Microsoft Defender for Office 365: Message Warnings for Messages with Malicious URL in Teams

🚨 The Signal: Microsoft Defender for Office 365 now automatically detects and warns users about malicious URLs in Microsoft Teams messages. This enhances protection against phishing and malware within Teams communications.

The Impact

All Teams users are affected, with a reduced risk of clicking malicious links and improved protection against social engineering attacks.

• End Users: Reduced risk from malicious links in Teams.
• Security Teams: Enhanced visibility and protection against Teams-based threats.
• Admins: Less manual intervention needed for Teams threat detection.

The Action

1. Review existing Microsoft Defender for Office 365 anti-phishing and anti-malware policies in the Microsoft 365 Defender portal to ensure optimal configuration for Teams protection.
2. Communicate to end-users about the new warning messages in Teams and reinforce safe browsing practices.
3. Monitor Defender for Office 365 reports for Teams-related threat detections and user actions.

Domain: Defender · Impact: medium · Workload: Microsoft Defender · Essential Eight: User Application Hardening · ISM: ISM-1412, ISM-1485, ISM-1486, ISM-1542, ISM-1585, ISM-1667, ISM-1668, ISM-1669, ISM-1670, ISM-1823, ISM-1824, ISM-1859, ISM-1860