alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed request to common DOH pattern in URI M1"; flow:established,to_server; http.uri; content:"|2f|dns-query"; endswith; http.content_type; content:"application|2f|dns-message"; fast_pattern; classtype:misc-activity; sid:2065868; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Linux, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_21, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_21; target:src_ip;)