ET EXPLOIT_KIT Likely Evil JS used in Unknown EK Landing

Query · suricata

flow:established,from_server;
file_data;
content:"base64decode"; nocase;
content:"xxtea_decrypt"; nocase; fast_pattern;
content:"long2str"; nocase;
content:"str2long"; nocase;
Raw source ET EXPLOIT_KIT Likely Evil JS used in Unknown EK Landing · 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 EXPLOIT_KIT Likely Evil JS used in Unknown EK Landing";
    flow:established,from_server;
    file_data;
    content:"base64decode"; nocase;
    content:"xxtea_decrypt"; nocase; fast_pattern;
    content:"long2str"; nocase;
    content:"str2long"; nocase;
    classtype:exploit-kit;
    sid:2021218; rev:4;
    metadata:created_at 2015_06_09, confidence Medium, signature_severity Major, updated_at 2019_10_08;
)

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