For auditing-related activities (such as file and folder activities), you can establish a baseline based on a single user or based on all users in your organization for malware-related activities, you can establish a baseline based on a single malware family, a single recipient, or all messages in your organization. After the baseline is established, an alert is triggered when the frequency of the activity tracked by the alert policy greatly exceeds the baseline value. It takes up to seven days to establish this baseline, during which alerts won't be generated. If you select the setting based on unusual activity, Microsoft establishes a baseline value that defines the normal frequency for the selected activity. This allows you to set up a policy to generate an alert every time an activity matches the policy conditions, when a certain threshold is exceeded, or when the occurrence of the activity the alert is tracking becomes unusual for your organization. You can configure a setting that defines how often an activity can occur before an alert is triggered. For more information, see User tags in Microsoft Defender for Office 365. You can use system user tags or custom user tags. This results in the alerts triggered by the policy to include the context of the impacted user. ![]() You can also define user tags as a condition of an alert policy. ![]() The available conditions are dependent on the selected activity. You can also configure a condition that triggers an alert when the activity is performed by any user in your organization. Common conditions include IP addresses (so that an alert is triggered when the user performs the activity on a computer with a specific IP address or within an IP address range), whether an alert is triggered if a specific user or users perform that activity, and whether the activity is performed on a specific file name or URL. For most activities, you can define additional conditions that must be met to trigger an alert. In general, activities related to malware campaigns and phishing attacks require an E5/G5 subscription or an E1/F1/G1 or E3/F3/G3 subscription with an Defender for Office 365 Plan 2 add-on subscription.Īctivity conditions. ![]() The activities that you can track depend on your organization's Office 365 Enterprise or Office 365 US Government plan. Go to the Microsoft 365 Defender portal and under Email & collaboration select Policies & rules > Alert policy. Go to the compliance portal, and then select Policies > Alert > Alert policies. For example, you can view alerts that match the conditions from the same category or view alerts with the same severity level. These two settings help you manage alert policies (and the alerts that are triggered when the policy conditions are matched) because you can filter on these settings when managing policies and viewing alerts in the Microsoft Purview compliance portal. You also categorize the policy and assign it a severity level. Managing alerts consists of assigning an alert status to help track and manage any investigation.Īn alert policy consists of a set of rules and conditions that define the user or admin activity that generates an alert, a list of users who trigger the alert if they perform the activity, and a threshold that defines how many times the activity has to occur before an alert is triggered. For more information, see RBAC permissions required to view alerts.Īn admin manages alerts in the Microsoft Purview compliance portal. The alerts that an admin or other users can see that on the Alerts page is determined by the roles assigned to the user. ![]() Also, if email notifications are enabled for the alert policy, Microsoft sends a notification to a list of recipients. Microsoft 365 generates an alert that's displayed on the Alerts page in compliance portal or Defender portal. In the case of malware attacks, infected email messages sent to users in your organization trigger an alert. This is because the policy has to be synced to the alert detection engine.Ī user performs an activity that matches the conditions of an alert policy. It takes up to 24 hours after creating or updating an alert policy before alerts can be triggered by the policy.
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