Error: Proxy Required

[Hexboi]

Hi, I wondered if you ever encountered the scenario where the "victim" network had a network proxy in place, which forces the client connections to pass through it.

Here is the error code for context:

>>> exec(decoded_script)
Traceback (most recent call last):
  File "urllib\request.py", line 1348, in do_open
  File "http\client.py", line 1283, in request
  File "http\client.py", line 1329, in _send_request
  File "http\client.py", line 1278, in endheaders
  File "http\client.py", line 1038, in _send_output
  File "http\client.py", line 976, in send
  File "http\client.py", line 1448, in connect
  File "http\client.py", line 952, in connect
  File "http\client.py", line 925, in _tunnel
OSError: Tunnel connection failed: 407 Proxy Authorization Required

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 149, in <module>
  File "urllib\request.py", line 216, in urlopen
  File "urllib\request.py", line 519, in open
  File "urllib\request.py", line 536, in _open
  File "urllib\request.py", line 496, in _call_chain
  File "urllib\request.py", line 1391, in https_open
  File "urllib\request.py", line 1351, in do_open
urllib.error.URLError: <urlopen error Tunnel connection failed: 407 Proxy Authorization Required>

I tried setting variables both via Terminal, before launching Python and in the Python console itself using the "urllib.request" library, without success in both cases, code below for context:

PS C:\Users\testuser> set HTTP_PROXY=http://user:password@proxy.domain.local:8080
PS C:\Users\testuser> set HTTPS_PROXY=http://user:password@proxy.domain.local:8080
PS C:\Users\testuser> C:\Users\testuser\Downloads\python-3.10.11-embed-amd64\python.exe

import os
import urllib.request

# Set your proxy credentials
proxy_url = "proxyaddress:port"
proxy_user = "username"
proxy_pass = "password"

# Create proxy handler
proxy_handler = urllib.request.ProxyHandler({
    'http': f'http://{proxy_user}:{proxy_pass}@{proxy_url}',
    'https': f'https://{proxy_user}:{proxy_pass}@{proxy_url}'
})

# Install the opener
opener = urllib.request.build_opener(proxy_handler)
urllib.request.install_opener(opener)