alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY External IP Lookup - free .ipwhois .io"; flow:established,to_server; http.method; content:"GET"; http.host; content:"free.ipwhois.io"; fast_pattern; classtype:external-ip-check; sid:2029185; rev:4; metadata:attack_target Client_Endpoint, created_at 2019_12_20, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag IP_address_lookup_website, updated_at 2024_11_26, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1614, mitre_technique_name System_Location_Discovery;)