ET DOS Likely NTP DDoS In Progress Multiple UNSETTRAP Mode 6 Responses

Query · suricata

content:"|df 00 00 04 00|"; offset:1; depth:5;
byte_test:1,!&,128,0;
byte_test:1,!&,64,0;
byte_test:1,&,4,0;
byte_test:1,&,2,0;
byte_test:1,!&,1,0;
threshold:type both,track by_src,count 2,seconds 60;
Raw source ET DOS Likely NTP DDoS In Progress Multiple UNSETTRAP Mode 6 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 123 -> any any (
    msg:"ET DOS Likely NTP DDoS In Progress Multiple UNSETTRAP Mode 6 Responses";
    content:"|df 00 00 04 00|"; offset:1; depth:5;
    byte_test:1,!&,128,0;
    byte_test:1,!&,64,0;
    byte_test:1,&,4,0;
    byte_test:1,&,2,0;
    byte_test:1,!&,1,0;
    threshold:type both,track by_src,count 2,seconds 60;
    reference:url,community.rapid7.com/community/metasploit/blog/2014/08/25/r7-2014-12-more-amplification-vulnerabilities-in-ntp-allow-even-more-drdos-attacks;
    classtype:attempted-dos;
    sid:2019022; rev:4;
    metadata:created_at 2014_08_26, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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