How does the Python code need to be adapted from Python2 to Python3 for this Exchange PowerShell implementation?

Key adaptations include converting string concatenation to byte concatenation (e.g., using `+` with `struct.pack`), and decoding base64 streams with `ISO-8859-1` instead of `utf-8` to avoid invisible character issues. The article also notes returning `base64.b64encode(output).decode('utf-8')` for Python3 compatibility. For more on webshell techniques, see Penetration Basics - Implementation of Webshell Supporting NTLM Over HTTP Protocol.