ET HUNTING SUSPICIOUS XXTEA UTF-16 Encoded HTTP Response

Query · suricata

flow:from_server,established;
content:"u|00|t|00|f|00|8|00|t|00|o|00|1|00|6|00|"; nocase;
content:"x|00|x|00|t|00|e|00|a|00|_|00|d|00|e|00|c|00|r|00|y|00|p|00|t|00|"; nocase; fast_pattern;
content:"b|00|a|00|s|00|e|00|6|00|4|00|d|00|e|00|c|00|o|00|d|00|e"; nocase;
Raw source ET HUNTING SUSPICIOUS XXTEA UTF-16 Encoded HTTP Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING SUSPICIOUS XXTEA UTF-16 Encoded HTTP Response";
    flow:from_server,established;
    content:"u|00|t|00|f|00|8|00|t|00|o|00|1|00|6|00|"; nocase;
    content:"x|00|x|00|t|00|e|00|a|00|_|00|d|00|e|00|c|00|r|00|y|00|p|00|t|00|"; nocase; fast_pattern;
    content:"b|00|a|00|s|00|e|00|6|00|4|00|d|00|e|00|c|00|o|00|d|00|e"; nocase;
    classtype:bad-unknown;
    sid:2018175; rev:2;
    metadata:created_at 2014_02_25, confidence Medium, signature_severity Minor, updated_at 2019_07_26;
)

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