ET MALWARE DeerStealer Websocket Initial Request

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri; bsize:2;
content:"/c";
http.header_names;
content:"|0d 0a|host|0d 0a|upgrade|0d 0a|connection|0d 0a|sec-websocket-version|0d 0a|sec-websocket-key|0d 0a 0d 0a|"; fast_pattern; nocase;
http.header;
content:!"user-agent|3a 20|"; nocase;
target:src_ip;
Raw source ET MALWARE DeerStealer Websocket Initial Request · 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 $HOME_NET any -> any any (
    msg:"ET MALWARE DeerStealer Websocket Initial Request";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:2;
    content:"/c";
    http.header_names;
    content:"|0d 0a|host|0d 0a|upgrade|0d 0a|connection|0d 0a|sec-websocket-version|0d 0a|sec-websocket-key|0d 0a 0d 0a|"; fast_pattern; nocase;
    http.header;
    content:!"user-agent|3a 20|"; nocase;
    reference:url,any.run/cybersecurity-blog/deerstealer-campaign-analysis/;
    classtype:trojan-activity;
    sid:2061600; rev:1;
    metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2025_04_15, deployment Perimeter, signature_severity Major, updated_at 2025_04_15;
    target:src_ip;
)

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