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Py2app - Create standalone Mac OS X applications with Python¶. Py2app is a Python setuptools command which will allow you to make standalone application bundles and plugins from Python scripts. Py2app is similar in purpose and design to py2exe for Windows. May 14, 2018 Turning it into a self-contained executable file that does not rely on having Python or other dependencies being installed. Creating a file that users could download in an expected file format. This means having a.exe or.msi for Windows, a.dmg for macOS, and a.deb for Ubuntu. Here’s what I did. Jan 27, 2019 I’ve just started programming with python, and I made my first application as a single executable file that can be installed and runs in any other computer even if it doesn’t have python. The creation of an executable using pyinstaller is very straightforward, customizable and very easy to do. In our example, we are going to create an executable of the following script. The filename of the script is file-creator.py and contains the following code (it just prompt the user for the name of a new file and the content).

Author: In Ming Loh (inming.loh@countercept.com - @tantaryu)
Company: Countercept (@countercept)
Website: https://www.countercept.com

Introduction

A script that helps researcher to unpack and decompile executable written in python. However, right now this only supports executable created with py2exe and pyinstaller.

This script glues together several tools available to the community. Hopefully, this can help people in their daily job. Several YARA rules are available to determine if the executable is written in python (This script also confirms if the executable is created with either py2exe or pyinstaller).

Requirements

Python 2.7 or later.
Install all the dependency needed:
pip2 install --user -r requirements.txt
or if you fancy to have your dependency installed with root permission
sudo pip2 install -r requirements.txt

Make Python Script Executable

Getting Started

python python_exe_unpack.py -i [malware.exe]
- pyinstaller
  - A folder will be created with the original filename concatenated with '_extracted'. For example: 'malware.exe_extracted'.
  - The main python file that contains the logic will usually be the file without any extension (In the folder that concatenated with '_extracted'). In the following example, 'hello' is the one that contains the main python logic:
    -rw-rw-r-- 1 testuser testuser 70K Nov 14 13:08 bz2.pyd
    -rw-rw-r-- 1 testuser testuser 993K Nov 14 13:08 _hashlib.pyd
    -rw-rw-r-- 1 testuser testuser 111 Nov 14 13:08 hello
    -rw-rw-r-- 1 testuser testuser 1009 Nov 14 13:08 hello.exe.manifest
    -rw-rw-r-- 1 testuser testuser 1.1K Nov 14 13:08 Microsoft.VC90.CRT.manifest
    -rw-rw-r-- 1 testuser testuser 220K Nov 14 13:08 msvcm90.dll
    -rw-rw-r-- 1 testuser testuser 557K Nov 14 13:08 msvcp90.dll
    -rw-rw-r-- 1 testuser testuser 638K Nov 14 13:08 msvcr90.dll
    -rw-rw-r-- 1 testuser testuser 628K Nov 14 13:08 out00-PYZ.pyz
    drwxrwxr-x 2 testuser testuser 12K Nov 14 13:08 out00-PYZ.pyz_extracted
    -rw-rw-r-- 1 testuser testuser 5.2K Nov 14 13:08 pyiboot01_bootstrap
    -rw-rw-r-- 1 testuser testuser 2.5K Nov 14 13:08 pyimod01_os_path
    -rw-rw-r-- 1 testuser testuser 12K Nov 14 13:08 pyimod02_archive
    -rw-rw-r-- 1 testuser testuser 22K Nov 14 13:08 pyimod03_importers
    -rw-rw-r-- 1 testuser testuser 0 Nov 14 13:08 pyi-windows-manifest-filename hello.exe.manifest
    -rw-rw-r-- 1 testuser testuser 2.6M Nov 14 13:08 python27.dll
    -rw-rw-r-- 1 testuser testuser 10K Nov 14 13:08 select.pyd
    -rw-rw-r-- 1 testuser testuser 234 Nov 14 13:08 struct
    -rw-rw-r-- 1 testuser testuser 671K Nov 14 13:08 unicodedata.pyd
  - pyinstaller has an option that can encrypt python bytecode. This script will try to decrypt it and decompile the decrypted code.
- py2exe
  - The result of unpacking and decompiling will be located in folder 'unpacked' or the location you specify.
  - If error like this shows 'Error in unpacking the exe. Probably due to version incompability (exe created using python 2 and run this script with python 3)', try setting your python to a different version than the one you are using. Eg: 'alias python=python2' or 'alias python=python3'
python python_exe_unpack.py -p [pyc file]
- In the above example, sometimes the python file that contains the main logic will not be in the format that uncompyle6 accept (Missing python magic numbers). The above command will prepend magic numbers and decompile it (If magic number is already preprended it will not add it and just proceed with decompiling).