ET MALWARE W32/Citadel Download From CnC Server /files/ attachment

Query · suricata

flow:established,to_client;
flowbits:isset,et.citadel;
http.header;
content:"Content-Disposition|3a 20|attachment|3b 20|filename=|22 25 32 65|/files/"; fast_pattern;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE W32/Citadel Download From CnC Server /files/ attachment · 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 MALWARE W32/Citadel Download From CnC Server /files/ attachment";
    flow:established,to_client;
    flowbits:isset,et.citadel;
    http.header;
    content:"Content-Disposition|3a 20|attachment|3b 20|filename=|22 25 32 65|/files/"; fast_pattern;
    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:2018599; rev:8;
    metadata:created_at 2014_06_24, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_30;
)

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