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The **magic number** in this case for python3.8 is **`0x550d0d0a`**, then, to fix this error you will need to **add** at the **begging** of the **.pyc file** the following bytes: `0x0d550a0d000000000000000000000000`
**Other errors** like: `class 'AssertionError'>; co_code should be one of the types (<class 'str'>, <class 'bytes'>, <class 'list'>, <class 'tuple'>); is type <class 'NoneType'>` may appear.
This probably means that you **haven't added correctly** the magic number or that you haven't **used** the **correct magic number**, so make **sure you use the correct one** (or try a new one).
The tool [https://github.com/countercept/python-exe-unpacker](https://github.com/countercept/python-exe-unpacker) glues together several tools available to the community that **helps researcher to unpack and decompile executable** written in python (py2exe and pyinstaller).
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).
Currently with unpy2exe or pyinstxtractor the Python bytecode file we get might not be complete and in turn it **can’t be recognized by uncompyle6 to get the plain Python source code**. This is caused by a missing Python **bytecode version number**. Therefore we included a prepend option; this will include a Python bytecode version number into it and help to ease the process of decompiling. When we try to use uncompyle6 to decompile the .pyc file it returns an error. However, **once we use the prepend option we can see that the Python source code has been decompiled successfully**.
If you weren't able to extract the python "original" code following the previous steps, then you can try to **extract** the **assembly** (but i**t isn't very descriptive**, so **try** to extract **again** the original code).In [here](https://bits.theorem.co/protecting-a-python-codebase/) I found a very simple code to **dissasemble** the _.pyc_ binary (good luck understanding the code flow). If the _.pyc_ is from python2, use python2:
1. Install the py2exe package from [http://www.py2exe.org/](http://www.py2exe.org)
2. For the payload (in this case, we will name it hello.py), use a script like the one in Figure 1. The option “bundle\_files” with the value of 1 will bundle everything including Python interpreter into one exe.
3. Once the script is ready, we will issue the command “python setup.py py2exe”. This will create the executable, just like in Figure 2.
1. Install PyInstaller using pip (pip install pyinstaller).
2. After that, we will issue the command “pyinstaller –onefile hello.py” (a reminder that ‘hello.py’ is our payload). This will bundle everything into one executable.
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