alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Operation Mystery Baby syschk CnC Communication"; flow:established,to_server; http.method; content:"POST"; http.content_type; content:"multipart / form-data|3b 20|boundary = -------- 1650502037"; fast_pattern; endswith; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,blog.alyac.co.kr/m/1963; classtype:command-and-control; sid:2026614; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_11_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_04_21;)