51 lines
2.9 KiB
Typst
51 lines
2.9 KiB
Typst
#import "../lib.typ": todo, APK, IDE, SDK, DEX, ADB, ART, eg, XML, AXML
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== Android Reverse Engineering Tools <sec:bg-tools>
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Due to the specificities of Android, the usual tools for reverse engineering are not enough.
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#todo[blabla intro in @sec:bg-tools]
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#todo[References in @sec:bg-tools]
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=== Android Studio <sec:bg-android-studio>
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The whole Android developement ecosystem is packaged by Google in the #IDE Android Studio.
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In practice, Android Studio is a source-code editor that wrap arround the different tools of the android #SDK.
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The #SDK tools and packages can be installed manually with the `sdkmanager` tool.
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Among the notable tools in the #SDK, they are:
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- `emulator`: an Android emulator.
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This tools allow to run an emulated Android phone on a computer.
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Although very usefull, Android emulator has several limitation.
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For once, it cannot emulate another achitecture.
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An x86_64 computer cannot emulate an ARM smartphone.
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This can be an issue because a majority of smartphone run on ARM processor.
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Also, for certain version of Android, the proprietary GooglePlay libraries are not available on rooted emulators.
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Lastly, emulators are not designed to be stealthy and can easily be detected by an application.
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Malware will avoid detection by not running their payload on emulators.
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- #ADB: a tool to send commands to Android smartphone or emulator.
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It can be used to install applications, send instructions, events, and generally perform debuging operations.
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- Platform Packages: Those packages contains data associated to a version of android needed to compile an application.
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Especially, they contains the so call `android.jar` files.
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- `d8`: The main use of `d8` is to convert java bytecode files (`.class`) to Android #DEX format.
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It can also be used to perform different level of optimization of the bytecode generated.
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- `aapt`/`aapt2` (Android Asset Packaging Tool): This tools is used to build the #APK file.
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Behind the scene, it we convert #XML to binary #AXML and ensure the right files have the right compression and alignment. (#eg some ressource files are mapped in memory by the #ART, and thus need to be aligned and not compressed).
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- `apksigner`: the tool used to sign an #APK file.
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=== Apktool <sec:bg-apktool>
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Apktool is a *reengineering tool* for Android #APK files.
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It can be used to disassemble an application: it will extract the files from the #APK file, convert the binary #AXML to text #XML, and use smali/backsmali to convert the #DEX files to smali, an assembler-like langage that match the Dalvik bytecode instructions.
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The main strenght of Apktool is that after having disassemble an application, the content of the application can be edited and reassemble into a new #APK.
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=== Androguard <sec:bg-androguard>
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Androguard is a python library for parsing and analysing #APK files.
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=== Jadx <sec:bg-jadx>
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=== Soot <sec:bg-soot>
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=== Frida <sec:bg-frida>
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