alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT BlueMoon EK JS Loader M3"; flow:established,to_client; content:"|2e|get|28 22|"; content:"|3f 20 22 3f|msg|3d 22 20 2b 20|encodeURIComponent|28|"; content:"|29 2e|slice|28|0|2c 20|400|29 20 3a 20 22 22 29 3b|"; distance:0; content:"fetch|28|url|2c 20 7b 20|cache|3a 20 22|no|2d|store|22 2c 20|mode|3a 20 22|no|2d|cors|22 20 7d 29 2e|catch|28|function|20 28 29 20 7b 7d 29 3b|"; fast_pattern; classtype:exploit-kit; sid:2071921; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_09_04, deployment Perimeter, malware_family BlueMoonEK, confidence High, signature_severity Major, tag Exploit, updated_at 2026_09_04, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise; target:dest_ip;)