alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Fake Browser Update Domain in TLS SNI (donnows .com)"; flow:established,to_server; tls.sni; bsize:11; content:"donnows.com"; fast_pattern; reference:url,infosec.exchange/@GustyDusty/111176105257032772; classtype:exploit-kit; sid:2050983; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2024_02_20, deployment Perimeter, deprecation_reason Relevance, performance_impact Low, confidence High, signature_severity Minor, tag Exploit_Kit, tag compromised_website, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_25, reviewed_at 2024_04_25;)