alert dns $HOME_NET any -> any any (msg:"ET INFO External IP Lookup Domain DNS Lookup (my-ip .io)"; dns.query; dotprefix; content:".my-ip.io"; nocase; endswith; classtype:bad-unknown; sid:2034196; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_10_15, 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;)