How to Audit Teams Messages Detected by DLP Rules in M365

When sensitive messages are shared via Microsoft Teams, DLP policies automatically apply predefined rules to protect your valuable data. However, users may override these rules or report them as false positives. Regularly reviewing audit logs provides valuable insights to strengthen security measures and prevent the leakage of sensitive information.

Analyze the audit logs to determine whether DLP-detected Teams messages contain sensitive information. This process helps you to identify any false positives flagged messages and allows for fine-tuning of the DLP rules.

Alerts are crucial for identifying potential policy violations. By actively monitoring them, organizations can take proactive measures to protect sensitive information, refine DLP policies, and reduce false positives.

For an in-depth audit and investigation of DLP policy violations in Microsoft Teams, review the alerts generated in the Microsoft Defender portal.

Here, you can review key details of the DLP policy violations, including the user involved, the specific policy, the type of sensitive information, event time, and more.

Additionally, you can manage, and tune alerts based on the audit to enhance their accuracy and gain better insights into threats facing your organization.

With AdminDroid's built-in charts, get a comprehensive overview of Data Loss Prevention alerts related to Microsoft Teams summarizing triggered alerts over a specified period. This includes daily summaries by daily alert counts, counts by policy name, and counts by category and policy type. You can also filter alerts based on severity.

It helps you to quickly identify trends and patterns in DLP violations, enabling timely responses to potential data breaches and ensuring compliance.

Data Loss Prevention (DLP) policies are one of the most effective ways to detect and prevent sensitive information from leaking out of an organization. Microsoft enhances this by providing default DLP policies for Microsoft Teams.

Scope of default Teams DLP policy: The default DLP policy for Teams automatically tracks all credit card numbers shared within the organization. While it doesn't provide policy tips to end users, it generates an alert and sends a low-severity email notification to the designated admin. Therefore, it will be useful to edit the default DLP policy for Microsoft Teams to address specific needs.

Note: Misconfigurations can lead to data leaks and may unintentionally block legitimate Teams messages, disrupting communication and lowering productivity. Therefore, it is essential to monitor changes made to the DLP policies and rules to prevent these issues. However, there is no dedicated way to audit changes in Microsoft 365.

• AdminDroid's Data Loss Prevention Policies and Rules report helps to audit all DLP policies and rule-based changes to effectively identify and safeguard sensitive information within your organization.
• It provides clear details on the operations performed, including which rule or policy was impacted, the status of the changes, user types involved, and more.

Handy hint: You can apply various filter options to quickly identify changes, such as New-DlpCompliancePolicy, Remove-DlpCompliancePolicy, Get-DlpComplianceRule, New-DlpComplianceRule, and more.

Since Microsoft Teams is a primary collaboration tool for organizations, implementing DLP policies to block the external sharing of sensitive information in Teams chats is essential. This helps ensure data security and prevents unintentional disclosure of confidential data.

The default DLP policy for Teams covers only sensitive information like credit card details, we need to create a custom policy tailored to our specific needs.

Follow the steps below to create a policy that blocks the sharing of IP addresses and password credentials with external users through Teams messages.

When you attempt to share your IP address with external users through Teams messages, it will be blocked by our configured policy.