ET HUNTING SUSPICIOUS Possible automated connectivity check (www.google.com)

Query · suricata

flow:established,to_server;
threshold:type both,track by_src,count 2,seconds 10;
http.start;
content:"GET / HTTP/1.1|0d 0a|Host|3a 20|google.com|0d 0a 0d 0a|"; depth:36; endswith;
Raw source ET HUNTING SUSPICIOUS Possible automated connectivity check (www.google.com) · 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 HUNTING SUSPICIOUS Possible automated connectivity check (www.google.com)";
    flow:established,to_server;
    threshold:type both,track by_src,count 2,seconds 10;
    http.start;
    content:"GET / HTTP/1.1|0d 0a|Host|3a 20|google.com|0d 0a 0d 0a|"; depth:36; endswith;
    classtype:bad-unknown;
    sid:2018430; rev:6;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2014_04_30, deployment Perimeter, performance_impact Significant, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2024_05_06;
)

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