Versions (3)
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Rev: 2 • Jan 3, 2014, 12:00 PMET DOS Possible NTP DDoS Multiple MON_LIST Seq 0 Response Spanning Multiple Packets IMPL 0x02
alert udp $HOME_NET 123 -> $EXTERNAL_NET any (msg:"ET DOS Possible NTP DDoS Multiple MON_LIST Seq 0 Response Spanning Multiple Packets IMPL 0x02"; content:"|00 02 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:2017920; rev:2; metadata:created_at 2014_01_03, confidence Medium, signature_severity Major, updated_at 2019_07_26;)
Jan 3, 2014, 12:00 PM
Jul 26, 2019, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-dos.rules