ET SHELLCODE Possible UTF-16 %u9090 NOP SLED

Query · suricata

flow:established,to_client;
content:"%u9090%u"; nocase;
pcre:"/^[a-f0-9]{4}/Ri";
Raw source ET SHELLCODE Possible UTF-16 %u9090 NOP SLED · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET SHELLCODE Possible UTF-16 %u9090 NOP SLED";
    flow:established,to_client;
    content:"%u9090%u"; nocase;
    pcre:"/^[a-f0-9]{4}/Ri";
    reference:url,cansecwest.com/slides07/csw07-nazario.pdf;
    reference:url,www.sophos.com/security/technical-papers/malware_with_your_mocha.html;
    reference:url,www.windowsecurity.com/articles/Obfuscated-Shellcode-Part1.html;
    classtype:shellcode-detect;
    sid:2012111; rev:5;
    metadata:created_at 2010_12_28, confidence Medium, signature_severity Major, tag possible_exploitation, updated_at 2019_09_27;
)

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