alert udp any 53 -> $HOME_NET any (msg:"ET EXPLOIT Possible CVE-2015-7547 Long Response to A lookup"; flow:from_server; content:"|00 01|"; offset:4; depth:2; isdataat:2049; byte_test:1,&,128,2; byte_test:1,!&,64,2; byte_test:1,!&,32,2; byte_test:1,!&,16,2; byte_test:1,!&,8,2; byte_test:1,&,2,2; byte_test:1,!&,1,3; byte_test:1,!&,2,3; byte_test:1,!&,4,3; byte_test:1,!&,8,3; pcre:"/^.{6}[^\x00]+/Rs"; content:"|00 00 01 00 01|"; within:5; reference:cve,2015-7547; classtype:attempted-user; sid:2022543; rev:1; metadata:created_at 2016_02_18, cve CVE_2015_7547, confidence Medium, signature_severity Major, updated_at 2019_07_26;)