ET SCAN Grendel Web Scan - Default User Agent Detected

Query · suricata

flow:to_server,established;
threshold:type limit, track by_dst, count 1, seconds 60;
http.header;
content:"http|3a|//www.grendel-scan.com"; nocase;
http.user_agent;
content:"Mozilla/5.0 (compatible|3b 20|Grendel-Scan"; nocase; depth:37; fast_pattern;
Raw source ET SCAN Grendel Web Scan - Default User Agent Detected · 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 -> $HTTP_SERVERS any (
    msg:"ET SCAN Grendel Web Scan - Default User Agent Detected";
    flow:to_server,established;
    threshold:type limit, track by_dst, count 1, seconds 60;
    http.header;
    content:"http|3a|//www.grendel-scan.com"; nocase;
    http.user_agent;
    content:"Mozilla/5.0 (compatible|3b 20|Grendel-Scan"; nocase; depth:37; fast_pattern;
    reference:url,www.grendel-scan.com;
    classtype:attempted-recon;
    sid:2009480; rev:10;
    metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2020_10_14;
)

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