ET MALWARE IRC DNS request on non-standard port

Query · suricata

flow:to_server,established;
content:"USERHOST "; nocase; depth:9;
Raw source ET MALWARE IRC DNS request on non-standard port · 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 $HOME_NET any -> $EXTERNAL_NET !6661:6668 (
    msg:"ET MALWARE IRC DNS request on non-standard port";
    flow:to_server,established;
    content:"USERHOST "; nocase; depth:9;
    classtype:policy-violation;
    sid:2000352; rev:10;
    metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, reviewed_at 2024_09_16;
)

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