ET SCAN Acunetix Accept HTTP Header detected scan in progress

Query · suricata

flow:established,to_server;
threshold:type limit, count 1, seconds 60, track by_src;
http.header;
content:"Accept|3a 20|acunetix";
Raw source ET SCAN Acunetix Accept HTTP Header detected scan in progress · 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET SCAN Acunetix Accept HTTP Header detected scan in progress";
    flow:established,to_server;
    threshold:type limit, count 1, seconds 60, track by_src;
    http.header;
    content:"Accept|3a 20|acunetix";
    reference:url,www.acunetix.com/;
    classtype:attempted-recon;
    sid:2019963; rev:3;
    metadata:created_at 2014_12_18, confidence Medium, signature_severity Informational, updated_at 2020_05_14;
)

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