ET MALWARE Citadel Checkin

Query · suricata

flow:established,to_server;
flowbits:set,et.citadel;
http.method;
content:"POST";
http.uri;
content:"/file.php"; fast_pattern;
pcre:"/^\/[A-Za-z0-9]+?\/file\.php$/";
http.header;
content:"Content-Length|3a 20|128|0d 0a|"; nocase;
content:"Accept|3a 20|*/*|0d 0a|User-Agent|3a 20|"; depth:25;
http.header_names;
content:!"Referer";

Rule dependencies

Feeds into

Raw source ET MALWARE Citadel Checkin · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Citadel Checkin";
    flow:established,to_server;
    flowbits:set,et.citadel;
    http.method;
    content:"POST";
    http.uri;
    content:"/file.php"; fast_pattern;
    pcre:"/^\/[A-Za-z0-9]+?\/file\.php$/";
    http.header;
    content:"Content-Length|3a 20|128|0d 0a|"; nocase;
    content:"Accept|3a 20|*/*|0d 0a|User-Agent|3a 20|"; depth:25;
    http.header_names;
    content:!"Referer";
    reference:md5,280ffd0653d150906a65cd513fcafc27;
    reference:md5,f1c8cc93d4e0aabd4713621fe271abc8;
    reference:url,arbornetworks.com/asert/2014/06/the-citadel-and-gameover-campaigns-of-5cb682c10440b2ebaf9f28c1fe438468/;
    classtype:command-and-control;
    sid:2018598; rev:5;
    metadata:created_at 2014_06_24, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_07;
)

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