ET POLICY Outbound Multiple Non-SMTP Server Emails

Query · suricata

flow:established;
content:"mail from|3a|"; nocase;
threshold:type threshold, track by_src, count 10, seconds 120;
Raw source ET POLICY Outbound Multiple Non-SMTP Server Emails · 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 tcp !$SMTP_SERVERS any -> !$HOME_NET 25 (
    msg:"ET POLICY Outbound Multiple Non-SMTP Server Emails";
    flow:established;
    content:"mail from|3a|"; nocase;
    threshold:type threshold, track by_src, count 10, seconds 120;
    classtype:misc-activity;
    sid:2000328; rev:12;
    metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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