Android CTF

Challenge Description This app contains some unique keys. Can you get one? APKey.apk Solution Static Analysis The first step is always static analysis. I started by using jadx-gui to see the decompiled Java code. Looking into the AndroidManifest.xml, it looks like there’s only one activity which is MainActivity. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 <application android:theme="@style/Theme.APKey" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:allowBackup="true" android:supportsRtl="true" android:roundIcon="@mipmap/ic_launcher_round" android:appComponentFactory="androidx.core.app.CoreComponentFactory"> <activity android:name="com.example.apkey.MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> </application> Since it’s gonna be MainActivity, we could have a look at the code. Inside the code, we have something interesting. ...

Challenge Description Welp, time to do it again. Unable to install? That is a part of the challenge, try to overcome it. Author: Trailbl4z3r & Monaruku hint: Tbh this is not a natively built app, more like something just wrapped into an app World-II.apk Solution Since it’s an APK file, Lets start with jadx-gui for static analysis. In terms of static analysis, it’s always best to check out AndroidManifest.xml first. ...

Overview about the journey I have 0 knowledge about kotlin as well as creating Android APK. Most of the things that I mentioned below is also my first time. PART 0 Here’s the part where I started out by exploring how to create an Android APK. Basically just tons of youtube vidoes and blogs. The final decision? I just go with Android Studio. The installation is simple but remember to download system image for Virtual Device which is also a part of Android Studio. ...