Microsoft 365 environments are increasingly targeted by attackers leveraging malicious OAuth applications to gain unauthorized access and persist within organizations. These hidden OAuth apps can bypass traditional security controls, making detection and mitigation challenging for security teams. To address this threat, security researchers have developed Cazadora, an open-source tool designed to identify and analyze malicious OAuth applications within Microsoft 365 tenants. Cazadora helps organizations uncover hidden OAuth apps that may be used by attackers to maintain persistence or exfiltrate data, providing detailed insights into app permissions, consent types, and associated risks.
The tool operates by querying Microsoft Graph API to enumerate all OAuth applications granted access to the tenant, then applies heuristic and behavioral analysis to flag suspicious apps. By leveraging Cazadora, security teams can proactively detect unauthorized OAuth apps, revoke malicious consents, and strengthen their Microsoft 365 security posture. This capability is crucial as OAuth abuse has become a favored attack vector for threat actors aiming to evade detection and maintain long-term access.
Implementing Cazadora as part of a comprehensive Microsoft 365 security strategy enables organizations to reduce the attack surface and respond swiftly to OAuth-based threats. The tool's open-source nature allows customization and integration with existing security workflows, enhancing threat hunting and incident response efforts. As cloud adoption grows, tools like Cazadora are vital for securing SaaS environments against sophisticated OAuth abuse attacks.
In summary, Cazadora empowers defenders to find and eliminate hidden malicious OAuth apps in Microsoft 365, mitigating risks associated with OAuth consent abuse. Organizations are encouraged to incorporate this tool into their security arsenal to safeguard sensitive data and maintain compliance in the evolving threat landscape.
This Cyber News was published on www.bleepingcomputer.com. Publication date: Mon, 20 Oct 2025 14:25:16 +0000