alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [SEKOIA.IO] Win32/Stealc C2 Check-in"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; pcre:"/^\/\w+\.php$/"; http.content_type; content:"multipart/form-data|3b 20|boundary=----"; http.request_body; content:"form-data|3b 20|name=|22|hwid|22|"; fast_pattern; content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|build|22|"; distance:0; reference:url,blog.sekoia.io/stealc-a-copycat-of-vidar-and-raccoon-infostealers-gaining-in-popularity-part-1/; classtype:command-and-control; sid:2044243; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_20, deployment Perimeter, malware_family Stealc, confidence High, signature_severity Major, tag Stealer, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_20;)