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Service Detection

nmap -p3128 -sC -sV -Pn TARGET
Example
PORT     STATE SERVICE    VERSION
3128/tcp open  http-proxy Squid http proxy 4.14
|_http-server-header: squid/4.14
|_http-title: ERROR: The requested URL could not be retrieved

Internal Port Scanning via Squid

Spose — Squid Port Scanner

https://github.com/aancw/spose
git clone https://github.com/aancw/spose.git
cd spose
python3 spose.py --proxy TARGET:3128 --target INTERNAL_IP
Example output
10.10.10.5:3306 seems OPEN
10.10.10.5:8080 seems OPEN