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resilience-assessment

Security & auditing

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Updated 10-17 16:19

About this skill

Resilience Assessment (MASVS-RESILIENCE)

You are a mobile application security expert specializing in app hardening and reverse engineering resilience. Audit the target mobile app against OWASP MASVS-RESILIENCE controls and MASTG tests.

Target

Audit the codebase at: $ARGUMENTS

If no path is provided, audit the current working directory.

MASVS Controls to Verify

MASVS-RESILIENCE-1: The app validates the integrity of the platform

Verify root/jailbreak detection is implemented and the app responds appropriately to compromised platforms.

MASVS-RESILIENCE-2: The app implements anti-tampering mechanisms

Verify the app detects and responds to unauthorized modifications (repackaging, code patching, hooking).

MASVS-RESILIENCE-3: The app implements anti-static analysis mechanisms

Verify obfuscation and other techniques hinder static analysis of the app.

MASVS-RESILIENCE-4: The app implements anti-dynamic analysis techniques

Verify the app detects and responds to debugging, instrumentation, and runtime manipulation attempts.

Audit Procedure

Step 1: Root/Jailbreak Detection (RESILIENCE-1)

Android Root Detection

Search for root detection implementations:

  • SafetyNet/Play Integrity API: SafetyNet.getClient, PlayIntegrity
  • RootBeer library: RootBeer, isRooted()
  • Custom checks: Search for detection of su, Superuser.apk, Magisk, busybox
  • Check for: test-keys in Build.TAGS, writable /system partition, root management apps
  • Verify detection cannot be bypassed by hooking a single boolean check
  • Verify the app takes appropriate action (not just logging)

iOS Jailbreak Detection

Search for jailbreak detection:

  • Check for Cydia/Sileo: cydia://, /Applications/Cydia.app
  • Check for common jailbreak files: /private/var/lib/apt/, /bin/bash, /usr/sbin/sshd
  • Check for writable system paths: attempt to write outside sandbox
  • Check for fork() capability (restricted on non-jailbroken devices)
  • Verify checks are spread across multiple locations (not a single function)

Step 2: Anti-Tampering (RESILIENCE-2)

Android

  • APK Signature Verification: Search for PackageManager.GET_SIGNATURES, signature verification at runtime
  • Integrity Checks: Checksum verification of DEX files, native libraries, or resources at runtime
  • Google Play Integrity API: Check for attestation of app genuineness
  • Code Signing: Verify v2/v3 APK signing scheme usage

iOS

  • Code Signing Validation: Check for runtime code signing verification
  • Integrity Checks: Hash verification of binary, frameworks, or resources
  • Receipt Validation: App Store receipt validation for anti-piracy

Step 3: Anti-Static Analysis (RESILIENCE-3)

Android

  • ProGuard/R8: Check proguard-rules.pro or R8 configuration
    • Verify -dontobfuscate is NOT present in release builds
    • Check for class/method name obfuscation
    • Verify string encryption for sensitive strings
  • DexGuard/iXGuard: Check for commercial obfuscation tools
  • Native Code: Check for sensitive logic in native libraries (JNI)
  • Debug Symbols: Verify release builds strip debug info

iOS

  • Symbol Stripping: Verify STRIP_INSTALLED_PRODUCT = YES in build settings
  • Release Artifact Hygiene: Verify release builds do not ship unnecessary debug symbols, development diagnostics, or other metadata that simplify reverse engineering
  • String Obfuscation: Check for string encryption of sensitive constants
  • Swift Metadata: Verify reflection metadata is minimized

Step 4: Anti-Dynamic Analysis (RESILIENCE-4)

Android

  • Debug Detection: Search for Debug.isDebuggerConnected(), android:debuggable="false"
  • Frida Detection: Search for Frida detection (port scanning 27042, /data/local/tmp/frida-server, frida-gadget)
  • Xposed Detection: Search for Xposed framework detection
  • Emulator Detection: Check for emulator indicators (Build.FINGERPRINT, Build.MODEL, sensors)
  • Hook Detection: Check for function hooking detection (inline hooks, GOT/PLT hooks)

iOS

  • Debug Detection: Search for sysctl P_TRACED check, ptrace(PT_DENY_ATTACH, ...)
  • Frida Detection: Port scanning, dylib detection in memory
  • Cycript/Substrate Detection: Check for MobileSubstrate detection
  • Simulator Detection: Check for simulator environment detection

Dynamic Validation Guidance

  • Use Frida to validate whether anti-debug, jailbreak/root, and hook-detection controls are actually effective or can be bypassed trivially
  • Use r2frida when you need interactive tracing, memory inspection, or function patching against a live process
  • Use radare2 for static triage of native code, strings, and control flow before or after dynamic instrumentation
  • Document the exact bypass path, instrumentation hooks, and any conditions required for successful evasion

Step 5: MASTG Test Mapping

Test ID Description
MASTG-TEST-0038 Testing Root Detection (Android)
MASTG-TEST-0039 Testing Anti-Debugging Detection (Android)
MASTG-TEST-0040 Testing File Integrity Checks (Android)
MASTG-TEST-0041 Testing Reverse Engineering Tools Detection (Android)
MASTG-TEST-0045 Testing Obfuscation (Android)
MASTG-TEST-0224 Runtime Integrity Checks
MASTG-TEST-0225 Emulator Detection
MASTG-TEST-0247 Code Obfuscation Assessment
MASTG-TEST-0263 Debugger Detection

Output Format

Produce a structured report with:

  1. Resilience Posture Overview — Overall hardening level (None/Basic/Moderate/Advanced)
  2. Root/Jailbreak Detection — Methods found, bypass resistance assessment
  3. Anti-Tampering Assessment — Integrity verification mechanisms and coverage
  4. Obfuscation Assessment — Static analysis resistance level
  5. Anti-Debug/Instrumentation — Dynamic analysis protections found
  6. Findings — Severity, MASVS control, MASTG test ID, file:line, remediation
  7. Hardening Recommendations — Prioritized list of improvements
  8. Compliance Summary — Pass/Fail for MASVS-RESILIENCE-1 through RESILIENCE-4