Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Ordns DNS over HTTPS Domain (Ordns .he .net in TLS SNI)"; flow:established,to_server; threshold: type both, track by_src, count 1, seconds 600; tls.sni; content:"ordns.he.net"; endswith; reference:url,www.blackhillsinfosec.com/dns-over-https-for-cobalt-strike; classtype:misc-activity; sid:2035858; rev:2; metadata:created_at 2022_04_07, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_07;)