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

Query · suricata

flow:established,to_server;
dsize:38;
content:"GET / HTTP/1.";
content:"|0d 0a|Host|3a 20|www.bing.com|0d 0a 0d 0a|"; distance:1; within:24; fast_pattern;
threshold:type limit, count 1, seconds 300, track by_src;
Raw source ET HUNTING SUSPICIOUS Possible automated connectivity check (www.bing.com) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $HOME_NET any -> $EXTERNAL_NET 80 (
    msg:"ET HUNTING SUSPICIOUS Possible automated connectivity check (www.bing.com)";
    flow:established,to_server;
    dsize:38;
    content:"GET / HTTP/1.";
    content:"|0d 0a|Host|3a 20|www.bing.com|0d 0a 0d 0a|"; distance:1; within:24; fast_pattern;
    threshold:type limit, count 1, seconds 300, track by_src;
    classtype:bad-unknown;
    sid:2018432; rev:3;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2014_04_30, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2024_04_30, reviewed_at 2024_03_06;
)

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