alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky/TA406 Payload Request (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"|2e|php|3f|uid|3d|"; content:"&key="; distance:0; http.header_names; bsize:84; content:"|0d 0a|accept|0d 0a|accept-language|0d 0a|ua-cpu|0d 0a|accept-encoding|0d 0a|user-agent|0d 0a|host|0d 0a|connection|0d 0a 0d 0a|"; nocase; fast_pattern; http.accept_enc; content:"gzip|2c 20|deflate"; reference:url,x.com/naumovax/status/1965055436039839952; reference:md5,6d18166da354efacd541bcac622a6e43; classtype:trojan-activity; sid:2064452; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_09_08, deployment Perimeter, malware_family Kimsuky, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, tag TA406, updated_at 2025_09_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:src_ip;)