alert http $HOME_NET any -> any any (msg:"ET MALWARE plain-crypto-js RAT Stage 2 C2 Outbound Request"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"mozilla|2f|4|2e|0 |28|compatible|3b| msie 8|2e|0|3b| windows nt 5|2e|1|3b| trident|2f|4|2e|0|29|"; fast_pattern; http.content_type; content:"application/x-www-form-urlencoded"; http.request_body; base64_decode; base64_data; content:"|22|type|22 3a|"; pcre:"/^\s*\x22(?:(?:First|Base)Info|CmdResult)\x22\x3a/R"; reference:md5,9663665850cdd8fe12e30a671e5c4e6f; classtype:trojan-activity; sid:2068518; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_04_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag c2, updated_at 2026_04_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)