alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Fake Browser Update Domain in TLS SNI (cheetahsnv .com)"; flow:established,to_server; tls.sni; bsize:14; content:"cheetahsnv.com"; fast_pattern; reference:url,www.trellix.com/en-us/about/newsroom/stories/research/new-techniques-of-fake-browser-updates.html; classtype:exploit-kit; sid:2047677; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_08_18, deployment Perimeter, deprecation_reason Age, performance_impact Low, confidence High, signature_severity Major, tag Exploit_Kit, tag compromised_website, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_03, reviewed_at 2023_10_03;)