ET SHELLCODE Possible Unescape Encoded Content With Split String Obfuscation

Query · suricata

flow:established,to_client;
content:"unescape|28 22|";
content:!"|29|"; within:100;
content:"|22| +|0a|"; within:80;
content:"|22| +|0a|"; within:80;
content:"|22| "; within:80;
content:"|22| +|0a|"; within:80;
Raw source ET SHELLCODE Possible Unescape Encoded Content With Split String Obfuscation · 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 Unescape Encoded Content With Split String Obfuscation";
    flow:established,to_client;
    content:"unescape|28 22|";
    content:!"|29|"; within:100;
    content:"|22| +|0a|"; within:80;
    content:"|22| +|0a|"; within:80;
    content:"|22| "; within:80;
    content:"|22| +|0a|"; within:80;
    reference:url,cansecwest.com/slides07/csw07-nazario.pdf;
    reference:url,www.sophos.com/security/technical-papers/malware_with_your_mocha.html;
    classtype:shellcode-detect;
    sid:2012196; rev:5;
    metadata:created_at 2011_01_17, performance_impact Significant, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_09;
)

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