ET MALWARE Suspected Kimsuky Activity (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php"; endswith;
http.user_agent;
content:!"Linux";
content:!"Android";
http.request_body;
content:"page="; startswith; fast_pattern;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET MALWARE Suspected Kimsuky Activity (POST) · Suricata
Esc
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Suspected Kimsuky Activity (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.user_agent;
    content:!"Linux";
    content:!"Android";
    http.request_body;
    content:"page="; startswith; fast_pattern;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    http.header_names;
    content:!"Referer";
    reference:md5,4480e09dbc1514f231ee86110a649965;
    reference:url,twitter.com/StopMalvertisin/status/1669379332547186690;
    classtype:trojan-activity;
    sid:2046617; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_06_22, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_22;
    target:src_ip;
)

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