alert dns $HOME_NET any -> any any (msg:"ET INFO External IP Lookup Domain (ipleak .net) in DNS Lookup"; dns.query; content:"ipleak.net"; endswith; nocase; classtype:misc-activity; sid:2072064; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_09_17, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2026_09_17, mitre_tactic_id TA0043, mitre_tactic_name Reconnaissance, mitre_technique_id T1590, mitre_technique_name Gather_Victim_Network_Information;)