alert dns $HOME_NET any -> any any (msg:"ET INFO External IP Lookup Domain (ipapi .co in DNS lookup)"; dns.query; content:"ipapi.co"; nocase; endswith; classtype:external-ip-check; sid:2024527; rev:6; metadata:attack_target Client_Endpoint, created_at 2017_08_08, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag IP_address_lookup_website, updated_at 2020_09_15, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1614, mitre_technique_name System_Location_Discovery;)