ET MALWARE Suspected PrivateLoader Activity (POST)

Query · suricata

flow:established,to_server;
urilen:<20;
http.method;
content:"POST";
http.uri;
content:"/api/f"; startswith; fast_pattern;
content:".php"; endswith;
http.request_body;
content:"data="; startswith;
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET MALWARE Suspected PrivateLoader 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Suspected PrivateLoader Activity (POST)";
    flow:established,to_server;
    urilen:<20;
    http.method;
    content:"POST";
    http.uri;
    content:"/api/f"; startswith; fast_pattern;
    content:".php"; endswith;
    http.request_body;
    content:"data="; startswith;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    http.header_names;
    content:!"Referer";
    reference:md5,60de759615308e91b93a6a9e2123099c;
    reference:md5,7c265e37c82f68ad7ef9d6ca88d245af;
    reference:md5,7b81b2c0c7fec00ff9bdeae73d8b997e;
    classtype:trojan-activity;
    sid:2049837; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_12_26, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_26;
    target:src_ip;
)

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