ET HUNTING SUSPICIOUS IRC - NICK and 3 Letter Country Code

Query · suricata

flow:established,to_server;
content:"NICK "; depth:5;
pcre:"/^[^\r\n]*[\[\|\{][A-Z]{3}[\]\|\}]/R";
Raw source ET HUNTING SUSPICIOUS IRC - NICK and 3 Letter Country Code · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING SUSPICIOUS IRC - NICK and 3 Letter Country Code";
    flow:established,to_server;
    content:"NICK "; depth:5;
    pcre:"/^[^\r\n]*[\[\|\{][A-Z]{3}[\]\|\}]/R";
    classtype:bad-unknown;
    sid:2017319; rev:6;
    metadata:created_at 2013_08_13, confidence Medium, signature_severity Informational, updated_at 2019_07_26;
)

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