alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT TA569 Keitaro TDS Domain in TLS SNI (asyncfunctionapi .com)"; flow:established,to_server; tls.sni; bsize:20; content:"asyncfunctionapi.com"; fast_pattern; classtype:exploit-kit; sid:2051095; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2024_02_26, deployment Perimeter, deprecation_reason Relevance, performance_impact Low, confidence High, signature_severity Minor, tag Exploit_Kit, tag ta569, tag TDS, tag compromised_website, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_09, reviewed_at 2024_08_09;)