ET INFO Plaintext SSH Authentication Identified (Encryption set to None)

Query · suricata

flow:established,to_server;
content:"|00 00 00|";
content:"|00 00 00|"; within:50;
content:"|0e|ssh-connection|00 00 00 08|password|00 00 00 00|"; within:31;
content:"|00 00 00 00 00 00 00 00 00|"; distance:0;
Raw source ET INFO Plaintext SSH Authentication Identified (Encryption set to None) · 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 -> any 22 (
    msg:"ET INFO Plaintext SSH Authentication Identified (Encryption set to None)";
    flow:established,to_server;
    content:"|00 00 00|";
    content:"|00 00 00|"; within:50;
    content:"|0e|ssh-connection|00 00 00 08|password|00 00 00 00|"; within:31;
    content:"|00 00 00 00 00 00 00 00 00|"; distance:0;
    reference:url,hamwan.org/Standards/Network%20Engineering/Authentication/SSH%20Without%20Encryption.html;
    classtype:misc-activity;
    sid:2026643; rev:4;
    metadata:attack_target Client_and_Server, created_at 2018_11_21, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_04_24;
)

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