alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed PHPs Labyrinth Stage2 CnC Domain in TLS SNI"; flow:established,to_server; tls.sni; content:"medsource.top"; bsize:13; reference:url,blog.prevailion.com/2020/02/phps-labyrinth-weaponized-wordpress.html; classtype:domain-c2; sid:2029517; rev:1; metadata:affected_product Wordpress_Plugins, attack_target Web_Server, created_at 2020_02_20, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2020_02_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)