ET SHELLCODE Possible UTF-16 u9090 NOP SLED

Query · suricata

file_data;
flow:established,to_client;
content:"|5c|u9090|5c|"; 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";
    file_data;
    flow:established,to_client;
    content:"|5c|u9090|5c|"; 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:2017345; rev:4;
    metadata:created_at 2013_08_19, confidence Medium, signature_severity Major, tag possible_exploitation, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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