alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT BlueMoon EK CnC Beacon Outbound (phase)"; flow:established,to_server; http.uri; content:"/phase|3f|msg|3d|"; fast_pattern; pcre:"/^.{,400}$/R"; http.method; content:"GET"; classtype:exploit-kit; sid:2071924; 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 c2, updated_at 2026_09_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)