ET MALWARE Suspected Trojan-Proxy Web Socket Connection Activity

Query · suricata

flow:established,to_server;
urilen:6;
http.method;
content:"GET";
http.uri;
content:"/strvn"; fast_pattern;
http.header;
content:"|0d 0a|Upgrade|3a 20|websocket|0d 0a|";
http.header_names;
content:"|0d 0a|Sec-WebSocket-Version|0d 0a|Sec-WebSocket-Key|0d 0a 0d 0a|"; endswith;
target:src_ip;
Raw source ET MALWARE Suspected Trojan-Proxy Web Socket Connection Activity · 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 -> $EXTERNAL_NET 6101 (
    msg:"ET MALWARE Suspected Trojan-Proxy Web Socket Connection Activity";
    flow:established,to_server;
    urilen:6;
    http.method;
    content:"GET";
    http.uri;
    content:"/strvn"; fast_pattern;
    http.header;
    content:"|0d 0a|Upgrade|3a 20|websocket|0d 0a|";
    http.header_names;
    content:"|0d 0a|Sec-WebSocket-Version|0d 0a|Sec-WebSocket-Key|0d 0a 0d 0a|"; endswith;
    reference:md5,063d956b55da0d18f3f732c2bbd4bc28;
    reference:url,securelist.com/trojan-proxy-for-macos/111325/;
    classtype:trojan-activity;
    sid:2051982; rev:1;
    metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_04_10, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_10;
    target:src_ip;
)

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