alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Turla Domain (vision2030 .tk in TLS SNI)"; flow:established,to_server; tls.sni; content:"vision2030.tk"; endswith; reference:url,www.symantec.com/blogs/threat-intelligence/waterbug-espionage-governments; classtype:targeted-activity; sid:2027501; rev:4; metadata:attack_target Client_Endpoint, created_at 2019_06_20, deployment Perimeter, malware_family Turla, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)