alert dns $HOME_NET any -> any any (msg:"ET INFO Observed DNS Query to *.ngrok Domain (ngrok .pro)"; dns.query; dotprefix; content:".ngrok.pro"; nocase; endswith; classtype:misc-activity; sid:2059169; rev:2; metadata:attack_target Client_Endpoint, created_at 2025_01_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2025_01_14, reviewed_at 2025_08_26, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1572, mitre_technique_name Protocol_Tunneling; target:src_ip;)