ET SCAN SSH BruteForce Tool with fake PUTTY version

Query · suricata

flow:established,to_server;
ssh_proto;
content:"PUTTY";
threshold:type limit, track by_src, count 1, seconds 30;
Raw source ET SCAN SSH BruteForce Tool with fake PUTTY version · 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 ssh $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET SCAN SSH BruteForce Tool with fake PUTTY version";
    flow:established,to_server;
    ssh_proto;
    content:"PUTTY";
    threshold:type limit, track by_src, count 1, seconds 30;
    classtype:network-scan;
    sid:2019876; rev:6;
    metadata:created_at 2014_12_05, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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