This auditing information can help investigators identify information about email messages sent from a compromised account or sent by an attacker. The audit record for a Send event contains information about the message, such as when the message was sent, the InternetMessage ID, the subject line, and if the message contained attachments. Investigators can use the Send event to identify email sent from a compromised account. The Send event is also a mailbox auditing action and is triggered when a user performs one of the following actions: Additional entries including exactly which items were sent from the compromised account are also logged. The ability to log the ‘MailItemsAccessed’ (some may know this as MessageBind, that is what it was called in on-premises Exchange). A 3rd useful capability is the additional fields that get audited when this license is applied to mailboxes. Here are the latencies associated with when the risk detections will appear:Īs noted above, the new Advanced Audit License extends the retention of the UAL audit log to 1 year and speeds up 3rd party API throttling. Each detected suspicious action is stored in a record called a risk detection. Azure AD uses adaptive machine learning algorithms and heuristics to detect suspicious actions that are related to your user accounts. Users flagged for risk – A risky user is an indicator for a user account that might have been compromised.Latency can range from as little as 5 minutes, to a maximum of 2 hours. Risky sign-ins – A risky sign-in is an indicator for a sign-in attempt that might have been performed by someone who is not the legitimate owner of a user account.There are a few really useful built-in reports that analyze the logs and produce findings. Option 1: Extend this log into Sentinel to go beyond 6 months.Requires an M365 E5 license or O365 E5 license (or available via Stand Alone).You must go to “ Connected Apps” then click the three dots to make it include the additional log sources as shown here: Not enabled by default, requires configuration.NOTE: Unlike the Azure Audit Log, the Azure AD Sign-in logs require an Azure AD P1 or higher license to export into Log Analytics. According to the documentation, 95% of all logs will show up in 2 minutes. Sign-in activity logs can take from 15 minutes to up to 2 hours for some records. Documentation: Sign-in logs in Azure Active Directory | Microsoft Docs.Option 2: Extend this log into Sentinel to get correlation and default query templates (learn how here).Option 1: Extend this log into Azure Log Analytics (aka Azure Monitor) to go beyond 30 days (learn how here).You can get around this by exporting the logs through one of the options below, which can also be used to extend retention. The export limit from the web interface is 5,000 records. A complete list of each activity audited is available ( here) Audit logs have a latency ranging from 15 minutes to an hour ![]()
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