ET SCAN Rapid IMAP Connections - Possible Brute Force Attack

Query · suricata

flow:to_server;
flags:S,12;
threshold:type both, track by_src, count 30, seconds 60;
Raw source ET SCAN Rapid IMAP Connections - Possible Brute Force Attack · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (
    msg:"ET SCAN Rapid IMAP Connections - Possible Brute Force Attack";
    flow:to_server;
    flags:S,12;
    threshold:type both, track by_src, count 30, seconds 60;
    classtype:misc-activity;
    sid:2002994; rev:7;
    metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2019_07_26;
)

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