ET WEB_SERVER FOX-SRT - Backdoor - CryptoPHP Shell C2 POST (fsockopen)

Query · suricata

flow:established,to_server;
threshold:type limit, track by_src, count 1, seconds 600;
content:"serverKey="; fast_pattern;
content:"data=";
content:"key=";
http.method;
content:"POST";
http.connection;
content:"close"; depth:5; endswith;
http.content_type;
content:"application/x-www-form-urlencoded"; depth:33;
http.header_names;
content:!"Referer|0d 0a|";
content:!"User-Agent";
content:!"Cookie|0d 0a|";
Raw source ET WEB_SERVER FOX-SRT - Backdoor - CryptoPHP Shell C2 POST (fsockopen) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET WEB_SERVER FOX-SRT - Backdoor - CryptoPHP Shell C2 POST (fsockopen)";
    flow:established,to_server;
    threshold:type limit, track by_src, count 1, seconds 600;
    content:"serverKey="; fast_pattern;
    content:"data=";
    content:"key=";
    http.method;
    content:"POST";
    http.connection;
    content:"close"; depth:5; endswith;
    http.content_type;
    content:"application/x-www-form-urlencoded"; depth:33;
    http.header_names;
    content:!"Referer|0d 0a|";
    content:!"User-Agent";
    content:!"Cookie|0d 0a|";
    reference:url,blog.fox-it.com/2014/11/18/cryptophp-analysis-of-a-hidden-threat-inside-popular-content-management-systems/;
    classtype:command-and-control;
    sid:2019749; rev:4;
    metadata:created_at 2014_11_20, signature_severity Major, updated_at 2020_11_03;
)

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