Source: 5 things to know about ransomware threats in 2025 | CSO Online Author: unknown URL: https://www.csoonline.com/article/3833826/how-to-configure-oauth-in-microsoft-365-defender-and-keep-your-cloud-secure.html

ONE SENTENCE SUMMARY:

Cloud authentication offers security and efficiency but requires vigilant monitoring to prevent OAuth abuse, phishing attacks, and Active Directory compromises.

MAIN POINTS:

1. Cloud authentication enhances security, scalability, and cost-efficiency but can be exploited if not properly managed.
2. OAuth technology enables third-party access without sharing credentials but can be misused for unauthorized access.
3. Attackers exploit OAuth through phishing, stealing session tokens to gain persistent access.
4. Microsoft 365 Defender helps detect OAuth-related threats, including business email compromise and phishing attacks.
5. Organizations should regularly review OAuth connections, focusing on high-risk permissions and newly authorized apps.
6. Administrative approval for OAuth applications can prevent unauthorized access but may introduce operational overhead.
7. Monitoring OAuth logs and resetting credentials after a compromise is crucial for security.
8. On-premises Active Directory is also targeted, requiring additional security measures.
9. Microsoft 365 Defender tools help identify vulnerabilities and recommend security improvements.
10. Regular reviews and proactive security measures, such as LAPS, help prevent lateral movement and credential misuse.

TAKEAWAYS:

1. Regularly audit OAuth applications and permissions to mitigate security risks.
2. Enable administrative approval for OAuth apps to prevent unauthorized access.
3. Use Microsoft 365 Defender to detect and respond to OAuth-related attacks.
4. Implement LAPS to manage administrator passwords and prevent lateral movement.
5. Continuously monitor cloud authentication and Active Directory security to stay ahead of threats.