ET MALWARE Group 21 Payload CnC Checkin

Query · suricata

flow:established,to_server;
dsize:<400;
content:"|3a 3a|MAC|3a 3a|"; startswith;
content:"|3a 3a|HOSTNAME/USERNAME|3a 3a|"; within:100; fast_pattern;
content:"|3a 3a|U-FILE|3a 3a|"; within:100;
Raw source ET MALWARE Group 21 Payload CnC Checkin · 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 tcp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Group 21 Payload CnC Checkin";
    flow:established,to_server;
    dsize:<400;
    content:"|3a 3a|MAC|3a 3a|"; startswith;
    content:"|3a 3a|HOSTNAME/USERNAME|3a 3a|"; within:100; fast_pattern;
    content:"|3a 3a|U-FILE|3a 3a|"; within:100;
    reference:md5,6a271282fe97322d49e9692891332ad7;
    classtype:trojan-activity;
    sid:2035061; rev:3;
    metadata:created_at 2020_01_16, confidence High, signature_severity Major, updated_at 2020_08_19;
)

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