alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING TyKit CnC Request M2 2025-10-23"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:14; content:"/api/validate/"; fast_pattern; http.request_body; content:"|7b 22|key|22|"; startswith; content:"|22|redirect|22|"; distance:0; content:".php"; distance:0; content:"|22|token|22|"; distance:0; content:"|22|server|22|"; distance:0; content:"|22|email|22|"; distance:0; reference:url,any.run/cybersecurity-blog/tykit-technical-analysis/; classtype:social-engineering; sid:2065377; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_10_23, deployment Perimeter, confidence Medium, signature_severity Major, tag Phishing, tag Description_Generated_By_Proofpoint_Nexus, tag Tykit, updated_at 2025_10_23;)