LoFP LoFP / new legitimate applications or integrations recently deployed in the environment may trigger this detection during initial setup or rollout phases.

Techniques

Sample rules

Entra ID Sharepoint or OneDrive Accessed by Unusual Client

Description

Identifies when an application accesses SharePoint Online or OneDrive for Business for the first time in the tenant within a specified timeframe. This detects successful OAuth phishing campaigns, illicit consent grants, or compromised third-party applications gaining initial access to file storage. Adversaries often use malicious OAuth applications or phishing techniques to gain consent from users, allowing persistent access to organizational data repositories without traditional credential theft.

Detection logic

data_stream.dataset:azure.signinlogs and
azure.signinlogs.properties.resource_id:(
    00000003-0000-0ff1-ce00-000000000000 or
    6a9b9266-8161-4a7b-913a-a9eda19da220
) and
azure.signinlogs.properties.app_id:(* and not (
    00000003-0000-0ff1-ce00-000000000000 or
    08e18876-6177-487e-b8b5-cf950c1e598c or
    5e3ce6c0-2b1f-4285-8d4b-75ee78787346 or
    9199bf20-a13f-4107-85dc-02114787ef48 or
    ab9b8c07-8f02-4f72-87fa-80105867a763 or
    af124e86-4e96-495a-b70a-90f90ab96707 or
    cc15fd57-2c6c-4117-a88c-83b1d56b4bbe
)) and
not (
    azure.signinlogs.properties.app_owner_tenant_id:f8cdef31-a31e-4b4a-93e4-5f571e91255a and
    azure.signinlogs.category:MicrosoftServicePrincipalSignInLogs
) and
azure.signinlogs.properties.tenant_id:* and
event.outcome:success