ET INFO Observed Online Document Sharing Service Domain (onlyoffice .com in TLS SNI)

Query · suricata

flow:established,to_server;
tls.sni; dotprefix;
content:".onlyoffice.com"; endswith; fast_pattern;
threshold:type limit,count 1,seconds 300,track by_src;
Raw source ET INFO Observed Online Document Sharing Service Domain (onlyoffice .com in TLS SNI) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET INFO Observed Online Document Sharing Service Domain (onlyoffice .com in TLS SNI)";
    flow:established,to_server;
    tls.sni; dotprefix;
    content:".onlyoffice.com"; endswith; fast_pattern;
    threshold:type limit,count 1,seconds 300,track by_src;
    classtype:misc-activity;
    sid:2062768; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2025_06_04, deployment Perimeter, confidence High, signature_severity Informational, tag TA_Abused_Service, updated_at 2025_06_04;
)

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