alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ThreatFox botnet C2 traffic (url - confidence level: 50%)"; flow:established,from_client; http.method; content:"GET"; http.uri; content:"/2000/xmlns/"; depth:12; nocase; http.host; content:"www.w3.org"; depth:10; isdataat:!1,relative; reference:url, threatfox.abuse.ch/ioc/1751991/; target:src_ip; metadata:confidence_level 50, first_seen 2026_02_21; classtype:trojan-activity; sid:91751991; rev:1;)