ET MALWARE Possible Emotet DGA NXDOMAIN Responses

Query · suricata

byte_test:1,&,128,2;
byte_test:1,&,1,3;
byte_test:1,&,2,3;
content:"|00 01 00 00 00 01|"; offset:4; depth:6;
content:"|02|eu|00|"; distance:19; within:4; fast_pattern;
content:"|10|"; distance:-21; within:1;
pcre:"/^[a-z]{16}/R";
threshold:type both, track by_src, count 12, seconds 120;
Raw source ET MALWARE Possible Emotet DGA NXDOMAIN Responses · 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 udp any 53 -> $HOME_NET any (
    msg:"ET MALWARE Possible Emotet DGA NXDOMAIN Responses";
    byte_test:1,&,128,2;
    byte_test:1,&,1,3;
    byte_test:1,&,2,3;
    content:"|00 01 00 00 00 01|"; offset:4; depth:6;
    content:"|02|eu|00|"; distance:19; within:4; fast_pattern;
    content:"|10|"; distance:-21; within:1;
    pcre:"/^[a-z]{16}/R";
    threshold:type both, track by_src, count 12, seconds 120;
    reference:md5,3083b68cb5c2a345972a5f79e735c7b9;
    classtype:trojan-activity;
    sid:2019692; rev:1;
    metadata:created_at 2014_11_12, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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