ET MALWARE ELF/MooBot Mirai DDoS Variant CnC Checkin M2 (Group String Len 2+)

Query · suricata

flow:established,to_server;
dsize:<34;
content:"|33 66 99|"; depth:3;
byte_test:1,>=,2,3;
byte_test:1,<=,30,3;
byte_extract:1,4,length;
isdataat:!length,relative;
pcre:"/^[A-Za-z0-9_-]+$/Rsi";
Raw source ET MALWARE ELF/MooBot Mirai DDoS Variant CnC Checkin M2 (Group String Len 2+) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE ELF/MooBot Mirai DDoS Variant CnC Checkin M2 (Group String Len 2+)";
    flow:established,to_server;
    dsize:<34;
    content:"|33 66 99|"; depth:3;
    byte_test:1,>=,2,3;
    byte_test:1,<=,30,3;
    byte_extract:1,4,length;
    isdataat:!length,relative;
    pcre:"/^[A-Za-z0-9_-]+$/Rsi";
    reference:md5,0e4c2aa30a72fd75ef49c430fd767fa0;
    reference:url,blog.netlab.360.com/ddos-botnet-moobot-en;
    classtype:command-and-control;
    sid:2030491; rev:2;
    metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2020_07_09, deployment Perimeter, malware_family Mirai, malware_family MooBot, confidence High, signature_severity Major, updated_at 2021_07_22;
)

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