alert dns $HOME_NET any -> any any (msg:"ET INFO EasyTier Mesh VPN Domain (stun .easytier .cn) in DNS Lookup"; dns.query; bsize:16; content:"stun.easytier.cn"; nocase; reference:url,github.com/EasyTier/EasyTier; classtype:misc-activity; sid:2068135; rev:1; metadata:affected_product Any, attack_target Client_and_Server, created_at 2026_03_10, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Mesh_VPN, updated_at 2026_03_10, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1219, mitre_technique_name Remote_Access_Software;)