alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Cobalt Strike Domain (zuyonijobo .com) in TLS SNI"; flow:established,to_server; tls.sni; content:"zuyonijobo.com"; bsize:14; fast_pattern; reference:url,isc.sans.edu/diary/rss/28884; classtype:domain-c2; sid:2037843; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_28, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_17, reviewed_at 2024_09_17;)