alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING TA444 Domain in TLS SNI (pdf .cisco-webex .online)"; flow:established,to_server; tls.sni; dotprefix; content:".pdf.cisco-webex.online"; endswith; fast_pattern; reference:url,twitter.com/SlowMist_Team/status/1732311816557269067; classtype:social-engineering; sid:2049602; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_12_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag TA444, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_06, reviewed_at 2024_08_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)