Versions (2)
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Rev: 1 • Oct 23, 2025, 12:00 PMET PHISHING Observed TyKit Domain (segy2 .cc in TLS SNI)
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Observed TyKit Domain (segy2 .cc in TLS SNI)"; flow:established,to_server; tls.sni; bsize:8; content:"segy2.cc"; fast_pattern; reference:url,any.run/cybersecurity-blog/tykit-technical-analysis/; classtype:social-engineering; sid:2065375; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_10_23, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Phishing, tag Description_Generated_By_Proofpoint_Nexus, tag Tykit, updated_at 2025_10_23, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)
Oct 23, 2025, 12:00 PM
Oct 23, 2025, 12:00 PM
Oct 24, 2025, 9:34 PM
Oct 27, 2025, 10:34 PM
rules/emerging-phishing.rules