alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Mocelpa Client Hello CnC Beacon"; flow:established,to_server; content:"|54 b4 c9 7b|"; fast_pattern; tls.sni; bsize:13; content:"www.apple.com"; reference:url,blog.dragonthreatlabs.com/2015/07/dtl-06282015-01-apt-on-taiwan-insight.html; classtype:command-and-control; sid:2021379; rev:3; metadata:attack_target Client_Endpoint, created_at 2015_07_06, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_04_25, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)