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    Bulk SharePoint/OneDrive/Exchange file exfiltration by single user

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    GlassDiceBearhttps://www.dicebear.comhttps://creativecommons.org/publicdomain/zero/1.0/„Glass” (https://www.dicebear.com) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)
    Ibrahim Saud@tektrix
    •updated Sep 21, 2026•0•0•2

    Detects high-volume file access or download activity by a single user in SharePoint or OneDrive over a 15-minute window. This behavior is indicative of bulk cloud data exfiltration often associated with extortion campaigns.

    YARA-L

    Tags

    T1567 - Exfiltration Over Web ServiceT1567.002 - Exfiltration to Cloud StorageTA0010 - ExfiltrationFile AccessFile DownloadData ExfiltrationCloud Storage AccessOffice 365Saas ApplicationM365 Unified Audit Log

    Found in

    • PREY-0058 Vishing and Cloud Data ExtortionLast updated Sep 8, 2026
    • PREY-0058 Vishing and Cloud Data ExtortionLast updated Sep 8, 2026
    • PREY-0058 Vishing and Cloud Data ExtortionLast updated Sep 8, 2026
    • PREY-0058 Vishing and Cloud Data ExtortionLast updated Sep 8, 2026

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