ET SCAN LibSSH Based Frequent SSH Connections Likely BruteForce Attack

Query · suricata

flow:established,to_server;
content:"SSH-";
content:"libssh"; within:20;
threshold:type both, count 5, seconds 30, track by_src;
Raw source ET SCAN LibSSH Based Frequent SSH Connections Likely BruteForce Attack · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert ssh $EXTERNAL_NET any -> $HOME_NET 22 (
    msg:"ET SCAN LibSSH Based Frequent SSH Connections Likely BruteForce Attack";
    flow:established,to_server;
    content:"SSH-";
    content:"libssh"; within:20;
    threshold:type both, count 5, seconds 30, track by_src;
    classtype:attempted-admin;
    sid:2006546; rev:9;
    metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2019_07_26;
)

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