ET MALWARE Win32/FireStealer Related Server Response

Query · suricata

flow:established,to_client;
http.stat_code;
content:"200";
http.server;
content:"nginx"; bsize:5;
http.content_type;
content:"application/json|3b 20|charset=utf-8"; bsize:31;
file.data;
content:"|7b 22|status|22 3a 20 22|Success|22 2c 20 22|k|22 3a 20 22|"; startswith; fast_pattern;
content:"|22 2c 20 22|c|22 3a 20|"; distance:0;
target:dest_ip;
Raw source ET MALWARE Win32/FireStealer Related Server Response · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Win32/FireStealer Related Server Response";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.server;
    content:"nginx"; bsize:5;
    http.content_type;
    content:"application/json|3b 20|charset=utf-8"; bsize:31;
    file.data;
    content:"|7b 22|status|22 3a 20 22|Success|22 2c 20 22|k|22 3a 20 22|"; startswith; fast_pattern;
    content:"|22 2c 20 22|c|22 3a 20|"; distance:0;
    reference:md5,03f80949b6a0d5148c4e0d0557175131;
    classtype:trojan-activity;
    sid:2051909; rev:1;
    metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2024_04_03, deployment Perimeter, malware_family Win32_FireStealer, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03;
    target:dest_ip;
)

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