, it attempts to manually instantiate VaultImpl using the application context.
  3. Extraction: Once an instance is acquired, it probes the xal.totpEntitiesVaultGroup for stored keys.
  4. Processing: For each key found, it reads the encrypted JSON data, decrypts it using the app's native vault logic, and extracts the secret field.
  5. Encoding/Decoding: It uses BouncyCastle's Base64 and Base32 classes (found in the app's own libraries) to process the extracted secret into a standard format usable by TOTP authenticators.

Requirements

  • Device: A rooted Android device or an environment where you have sufficient permissions to run Frida, such as a patched Xfinity app containing a Frida gadget.
  • Frida: Ensure frida-server or frida-gadget is running on the device.
  • Dependencies: This script is designed to be run via frida and assumes the target Xfinity APK is installed and running on the device.
  • Xfinity App: Must be logged in to your Xfinity account and have "Two-step verification" and the "Code Generator" enabled in the settings.

Usage

  1. Start the Xfinity app on the target device and make sure you are logged in.
  2. Ensure frida-server is running as root on the device.
  3. Execute the script using Frida:
frida -U -p $(adb shell pidof com.comcast.mobile.xfinity) -l extract.js

AI Disclosure

This project and its associated scripts were developed with the assistance of Gemini AI model, which provided architectural analysis of the Xfinity APK, helped resolve issues with library usage, and assisted in debugging the Frida hook implementation.