ET HUNTING curl User-Agent to Dotted Quad

Query · suricata

flow:established,to_server;
http.user_agent;
content:"curl/"; startswith; nocase; fast_pattern;
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
Raw source ET HUNTING curl User-Agent to Dotted Quad · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING curl User-Agent to Dotted Quad";
    flow:established,to_server;
    http.user_agent;
    content:"curl/"; startswith; nocase; fast_pattern;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/";
    classtype:bad-unknown;
    sid:2034567; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_12_01, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_01;
)

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