ET MALWARE Possible Dyre DGA NXDOMAIN Responses (.hk)

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|hk|00|"; distance:37; within:4; fast_pattern;
content:"|22|"; distance:-39; within:1;
pcre:"/^[a-z][a-f0-9]{33}/Ri";
threshold:type both, track by_src, count 12, seconds 120;
Raw source ET MALWARE Possible Dyre DGA NXDOMAIN Responses (.hk) · 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 Dyre DGA NXDOMAIN Responses (.hk)";
    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|hk|00|"; distance:37; within:4; fast_pattern;
    content:"|22|"; distance:-39; within:1;
    pcre:"/^[a-z][a-f0-9]{33}/Ri";
    threshold:type both, track by_src, count 12, seconds 120;
    reference:md5,c5d2a2287424ab9508ae15261020e48d;
    classtype:trojan-activity;
    sid:2019886; rev:1;
    metadata:created_at 2014_12_08, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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