ET MALWARE Win32.Hyteod.acox Domain Generation Algorithm (DGA) Lookup NXDOMAIN Response

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|ru|00|"; distance:53; within:4;
content:"|32|"; distance:-55; within:1;
pcre:"/^[a-z0-9]{50}/R";
threshold:type both, track by_src, count 3, seconds 60;
Raw source ET MALWARE Win32.Hyteod.acox Domain Generation Algorithm (DGA) Lookup NXDOMAIN Response · 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 Win32.Hyteod.acox Domain Generation Algorithm (DGA) Lookup NXDOMAIN Response";
    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|ru|00|"; distance:53; within:4;
    content:"|32|"; distance:-55; within:1;
    pcre:"/^[a-z0-9]{50}/R";
    threshold:type both, track by_src, count 3, seconds 60;
    classtype:trojan-activity;
    sid:2020742; rev:1;
    metadata:created_at 2015_03_25, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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