ET POLICY Dropbox.com Offsite File Backup in Use

Query · suricata

flow:established,to_client;
tls.cert_subject;
content:"CN=*.dropbox.com"; fast_pattern;
threshold:type limit, count 1, seconds 300, track by_src;
Raw source ET POLICY Dropbox.com Offsite File Backup in Use · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls [108.160.162.0/20,162.125.0.0/16,192.189.200.0/23,199.47.216.0/22,205.189.0.0/24,209.99.70.0/24,45.58.64.0/20] 443 -> $HOME_NET any (
    msg:"ET POLICY Dropbox.com Offsite File Backup in Use";
    flow:established,to_client;
    tls.cert_subject;
    content:"CN=*.dropbox.com"; fast_pattern;
    threshold:type limit, count 1, seconds 300, track by_src;
    reference:url,www.dropbox.com;
    reference:url,dereknewton.com/2011/04/dropbox-authentication-static-host-ids/;
    classtype:policy-violation;
    sid:2012647; rev:7;
    metadata:created_at 2011_04_07, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_25;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.