Two weeks ago, I reverse-engineered a “secure” banking app that claimed to use “military-grade encryption.” Turns out, they stored user PINs in plaintext in iOS Keychain. With one Frida script, I bypassed biometric auth and accessed any account. The bank paid $5000 after I demonstrated draining test accounts. Here’s the raw technical breakdown — no theory, just what worked.
Press enter or click to view image in full size
“If the app trusts the client, you win.”
Most mobile breaches happen because:
- Hardcoded secrets (API keys in strings.xml)
- Insecure local storage (Keychain/SharedPrefs)
- Lack of certificate pinning (Easy MITM)
Step 1: Downloaded the App
- Used an Android emulator (Genymotion) for testing
- Installed the target app from APKMirror (always test older versions — they’re weaker)
Step 2: Ran MobSF for Quick Wins
python3 manage.py runserver