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This Tool is selected asBlackHat Arsenal USA 2020

• Deoptfuscator is a tool for deobfuscating Android applications that have been transformed using control-flow obfuscation mechanisms.
• Deoptfuscator can reverse the control-flow obfuscation performed by DexGuard on open-source Android applications.

• More details about Obfuscapk can be found in the paper "Deoptfuscator: Defeating Advanced Control-flow Obfuscation Using Android Runtime (ART)". You can cite the paper as follows:

@article{you2022deoptfuscator,    title = "Deoptfuscator: Defeating Advanced Control-flow Obfuscation Using Android Runtime (ART)",    journal = "IEEE Access",    volume = "10",    pages = "61426-61440",    year = "2022",    issn = "2169-3536",    doi = "10.1109/ACCESS.2022.3181373",    url = "https://ieeexplore.ieee.org/document/9791370",    author = "You, Geunha and Kim, Gyoosik and Han, Sangchul and Park, Minkyu and Cho, Seong-je",    keywords = "Android app, malicious app, obfuscation, deobfuscation, control-flow obfuscation" }

In order to build and run deoptfuscator, the followings are required:

• Deoptfuscator based on Ubuntu 18.04 LTS 64bit PC
  • libboost, libjson (C++ library)

    $ sudo apt-get install libboost-all-dev  $ sudo apt-get install libjsoncpp-dev

  • openjdk

    $ sudo apt-get install openjdk-11-jdk

  • i386 libc

    $ sudo dpkg --add-architecture i386  $ sudo apt-get update  $ sudo apt-get install libc6:i386 libstdc++6:i386

  • zipalign

    $ sudo apt-get install zipalign

  • apksigner

    $ sudo apt-get install apksigner

• deoptfuscator's repositary need git-lfs
• Git LFS

$ curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | sudo bash$ sudo apt install git-lfs$ git clone https://github.com/Gyoonus/deoptfuscator.git

Our repository Already Contains Tools needed to run our Tool

• Apktools :https://ibotpeaches.github.io/Apktool/
• fbredex :https://fbredex.com/

• Set Local Environment

  $ . ./launch.sh

  OR

   $ source ./launch.sh

• Deobfuscate an Android application that has been transformed using control-flow obfuscated techniques.

  $ python3 deoptfuscator.py <obfuscated_apk>

• Test our tools!

  $ python3 deoptfuscator.py test/AndroZoo_DexGuard_apk/com.alienguns.scifirifles_4F326C99558145BB636D31C96488823A.apk

  • If the input file (an obfuscated app) wascom.alienguns.scifirifles_4F326C99558145BB636D31C96488823A.apk, the file name of the deobfuscated apk iscom.alienguns.scifirifles_4F326C99558145BB636D31C96488823A_deobfuscated_align.apk

• Our tool can effectively deobfuscate Android applications transformed with the control flow obfuscation option of DexGuard :

  • Our tool can currently handle the control-flow obfuscation techniques of DexGuard.
  • It cannot handle other obfuscation techniques such as layout obfuscation, identifier renaming, and string encryption.

• E-mail : gyoonus at gmail dot com [Gyoosik Kim(김규식)]
• Mobile : 082)10-9888-2792

• This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science and ICT (no. 2018R1A2B2004830)