alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Google Calendar in Use"; flow:established,to_server; http.uri; content:"/calendar/"; http.header; content:"www.google.com"; threshold:type both, count 1, seconds 60, track by_src; reference:url,www.computerworld.com.au/index.php?id=1687889918&eid=-255; classtype:policy-violation; sid:2003597; rev:5; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_06;)