Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Stealc Submitting System Information to C2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"form-data|3b 20|name=|22|token|22|"; content:"form-data|3b 20|name=|22|file|22 0d 0a 0d 0a|"; fast_pattern; distance:0; base64_decode:offset 0,relative; base64_data; content:"|0a|Network|20|Info|3a 0a 09|"; startswith; content:"|0a 09 2d 20|OS|3a|"; content:"|0a 09 2d 20|Keyboards|3a|"; reference:url,blog.sekoia.io/stealc-a-copycat-of-vidar-and-raccoon-infostealers-gaining-in-popularity-part-1/; classtype:command-and-control; sid:2044248; 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;)