ET MALWARE [SEKOIA.IO] Win32/Stealc C2 Check-in

Query · suricata

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;
Raw source ET MALWARE [SEKOIA.IO] Win32/Stealc C2 Check-in · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
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;
)

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