alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ThreatFox botnet C2 traffic (url - confidence level: 100%)"; flow:established,from_client; http.method; content:"GET"; http.uri; content:"/ws"; depth:3; nocase; http.host; content:"cdnjs.bootstrapscdn.com"; depth:23; isdataat:!1,relative; reference:url, threatfox.abuse.ch/ioc/1821970/; target:src_ip; metadata:confidence_level 100, first_seen 2026_06_03; classtype:trojan-activity; sid:91821970; rev:1;)