check_mdi

checkmdi Python script to enumerate valid Microsoft 365 domains, retrieve tenant name, and check for a Microsoft Defender for Identity MDI instance. Based on: https://github.com/thalpius/Microsoft-Defender-for-Identity-Check-Instance. Usage ./checkmdi.py -d...

Vulnerabilities fixed in Microsoft Defender

Microsoft has fixed vulnerabilities in Defender for Endpoint and Defender for Identity. A malicious party could exploit the vulnerabilities to impersonate another user and assign themselves elevated privileges, enabling execution of arbitrary code with SYSTEM privileges. For successful...

CVE-2025-26685

Improper authentication in Microsoft Defender for Identity allows an unauthorized attacker to perform spoofing over an adjacent network...

CVE-2025-26685: Improper Authentication

Improper authentication in Microsoft Defender for Identity allows an unauthorized attacker to perform spoofing over an adjacent network...

Unlock 24/7 SOC Coverage: Rapid7 MXDR Now Supports with Microsoft Security Products

In today’s complex threat landscape, organizations need every advantage at their disposal to stay secure–starting with maximizing the tools they already have within their ecosystem. With the launch of Rapid7 MXDR’s SOC support for key Microsoft security products, we’re making it possible for...

Two Active Directory Bugs Lead to Easy Windows Domain Takeover

A proof-of-concept tool has been published that leverages two Windows Active Directory bugs fixed last month that, when chained, can allow easy Windows domain takeover. In a Monday alert, Microsoft urged organizations to immediately patch the pair of bugs, tracked as CVE-2021-42287 and...

A guide to combatting human-operated ransomware: Part 1

This blog is part one of a two-part series focused on how Microsoft DART helps customers with human-operated ransomware. For more guidance on human-operated ransomware and how to defend against these extortion-based attacks, refer to our human-operated ransomware docs page. Microsoft’s Detection...

A guide to combatting human-operated ransomware: Part 1

This blog is part one of a two-part series focused on how Microsoft DART helps customers with human-operated ransomware. For more guidance on human-operated ransomware and how to defend against these extortion-based attacks, refer to our human-operated ransomware docs page. Microsoft’s Detection...

Stopping Carbanak+FIN7: How Microsoft led in the MITRE Engenuity® ATT&CK® Evaluation

In MITRE Engenuity’s recent Carbanak+FIN7 ATT&CK Evaluation, Microsoft demonstrated that we can stop advanced, real-world attacks by threat actor groups with our industry-leading security capabilities. In this year’s evaluation, we engaged our unified Microsoft 365 Defender stack, with...

Zerologon is now detected by Microsoft Defender for Identity

There has been a huge focus on the recently patched CVE-2020-1472 Netlogon Elevation of Privilege vulnerability, widely known as ZeroLogon. While Microsoft strongly recommends that you deploy the latest security updates to your servers and devices, we also want to provide you with the best...

Zerologon is now detected by Microsoft Defender for Identity

There has been a huge focus on the recently patched CVE-2020-1472 Netlogon Elevation of Privilege vulnerability, widely known as ZeroLogon. While Microsoft strongly recommends that you deploy the latest security updates to your servers and devices, we also want to provide you with the best...