alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (PHPs Labyrinth Stage1 CnC)"; flow:established,to_client; tls.cert_subject; bsize:17; content:"CN=www."; startswith; content:"rilns.com"; endswith; fast_pattern; reference:url,blog.prevailion.com/2020/02/phps-labyrinth-weaponized-wordpress.html; classtype:domain-c2; sid:2029522; rev:1; metadata:affected_product Wordpress_Plugins, attack_target Client_and_Server, created_at 2020_02_20, deployment Perimeter, deployment Datacenter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, 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;)