alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Terse DoH Style Query (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/resolve?type="; startswith; fast_pattern; content:"&name="; distance:0; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Referer|0d 0a|"; content:!"|0d 0a|Accept"; reference:md5,dc1852f54d4e5144b3129a2294d3bc39; classtype:bad-unknown; sid:2044850; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_03_31, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_31; target:src_ip;)