alert dns $HOME_NET any -> any any (msg:"ET MALWARE Observed DNS Query to BlueMoon EK CnC"; dns.query; bsize:17; content:"data.curtis11.com"; fast_pattern; nocase; classtype:domain-c2; sid:2072078; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_09_17, deployment Perimeter, malware_family BlueMoonEK, performance_impact Low, confidence High, signature_severity Major, updated_at 2026_09_17; target:src_ip;)