DemoAPK

DemoAPk is a tool for modifying and editing the APK package name that has been decoded by APKEditor and includes a patcher for editing binary files.

Overview

DemodAPK is a Python-based tool designed to modify decompiled APK files. It enables developers to:

• Update Facebook App credentials (App ID, Client Token, Login Protocol Scheme).
• Rename package names in the APK manifest and associated files.
• Apply binary patches and remove metadata.

Features

• Package Renaming: Easily rename package names in APK files.
• Resource Modification: Modify resources in APK files as needed.
• Facebook API Updates: Automatically replaces Facebook App details in the appropriate XML files.
• Metadata Adjustment: Update application metadata in the AndroidManifest.xml file.
• Configurable Settings: Store and manage settings in a JSON configuration file.
• For educational purposes: You're learning how APK files work or exploring reverse engineering ethically.

Requirements

• Python 3.x
• Necessary libraries specified in requirements.txt

Installation

1. Clone the repository:

   git clone https://github.com/Veha0001/DemodAPK.git
   cd DemodAPK

2. Install the required libraries:

   pip install -r requirements.txt

Usage

Run the script with the following command:

python autogen.py --config <path_to_config.json> <apk_directory>

Patcher

python patcher.py <config_file>
# default is config.json

• Configuration of Patcher

{
  "Patcher": {
    "input_file": "apkdir/root/lib/arm64-v8a/libil2cpp.so",
    "dump_file": "dump.cs",
    "output_file": "libil2cpp_patched.so",
    "patches": [
      {
        "method_name": "UnlockAll",
        "hex_code": "20 00 80 D2 C0 03 5F D6"
      },
      {
        "offset": "0x111111",
        "hex_code": "1F 20 03 D5"
      },
      {
        "wildcard": "AA DD F5 ?? ?? ?? 00 01",
        "hex_code": "00 E0 AF D2 C0 03 5F D6"
      }
    ]
  }
}

Performance Notice

The patcher.py file may work slowly when performing wildcard scans. If you want to run it faster, consider using the C++ version.

Building the C++ Version

To build the C++ version, you will need to have g++ or gcc installed, along with the nlohmann-json library. You can build it using the following command:

g++ -o patcher patcher.cpp -O2

For Windows using MSYS2 First Install some package:

pacman -S mingw-w64-x86_64-gcc mingw-w64-x86_64-nlohmann-json gcc

Then run the gcc command: g++ patcher.cpp -o patcher.exe -O2

Note

Edit by method_name may work on some dump.cs file. The dump.cs file is get from Il2CppDumper.

Arguments

• --config: Path to the JSON configuration file (default: config.json).

• <apk_directory>: Path to the APK directory that contains the files to be modified.

Example

Run with a custom config file.

python autogen.py --config config.json /path/to/apk/directory

An Example of config.json

{
  "facebook": {
    "app_id": "1234567890",
    "client_token": "aaabbbcccddd0001",
    "login_protocol_scheme": "fb1234567890"
  },
  "package": {
    "new_name": "com.app.master",
    "new_path": "Lcom/app/master"
  },
  "files": [
    {
      "replace": {
        "target": "root/lib/arm64-v8a/libil2cpp.so",
        "source": "/path/to/external/bin.so",
        "backup": true
      }
    },
    {
      "replace": {
        "target": "resources/package_1/res/values/strings.xml",
        "source": "./path/to/external/strings_new.xml"
      }
    }
  ],
  "metadata_to_remove": [""],
  "Patcher": {
    "input_file": "apkdir/root/lib/arm64-v8a/libil2cpp.so",
    "dump_file": "dump.cs",
    "output_file": "libil2cpp_patched.so",
    "patches": [
      {
        "method_name": "UnlockAll",
        "hex_code": "20 00 80 D2 C0 03 5F D6"
      },
      {
        "offset": "0x111111",
        "hex_code": "1F 20 03 D5"
      },
      {
        "wildcard": "AA DD F5 ?? ?? ?? 00 01",
        "hex_code": "00 E0 AF D2 C0 03 5F D6"
      }
    ]
  }
}

Follow the prompts to select the APK file and modify its contents according to your preferences.

License

This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details.

Contributing

Contributions are welcome! Please open an issue or submit a pull request for any improvements or features.