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:"/"; depth:1; nocase; http.host; content:"secure-signal.info"; depth:18; isdataat:!1,relative; reference:url, threatfox.abuse.ch/ioc/1692723/; target:src_ip; metadata:confidence_level 100, first_seen 2026_01_08; classtype:trojan-activity; sid:91692723; rev:1;)