ET MALWARE JS/Z1_Loader Activity (POST)

Query · suricata

flow:established,to_server;
urilen:1;
http.method;
content:"POST";
http.request_body;
content:"id=1"; fast_pattern; bsize:4;
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
http.header_names;
content:"|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|Accept-Encoding|0d 0a|"; startswith;
content:!"Referer";
target:src_ip;
Raw source ET MALWARE JS/Z1_Loader Activity (POST) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE JS/Z1_Loader Activity (POST)";
    flow:established,to_server;
    urilen:1;
    http.method;
    content:"POST";
    http.request_body;
    content:"id=1"; fast_pattern; bsize:4;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:"|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|Accept-Encoding|0d 0a|"; startswith;
    content:!"Referer";
    reference:md5,1740dd861c10c370aded27ff14fa8425;
    classtype:trojan-activity;
    sid:2049086; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_11_06, deployment Perimeter, malware_family JS_Z1_Loader, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_06, reviewed_at 2023_11_06;
    target:src_ip;
)

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