alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY External IP Lookup"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/iplookup/iplookup.php?format="; fast_pattern; reference:md5,6096ace9002792e625a0cdb6aec3f379; classtype:external-ip-check; sid:2019126; rev:5; metadata:attack_target Client_Endpoint, created_at 2014_09_05, 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;)