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:"/api"; depth:4; nocase; http.host; content:"00491751076163.com"; depth:18; isdataat:!1,relative; reference:url, threatfox.abuse.ch/ioc/1735685/; target:src_ip; metadata:confidence_level 100, first_seen 2026_01_22; classtype:trojan-activity; sid:91735685; rev:1;)