Because Python is an interpreted language, compilers don't turn it into machine code. Instead, they bundle the Python interpreter, your compiled bytecode, and dependencies into a single package.
Converting the .pyc bytecode back into a standard .py script. Step 1: Extracting .pyc Files from the EXE
Paste the copied header bytes at the very beginning of the file (offset 0x00 ).
The script will analyze the executable and create a new directory named app.exe_extracted . Open this folder and look for the main executable file.
: If the original developer used PyInstaller's --key flag to encrypt the bytecode, simple extraction will fail. convert exe to py
Note: Recent versions of pyinstxtractor automatically fix this header for you. If your output files already have the .pyc extension and successfully unpack, you can proceed directly to Phase 3. If you need to fix it manually:
: A faster tool often used for newer Python versions like 3.10+, where uncompyle6 may struggle.
To extract the internal archive from a PyInstaller executable, you need a specialized extraction utility. The most reliable open-source tool for this task is (commonly known as pyinstxtractor ). Step 1: Set Up Your Environment
If you are a developer looking to distribute a Python application as an EXE, realizing how easy it is to reverse engineer can be alarming. To secure your intellectual property, implement these security layers: 1. Code Obfuscation (PyArmor) Because Python is an interpreted language, compilers don't
These files are critical because they contain the structural headers needed to fix your main bytecode file if it was extracted without them. Phase 2: Decompiling .pyc Files to .py Source Code
While decompilation is highly effective, the recovered code may not always match the original source code perfectly.
The decompiled output will look like encrypted strings, memory injection scripts, or a series of complex built-in evaluations ( eval() ).
When a Python script is packaged into an executable (commonly using tools like PyInstaller, auto-py-to-exe, or cx_Freeze), the Python source code is byte-compiled into .pyc files and bundled with the Python interpreter and required dependencies. This process is essentially one-way. Step 1: Extracting
Extract the internal archive files from the compiled executable binary. pyinstxtractor.py
: Splitting the EXE wrapper to extract the compiled Python bytecode ( .pyc ) files.
Open both your entry point file ( main ) and the reference file ( struct.pyc ) in a hex editor like HxD (Windows) or Hex Fiend (Mac).
If uncompyle6 runs into compatibility issues (e.g., if the executable was built with a very recent version of Python), you can use (often called pycdc ). This is a powerful, C++ based de-compiler that supports a wide variety of Python versions.
: If the developer protected the application using an obfuscation tool like PyArmor before packaging it into an EXE, the decompiled code will look like scrambled, unreadable gibberish.