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Rev: 1 • Mar 25, 2015, 12:00 PMET MALWARE Win32.Hyteod.acox Domain Generation Algorithm (DGA) Lookup NXDOMAIN Response
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;)
Mar 25, 2015, 12:00 PM
Jul 26, 2019, 12:00 PM
Sep 21, 2024, 3:00 AM
Nov 10, 2025, 10:34 PM
rules/emerging-malware.rules