alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING GoogleSheets API V4 Activity (Fetch Single Cell with A1 Notation)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/v4/spreadsheets/"; startswith; fast_pattern; content:"/values/"; distance:0; content:"!"; distance:0; pcre:"/^([A-Z][0-9]):([A-Z][0-9])$/UR"; http.host; bsize:21; content:"sheets.googleapis.com"; reference:url,developers.google.com/sheets/api/guides/concepts; classtype:bad-unknown; sid:2063450; rev:2; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_08_16, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_07_14, former_sid 2857963;)