ET MALWARE Suspected Malicious JS Loader Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
pcre:"/^\/[a-z]{8,12}$/";
http.user_agent;
content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern; bsize:57;
http.header_names;
content:!"Referer";
target:src_ip;
target:src_ip;
Raw source ET MALWARE Suspected Malicious JS Loader Activity (GET) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Suspected Malicious JS Loader Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    pcre:"/^\/[a-z]{8,12}$/";
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern; bsize:57;
    http.header_names;
    content:!"Referer";
    target:src_ip;
    reference:md5,93419e7818759ebd01e65a84f4c6535d;
    classtype:trojan-activity;
    sid:2049263; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2023_11_20, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_31;
    target:src_ip;
)

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