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    Tycoon Victim Grants Persistent OAuth Permissions

    avatar
    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/)
    Daniel Jeremiah@daniyyell
    •updated Jun 21, 2026•3•0•12

    Detects an account granting offline access, mail, files, directory, or user impersonation permissions shortly after anomalous authentication. This rule is designed to identify potential persistence mechanisms established by adversaries leveraging OAuth applications, as seen in campaigns like Tycoon 2FA AITM.

    Microsoft Sentinel (KQL)

    Tags

    T1671 - Cloud Application IntegrationT1528 - Steal Application Access TokenT1566.002 - Spearphishing LinkTA0003 - PersistenceTA0001 - Initial AccessTA0006 - Credential AccessAuthentication AttemptCredential AccessCloud Api CallAzureGCPOffice 365Saas ApplicationAzure Activity LogsAzure Signin LogsGCP Audit LogsGoogle Workspace Admin LogsOauth Server Generickql

    Found in

    • Tycoon 2FA AiTM Attacks Against Entra ID and GoogleLast updated Jun 11, 2026

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