alert udp any 53 -> $HOME_NET any (msg:"ET RETIRED Possible 2015-7547 Malformed Server response"; flow:from_server; content:"|00 01 00 00 00 00 00 00|"; offset:4; depth:8; 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:"/^[^\x00]+\x00\x00\x01/R"; reference:cve,2015-7547; classtype:attempted-user; sid:2022531; rev:2; metadata:created_at 2016_02_17, cve CVE_2015_7547, former_category EXPLOIT, confidence Medium, signature_severity Major, updated_at 2026_07_30;)