ET MALWARE LinuxNet.perlbot Checkin Via IRC

Query · suricata

flow:to_server,established;
content:"NICK|20 7c|GNU|7c 0a|"; depth:12; fast_pattern;
content:"USER|20|GNU|20|"; within:9;
pcre:"/(?:\d{1,3}\.){3}\d{1,3} (?:\d{1,3}\.){3}\d{1,3} \x3a(?:Linux|FreeBSD|SunOS)/R";
content:"|0a|JOIN|20|"; distance:0;
Raw source ET MALWARE LinuxNet.perlbot Checkin Via IRC · 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 http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE LinuxNet.perlbot Checkin Via IRC";
    flow:to_server,established;
    content:"NICK|20 7c|GNU|7c 0a|"; depth:12; fast_pattern;
    content:"USER|20|GNU|20|"; within:9;
    pcre:"/(?:\d{1,3}\.){3}\d{1,3} (?:\d{1,3}\.){3}\d{1,3} \x3a(?:Linux|FreeBSD|SunOS)/R";
    content:"|0a|JOIN|20|"; distance:0;
    classtype:command-and-control;
    sid:2019921; rev:3;
    metadata:created_at 2014_12_11, signature_severity Major, updated_at 2020_08_19;
)

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