alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED External IP Lookup ip-api.com"; flow:established,to_server; content:"GET"; http_method; content:"/xml"; http_uri; content:"ip-api.com"; fast_pattern:only; http_header; classtype:external-ip-check; sid:2021406; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_07_13, 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;)