alert tls $HOME_NET any -> 195.22.26.192/26 443 (msg:"ET INFO invalid.cab domain in SNI"; flow:established,to_server; tls.sni; content:"invalid.cab"; fast_pattern; flowbits:set,ET.invalid.cab; flowbits:noalert; classtype:misc-activity; sid:2020888; rev:4; metadata:created_at 2015_04_10, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_24;)