Get started with the data loss prevention alerts

Your Microsoft Purview Data Loss Prevention (DLP) policies can be configured to generate alerts when the conditions in the policy are matched.

For a brief overview of alerts see:

This article includes the licensing and permission details and other crucial information you need as you work with alerts.

DLP alerts can be investigated and managed in the Microsoft Defender XDR dashboard and in the Microsoft Purview compliance portal. The Microsoft Defender XDR dashboard is the recommended location for investigating and managing DLP alerts. The Microsoft Purview compliance portal is the recommended location for creating and editing DLP policies.

Tip

If you're not an E5 customer, use the 90-day Microsoft Purview solutions trial to explore how additional Purview capabilities can help your organization manage data security and compliance needs. Start now at the Microsoft Purview compliance portal trials hub. Learn details about signing up and trial terms.

Alert types

Alerts can be sent every time an activity matches a rule, which can be noisy or they can be aggregated based on number of matches or volume of items over a set period of time. There are two types of alerts that can be configured in DLP policies.

Single-event alerts are typically used in policies that monitor for highly sensitive events that occur in a low volume, like a single email with 10 or more customer credit card numbers being sent outside your organization.

Aggregate-event alerts are typically used in policies that monitor for events that occur in a higher volume over a period of time. For example, an aggregate alert can be triggered when 10 individual emails each with one customer credit card number is sent outside your org over 48 hours.

Before you begin

Before you begin, make sure you have the necessary prerequisites:

Licensing for alert configuration options

  • Single-event alert configuration: Organizations that have an E1, F1, or G1 subscription or an E3 or G3 subscription can configure policies to generate an alert for every time a triggering activity occurs.
  • Aggregated alert configuration: To configure aggregate alert policies based on a threshold, you must have either of the following configurations:
    • An A5 subscription
    • An E5 or G5 subscription
    • An E1, F1, or G1 subscription or an E3 or G3 subscription that includes one of the following features:
      • Office 365 Advanced Threat Protection Plan 2
      • Microsoft 365 E5 Compliance
      • Microsoft 365 eDiscovery and Audit add-on license

Customers who use Endpoint DLP and who are eligible for Teams DLP will see their endpoint DLP policy alerts and Teams DLP policy alerts in the DLP alert management dashboard.

Roles and Role Groups

If you want to view the DLP alert management dashboard or to edit the alert configuration options in a DLP policy, you must be a member of one of these role groups:

  • Compliance Administrator
  • Compliance Data Administrator
  • Security Administrator
  • Security Operator
  • Security Reader
  • Information Protection Admin
  • Information Protection Analyst
  • Information Protection Investigator
  • Information Protection Reader

To learn more about them, see Permissions in the Microsoft Purview compliance portal

Here's a list of applicable role groups. To learn more about them, see Permissions in the Microsoft Purview compliance portal.

  • Information Protection
  • Information Protection Admins
  • Information Protection Analysts
  • Information Protection Investigators
  • Information Protection Readers

To access the DLP alert management dashboard, you need the Manage alerts role and either of these two roles:

  • DLP Compliance Management
  • View-Only DLP Compliance Management

To access the Content preview feature and the Matched sensitive content and context features, you must be a member of the Content Explorer Content Viewer role group, which has the Data classification content viewer role preassigned.

Tip

If the admin requires access to alerts but not contextual/sensitive information, you can create and assign a custom role that does not include Data Classification Content Viewer permission.

DLP alert configuration

To learn how to configure an alert in your DLP policy, see Create and Deploy data loss prevention policies. There are different alert configuration experiences depending on your licensing.

Aggregate event alert configuration

If you're licensed for aggregated alert configuration options, then you'll see these options when you create or edit a DLP policy.

Screenshot showing options for incident reports for users who are eligible for aggregated alert configuration options.

This configuration allows you to set up a policy to generate an alert:

  • every time an activity matches the policy conditions
  • when the defined threshold is met or exceeded
  • based on the number of activities
  • based on the volume of exfiltrated data

To prevent a flood of notification emails, all matches that occur within a one-minute time window that are for the same DLP rule and on the same location are grouped together in the same alert. The one minute aggregation time window feature is available in:

  • An E5 or G5 subscription
  • An E1, F1, or G1 subscription or an E3 or G3 subscription that includes one of the following features:
    • Office 365 Advanced Threat Protection Plan 2
    • Microsoft 365 E5 Compliance
    • Microsoft 365 eDiscovery and Audit add-on license

For organizations that have an E1, F1, or G1 subscription or an E3 or G3 subscription, the aggregation time window is 15 minutes.

Single event alert configuration

If you're is licensed for single-event alert configuration options, then you'll see these options when you create or edit a DLP policy. Use this option to create an alert that's raised every time a DLP rule match happens.

Screenshot showing options for incident reports for users who are eligible for single-event alert configuration options.

Types of events

Here are some of the events associated with an alert. In the Alert dashboard, you can choose a particular event to view its details.

Event details

Property name Description Event types
ID unique ID associated with the event all events
Location workload where the event was detected all events
time of activity time of the user activity that matched the criteria of the DLP policy

Affected entities

Property name Description Event types
user user who took the action that caused the policy match all events
hostname host name of the computer where the DLP policy match occurred device events
IP address IP address of the computer where the DLP policy match occurred device events
sha1 SHA-1 hash of the file device events
sha256 SHA-256 hash of the file device events
MDATP device ID endpoint device MDATP ID
file size size of the file SharePoint, OneDrive, and device events
file path the absolute path of the item involved with the DLP policy match SharePoint, OneDrive, and devices events
email recipients if an email was the sensitive item that matched the DLP policy, this field includes the recipients of that email Exchange events
email subject subject of the email that matched the DLP policy Exchange events
email attachments names of the attachments in the email that matched the DLP policy Exchange events
site owner name of the site owner SharePoint and OneDrive events
site URL full of the URL of the SharePoint or OneDrive site where the DLP policy match occurred SharePoint and OneDrive events
file created time of creation of the file that matched the DLP policy SharePoint and OneDrive events
file last modified the last time that the file that matched the DLP policy was changed SharePoint and OneDrive events
file size size of the file that matched the DLP policy SharePoint and OneDrive events
file owner owner of the file that matched the DLP policy SharePoint and OneDrive events

Policy details

Property name Description Event types
DLP policy matched name of the matched DLP policy all events
rule matched name of the matched DLP policy rule all events
sensitive information types (SIT) detected SITs that were detected as part of the DLP policy match all events
actions taken actions that were taken that caused the DLP policy match all events
violating action action on the endpoint device that raised the DLP alert device events
user overrode policy did the user override the policy via a policy tip all events
use override justification the text of the reason provided by the user for the override all events

Important

Your organization's audit log retention policy configuration controls how long an alert remains visible in the console. See, Manage audit log retention policies for more information.

See also