Google Sites lure page embedding attacker iframe (fake Codex installer)

This rule detects two components of a malicious campaign using Google Sites to host fake OpenAI Codex installer lures. The first rule detects when a response body from an external server contains an iframe pointing to the domain 'bright-links.com'. The second rule detects client-side requests to Google Sites paths containing 'codex', indicating a user is navigating to the lure page.