alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ThreatFox botnet C2 traffic (url - confidence level: 75%)"; flow:established,from_client; http.method; content:"GET"; http.uri; content:"/api"; depth:4; nocase; http.host; content:"retiriu.cyou"; depth:12; isdataat:!1,relative; reference:url, threatfox.abuse.ch/ioc/1761082/; target:src_ip; metadata:confidence_level 75, first_seen 2026_03_07; classtype:trojan-activity; sid:91761082; rev:1;)