ET HUNTING Double Extension ZIP File Downloaded from Discord (Request)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.host;
content:".discordapp.com"; endswith; fast_pattern;
http.uri;
content:"/attachments/"; startswith;
content:".zip"; nocase; endswith;
pcre:"/^\/attachments\/[0-9]{18}\/[0-9]{18}\/\w+\.(?:p(?:ptx?|df|ng)|(?:gi|rt)f|docx?|jpe?g|xlsx?)\.zip$/";
Raw source ET HUNTING Double Extension ZIP File Downloaded from Discord (Request) · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING Double Extension ZIP File Downloaded from Discord (Request)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.host;
    content:".discordapp.com"; endswith; fast_pattern;
    http.uri;
    content:"/attachments/"; startswith;
    content:".zip"; nocase; endswith;
    pcre:"/^\/attachments\/[0-9]{18}\/[0-9]{18}\/\w+\.(?:p(?:ptx?|df|ng)|(?:gi|rt)f|docx?|jpe?g|xlsx?)\.zip$/";
    classtype:unknown;
    sid:2035027; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_02_01, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_01, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1036, mitre_technique_name Masquerading;
)

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