ET DOS Possible NTP DDoS Multiple MON_LIST Seq 0 Response Spanning Multiple Packets IMPL 0x03

Query · suricata

content:"|00 03 2a|"; offset:1; depth:3;
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 Possible NTP DDoS Multiple MON_LIST Seq 0 Response Spanning Multiple Packets IMPL 0x03 · 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 $HOME_NET 123 -> $EXTERNAL_NET any (
    msg:"ET DOS Possible NTP DDoS Multiple MON_LIST Seq 0 Response Spanning Multiple Packets IMPL 0x03";
    content:"|00 03 2a|"; offset:1; depth:3;
    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,www.symantec.com/connect/blogs/hackers-spend-christmas-break-launching-large-scale-ntp-reflection-attacks;
    classtype:attempted-dos;
    sid:2017921; rev:2;
    metadata:created_at 2014_01_03, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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