ET HUNTING GENERIC SUSPICIOUS POST to Dotted Quad with Fake Browser 2

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.user_agent;
content:"|20|Firefox/"; nocase; fast_pattern;
http.host;
pcre:"/^(?:\d{1,3}\.){3}\d{1,3}/";
http.header_names;
content:"|0d 0a|Host|0d 0a|"; depth:8;
content:!"Accept-Encoding";
content:!"Referer";
content:!"X-Requested-With"; nocase;
Raw source ET HUNTING GENERIC SUSPICIOUS POST to Dotted Quad with Fake Browser 2 · 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 HUNTING GENERIC SUSPICIOUS POST to Dotted Quad with Fake Browser 2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.user_agent;
    content:"|20|Firefox/"; nocase; fast_pattern;
    http.host;
    pcre:"/^(?:\d{1,3}\.){3}\d{1,3}/";
    http.header_names;
    content:"|0d 0a|Host|0d 0a|"; depth:8;
    content:!"Accept-Encoding";
    content:!"Referer";
    content:!"X-Requested-With"; nocase;
    classtype:bad-unknown;
    sid:2018359; rev:5;
    metadata:created_at 2014_04_04, performance_impact Significant, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_06;
)

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