ET MALWARE ELF/Muhstik - IRC CnC Checkin

Query · suricata

flow:established,to_server;
dsize:<250;
content:"NICK|20|"; startswith;
content:"|0a|USER|20|muhstik"; distance:0;
content:"|20 3a|muhstik-"; distance:0; fast_pattern;
pcre:"/^\d+\x0a$/R";
Raw source ET MALWARE ELF/Muhstik - IRC CnC Checkin · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE ELF/Muhstik - IRC CnC Checkin";
    flow:established,to_server;
    dsize:<250;
    content:"NICK|20|"; startswith;
    content:"|0a|USER|20|muhstik"; distance:0;
    content:"|20 3a|muhstik-"; distance:0; fast_pattern;
    pcre:"/^\d+\x0a$/R";
    reference:url,unit42.paloaltonetworks.com/muhstik-botnet-attacks-tomato-routers-to-harvest-new-iot-devices/;
    classtype:command-and-control;
    sid:2029319; rev:1;
    metadata:affected_product Linux, attack_target Networking_Equipment, created_at 2020_01_23, deployment Perimeter, malware_family Muhstik, performance_impact Low, confidence High, signature_severity Major, tag IRC, updated_at 2020_01_23;
)

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