alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed upStage Payload Delivery Domain (7zip .cloud) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".7zip.cloud"; endswith; fast_pattern; reference:url,blog.lukeacha.com/2026/01/beware-of-fake-7zip-installer-upstage.html; classtype:social-engineering; sid:2067629; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2026_02_11, deployment Perimeter, malware_family upStage, performance_impact Low, confidence High, signature_severity Major, updated_at 2026_02_11, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1102, mitre_technique_name Web_Service;)