performing-dynamic-analysis-of-android-app

Performs runtime dynamic analysis of Android applications using Frida, Objection, and Android Debug Bridge to observe application behavior during execution, intercept function calls, modify runtime values, and identify vulnerabilities that static analysis misses. Use when testing Android apps for runtime security flaws, hooking sensitive methods, bypassing client-side protections, or analyzing obfuscated applications. Activates for requests involving Android dynamic analysis, runtime hooking, Frida Android instrumentation, or live app behavior analysis.

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Repository: mukul975/Anthropic-Cybersecurity-Skills
Last source activity: June 1, 2026 at 10:13
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name	performing-dynamic-analysis-of-android-app
description	Performs runtime dynamic analysis of Android applications using Frida, Objection, and Android Debug Bridge to observe application behavior during execution, intercept function calls, modify runtime values, and identify vulnerabilities that static analysis misses. Use when testing Android apps for runtime security flaws, hooking sensitive methods, bypassing client-side protections, or analyzing obfuscated applications. Activates for requests involving Android dynamic analysis, runtime hooking, Frida Android instrumentation, or live app behavior analysis.
domain	cybersecurity
subdomain	mobile-security
author	mahipal
tags	["mobile-security","android","frida","dynamic-analysis","owasp-mobile","penetration-testing"]
version	1.0.0
license	Apache-2.0
nist_csf	["PR.PS-01","PR.AA-05","ID.RA-01","DE.CM-09"]
mitre_attack	["T1059","T1056","T1036","T1078","T1027"]

Performing Dynamic Analysis of Android App

When to Use

Use this skill when:

Static analysis results need runtime validation on an actual Android device
The target app uses obfuscation (DexGuard, custom packers) that prevents effective static analysis
Testing requires observing actual API calls, decrypted data, or runtime-generated values
Assessing root detection, tamper detection, or anti-debugging implementations

Do not use this skill on production environments without authorization -- dynamic instrumentation can alter app behavior and trigger security alerts.

Prerequisites

Rooted Android device or emulator (Genymotion, Android Studio AVD with writable system)
Frida server installed on device matching the architecture (arm64, x86_64)
Python 3.10+ with frida-tools and objection packages
ADB configured and device connected
Target APK installed on device

Workflow

Step 1: Setup Frida Server on Android Device

# Check device architecture
adb shell getprop ro.product.cpu.abi
# Output: arm64-v8a

# Download matching Frida server from GitHub releases
# https://github.com/frida/frida/releases
# Push to device
adb push frida-server-16.x.x-android-arm64 /data/local/tmp/frida-server
adb shell chmod 755 /data/local/tmp/frida-server
adb shell /data/local/tmp/frida-server &

# Verify Frida connection
frida-ps -U

Step 2: Enumerate Application Attack Surface

# List all packages
frida-ps -U -a

# Attach Objection for high-level exploration
objection --gadget com.target.app explore

# List activities, services, receivers
android hooking list activities
android hooking list services
android hooking list receivers

# List loaded classes
android hooking list classes
android hooking search classes com.target.app

Step 3: Hook Sensitive Methods

# Hook all methods of a class
android hooking watch class com.target.app.auth.LoginManager

# Hook specific method with argument dumping
android hooking watch class_method com.target.app.auth.LoginManager.authenticate --dump-args --dump-return


android hooking watch class javax.crypto.Cipher --dump-args
android hooking watch class java.security.MessageDigest --dump-args


android hooking watch class okhttp3.OkHttpClient --dump-args
android hooking watch class java.net.URL --dump-args

// hook_crypto.js - Intercept encryption/decryption operations
Java.perform(function() {
    var Cipher = Java.use("javax.crypto.Cipher");

    Cipher.doFinal.overload("[B").implementation = function(input) {
        var mode = this.getAlgorithm();
        console.log("[Cipher] Algorithm: " + mode);
        console.log("[Cipher] Input: " + bytesToHex(input));

        var result = this.doFinal(input);
        console.log("[Cipher] Output: " + bytesToHex(result));
        return result;
    };

    function bytesToHex(bytes) {
        var hex = [];
        for (var i = 0; i < bytes.length; i++) {
            hex.push(("0" + (bytes[i] & 0xFF).toString(16)).slice(-2));
        }
        return hex.join("");
    }
});

# Execute custom Frida script
frida -U -f com.target.app -l hook_crypto.js --no-pause

// root_bypass.js - Common root detection bypass
Java.perform(function() {
    // Bypass RootBeer library
    var RootBeer = Java.use("com.scottyab.rootbeer.RootBeer");
    RootBeer.isRooted.implementation = function() {
        console.log("[RootBeer] isRooted() bypassed");
        return false;
    };

    // Bypass generic file-based root checks
    var File = Java.use("java.io.File");
    var originalExists = File.exists;
    File.exists.implementation = function() {
        var path = this.getAbsolutePath();
        var rootPaths = ["/system/app/Superuser.apk", "/system/xbin/su",
                         "/sbin/su", "/system/bin/su", "/data/local/bin/su"];
        if (rootPaths.indexOf(path) >= 0) {
            console.log("[Root] Blocked check for: " + path);
            return false;
        }
        return originalExists.call(this);
    };

    // Bypass SafetyNet/Play Integrity
    try {
        var SafetyNet = Java.use("com.google.android.gms.safetynet.SafetyNetApi");
        console.log("[SafetyNet] Class found - may need additional bypass");
    } catch(e) {}
});

// network_monitor.js - Monitor all HTTP requests
Java.perform(function() {
    // Hook OkHttp3
    try {
        var OkHttpClient = Java.use("okhttp3.OkHttpClient");
        var Interceptor = Java.use("okhttp3.Interceptor");
        var Chain = Java.use("okhttp3.Interceptor$Chain");

        console.log("[OkHttp] Monitoring network requests...");

        var Request = Java.use("okhttp3.Request");
        Request.url.implementation = function() {
            var url = this.url();
            console.log("[OkHttp] URL: " + url.toString());
            return url;
        };
    } catch(e) {
        console.log("[OkHttp] Not found, trying HttpURLConnection");
    }

    // Hook HttpURLConnection
    var URL = Java.use("java.net.URL");
    URL.openConnection.overload().implementation = function() {
        console.log("[URL] Opening: " + this.toString());
        return this.openConnection();
    };
});

# Using Objection for quick extraction
objection --gadget com.target.app explore

# Dump Android Keystore entries
android keystore list
android keystore dump

# Search heap for sensitive objects
android heap search instances com.target.app.model.User
android heap evaluate <handle> "JSON.stringify(clazz)"

# Memory string search
memory search "password" --string
memory search "api_key" --string

Term	Definition
Dynamic Instrumentation	Modifying application behavior at runtime by injecting code into the running process
Method Hooking	Replacing or wrapping function implementations to intercept arguments and return values
Frida Server	Daemon running on the target device that receives instrumentation commands from the host
Dalvik/ART Runtime	Android runtime environments; Frida hooks at the ART level for Java/Kotlin methods
Heap Inspection	Examining live objects in the application's memory heap to extract runtime data