alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET INFO ChatGPT-User Traffic Detected Inbound M1"; flow:established,to_server; http.user_agent; content:"ChatGPT-User/"; threshold:type limit, count 1, seconds 300, track by_dst; classtype:misc-activity; sid:2045755; rev:1; metadata:attack_target Web_Server, created_at 2023_05_18, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_05_18; target:dest_ip;)