alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED TA404/Zinc Trojanized muPDF/Subliminal CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:20; content:"/support/support.asp"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; http.request_body; content:"bbs="; content:"article="; reference:url,www.microsoft.com/security/blog/2022/09/29/zinc-weaponizing-open-source-software/; classtype:trojan-activity; sid:2039076; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_09_30, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_18, reviewed_at 2024_09_18;)