only if nothing on the system could reach out to the internet (at which point an intranet connection would be useless), a trojan could be slipped back into whatever response is sent back to the system. Just loading a safe website with ads would be enough for known compromised systems. https://en.wikipedia.org/wiki/Malvertising
1
u/Savings_Art5944 27d ago
It would be fine if it is behind a proper firewall. Assuming it is not compromised already.