ET WEB_SERVER WebShell Generic eval of str_rot13

Query · suricata

flow:established,from_server;
file_data;
content:"str_rot13"; nocase; fast_pattern;
content:"eval"; nocase;
pcre:"/^[\r\n\s]*?\x28[\r\n\s]*?str_rot13/Rsi";
Raw source ET WEB_SERVER WebShell Generic eval of str_rot13 · 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 -> $HTTP_SERVERS any (
    msg:"ET WEB_SERVER WebShell Generic eval of str_rot13";
    flow:established,from_server;
    file_data;
    content:"str_rot13"; nocase; fast_pattern;
    content:"eval"; nocase;
    pcre:"/^[\r\n\s]*?\x28[\r\n\s]*?str_rot13/Rsi";
    classtype:trojan-activity;
    sid:2017401; rev:8;
    metadata:created_at 2013_08_31, confidence Medium, signature_severity Major, updated_at 2019_10_08;
)

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