ET MALWARE ELF/Muhstik Botnet CnC Activity

Query · suricata

flow:established,to_server;
content:"NICK|20|";
content:"USER|20|";
content:"|3a|muhstik-"; fast_pattern;
pcre:"/^[0-9]{8}$/Rm";
Raw source ET MALWARE ELF/Muhstik Botnet CnC Activity · 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 -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE ELF/Muhstik Botnet CnC Activity";
    flow:established,to_server;
    content:"NICK|20|";
    content:"USER|20|";
    content:"|3a|muhstik-"; fast_pattern;
    pcre:"/^[0-9]{8}$/Rm";
    reference:md5,81fbe69a36650504b88756074a36c183;
    reference:md5,d20478a01344026a0ecd60b0b29e9bc1;
    reference:url,blog.netlab.360.com/threat-alert-log4j-vulnerability-has-been-adopted-by-two-linux-botnets/;
    classtype:command-and-control;
    sid:2034743; rev:1;
    metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2021_12_15, deployment Perimeter, malware_family Muhstik, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_15;
)

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