alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO DNS Over HTTP Style Request (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/resolve?type="; startswith; fast_pattern; content:"&short="; within:12; content:"&name="; within:10; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; reference:md5,8feb11d15b708736189779ddc51a4a0a; classtype:misc-activity; sid:2048359; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_09_29, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_27, reviewed_at 2023_09_29; target:src_ip;)