alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO TRR DNS over HTTPS detected"; flow:established,to_server; http.header; content:"application/dns-udpwireformat"; reference:url,tools.ietf.org/html/draft-ietf-doh-dns-over-https-02; classtype:misc-activity; sid:2025980; rev:3; metadata:tls_state TLSDecrypt, created_at 2018_08_07, deployment Perimeter, confidence High, signature_severity Informational, tag DoH, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_02;)