alert dns $HOME_NET any -> any any (msg:"ET INFO Digital Advertising Domain in DNS Lookup (ad-shield .io)"; dns.query; bsize:12; content:"ad-shield.io"; nocase; reference:url,www.ad-shield.io/; classtype:misc-activity; sid:2065812; rev:1; metadata:attack_target Client_and_Server, created_at 2025_11_18, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_18, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;)