ET EXPLOIT Possible CVE-2015-7547 Long Response to AAAA lookup

Query · suricata

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 1c 00 01|"; within:5;
Raw source ET EXPLOIT Possible CVE-2015-7547 Long Response to AAAA lookup · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert udp any 53 -> $HOME_NET any (
    msg:"ET EXPLOIT Possible CVE-2015-7547 Long Response to AAAA 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 1c 00 01|"; within:5;
    reference:cve,2015-7547;
    classtype:attempted-user;
    sid:2022544; rev:1;
    metadata:created_at 2016_02_18, cve CVE_2015_7547, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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