alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Grizzly Loader Style DNS Lookup M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"|2f|dns|2d|query|3f|name|3d|"; startswith; content:".cfd&type=A"; endswith; fast_pattern; http.content_type; content:"application/dns-json"; http.host; pcre:"/^(?:(1\.0\.0\.1)|(1\.1\.1\.1)|(8\.8\.8\.8))$/"; threshold:type limit,count 1,seconds 300,track by_src; classtype:misc-activity; sid:2071867; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_08_31, deployment Perimeter, deployment SSLDecrypt, malware_family GrizzlyLoader, confidence Medium, signature_severity Informational, updated_at 2026_08_31, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol_DNS; target:src_ip;)