alert dns $HOME_NET any -> any any (msg:"ET INFO External IP Lookup Domain in DNS Lookup (ipwho .is)"; dns.query; content:"ipwho.is"; nocase; bsize:8; classtype:bad-unknown; sid:2037042; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_06_21, 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;)