alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY External IP Lookup - ip-whois"; flow:established,to_server; http.host; content:"ip-whois.net"; bsize:12; classtype:external-ip-check; sid:2020831; rev:7; metadata:attack_target Client_Endpoint, created_at 2015_04_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2024_11_26, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1614, mitre_technique_name System_Location_Discovery;)