alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA416 PlugX CnC Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:>90; pcre:"/^\x2f(?:[a-zA-Z0-9]{2,20}\x3f)|(?:[a-zA-Z0-9]{4}\x3d)/"; http.user_agent; bsize:1; content:"M"; http.cookie; pcre:"/^(?:[a-zA-Z0-9]{1,12}\x3d)/"; content:"|3b|token="; distance:0; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; http.header; content:"User|2d|Agent|3a 20|M|0d 0a|"; fast_pattern; classtype:command-and-control; sid:2068413; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_01_05, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Critical, tag c2, tag TA416, updated_at 2026_03_25, former_sid 2865578, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)