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:"/nback.php"; depth:10; nocase; http.host; content:"eroticaforfree.com"; depth:18; isdataat:!1,relative; reference:url, threatfox.abuse.ch/ioc/1752584/; target:src_ip; metadata:confidence_level 100, first_seen 2026_02_22; classtype:trojan-activity; sid:91752584; rev:1;)