alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Trickbot Data Exfiltration M4"; flow:established,to_server; http.method; content:"POST"; http.content_type; content:"multipart/form-data|3b 20|boundary=---------"; startswith; bsize:55; pcre:"/^[A-Z]{16}$/R"; http.request_body; content:"|0d 0a|Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|formdata|22 0d 0a 0d 0a 7b|"; content:"|0d 0a|Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|billinfo|22 0d 0a 0d 0a 7b|"; distance:0; content:"|0d 0a|Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|cardinfo|22 0d 0a 0d 0a 7b|"; distance:0; fast_pattern; reference:url,www.malware-traffic-analysis.net/2021/09/01/index.html; classtype:command-and-control; sid:2035358; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_01, deployment Perimeter, malware_family TrickBot, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_19;)