alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO External IP Lookup (keycdn .com)"; flow:established,to_server; http.method; content:"GET"; http.user_agent; content:"keycdn-tools|3a|"; fast_pattern; http.uri; content:"/geo.json?host="; startswith; http.host; content:"tools.keycdn.com"; bsize:16; reference:url,tools.keycdn.com/geo; classtype:bad-unknown; sid:2039772; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_11_14, deployment Perimeter, deployment SSLDecrypt, 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;)