ET INFO Dropbox paper Document Request Observed

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/scl/fi/"; startswith;
pcre:"/^[a-zA-Z0-9]{21}\//R";
content:".paper|3f|rlkey|3d|"; fast_pattern;
pcre:"/^[a-zA-Z0-9]{21}/R";
http.host; bsize:15;
content:"www.dropbox.com";
target:src_ip;
Raw source ET INFO Dropbox paper Document Request Observed · 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 INFO Dropbox paper Document Request Observed";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/scl/fi/"; startswith;
    pcre:"/^[a-zA-Z0-9]{21}\//R";
    content:".paper|3f|rlkey|3d|"; fast_pattern;
    pcre:"/^[a-zA-Z0-9]{21}/R";
    http.host; bsize:15;
    content:"www.dropbox.com";
    classtype:misc-activity;
    sid:2052813; rev:2;
    metadata:affected_product Any, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_05_21, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag TA_Abused_Service, updated_at 2026_01_20;
    target:src_ip;
)

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