alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE nspx30 Orchestrator CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/id|3d|"; startswith; pcre:"/^[a-f0-9]{32}/R"; content:"ad|3d|"; pcre:"/^\d{2}/R"; content:"os|3d|"; pcre:"/^\d{1,3}\x2e\d{1,3}/R"; content:"t|3d|"; pcre:"/^\d/R"; http.host; content:"www.baidu.com"; http.user_agent; content:"Mozilla/4.0 |28|compatible|3b|MSIE 5.0|3b 20|Windows 98|29|"; reference:url,www.welivesecurity.com/en/eset-research/nspx30-sophisticated-aitm-enabled-implant-evolving-since-2005/; classtype:trojan-activity; sid:2050498; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_01_25, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_01_25; target:src_ip;)