Boost Security: Remove Unsecure SID History with Defender
Image Source:
Apr 25, 2024 8:30 AM

Boost Security: Remove Unsecure SID History with Defender

by HubSite 365 about Raymond Roethof [MVP] (Microsoft Security Blog)

Microsoft Security MVP

AdministratorSecurityLearning Selection

Boost Security: Eliminate Risk with Microsofts SID Removal Guide

Key insights


  • Microsoft Defender for Identity leverages Secure Score to enhance security posture with fourteen recommended actions.

  • Recommended action to Remove unsecure SID history attributes from entities to prevent security risks.

  • Not all administrators see SID history as a risk, but removing it reduces the chance of attack across forests.

  • Microsoft Defender for Identity can identify objects with SID history, aiding in its removal.

  • Removing SID history is essential in a single-forest, single-domain environment, and post-migration to safeguard against unauthorized access.

Insight into Microsoft Defender for Identity's Role in Enhancing Security

Microsoft Defender for Identity plays a crucial role in bolstering an organization's security through the implementation of fourteen recommended actions. By focusing on actions like the removal of unsecure SID history attributes from entities, it targets the mitigation of specific security vulnerabilities that could be exploited in cross-forest attacks. The existence of SID history within Active Directory objects is a notable concern, especially when it comes to maintaining security post-migration. Although some administrators may overlook the potential risks associated with SID history, its presence can facilitate unauthorized access across forests, making it imperative for organizations to address.

Defender for Identity's capability to identify objects carrying SID history is vital, as it simplifies the process of securing Active Directory environments against potential threats. Organizations are encouraged to remove SID history, especially in single-forest, single-domain environments where its necessity is null. The overarching goal is to ensure a streamlined and secure Active Directory environment, free from remnants of migrations that could compromise security. Microsoft's ongoing efforts to update and refine recommended actions underscore the importance of adaptive security measures in the face of evolving threats.

Read the full article Microsoft Defender for Identity Recommended Actions: Remove unsecure SID history attributes from ent

Identity - Boost Security: Remove Unsecure SID History with Defender



  • Resolve unsecure domain configurations
  • Resolve unsecure account attributes
  • Remove dormant accounts from sensitive groups
  • Protect and manage local admin passwords with Microsoft LAPS
  • Configure VPN integration
  • Reduce lateral movement path risk to sensitive entities
  • Stop clear text credentials exposure
  • Disable Print spooler service on domain controllers
  • Stop weak cipher usage
  • Remove unsecure SID history attributes from entities
  • Modify unsecure Kerberos delegations to prevent impersonation
  • Install Defender for Identity Sensor on all Domain Controllers
  • Set a honeytoken account

The process of removing SID history attributes, as outlined, requires careful planning, auditing, and expertise. This action aims to secure environments against potential attacks exploiting SID histories. SID filtering helps by blocking high-privilege group SIDs during cross-forest authentication, adding an extra security layer.

Conclusively, while SID history can be beneficial for maintaining access post-migration, it poses a security risk if not managed properly. Microsoft Defender for Identity helps identify objects with SID history, aiding administrators in mitigating security threats across forests.

Exploring the Importance of Managing SID History in Active Directory

Managing SID history within Active Directory is crucial for maintaining a secure IT environment. As organizations grow and evolve, so too does the need for migrating objects between forests. This migration often leverages SID history to maintain access permissions, yet if not managed correctly, it can expose businesses to cyber threats.

The role of SID history in migrations is significant but requires vigilant management to ensure security isn't compromised. Tools like Microsoft Defender for Identity provide the necessary insight to identify and remove unsecure SID history attributes, a vital step in safeguarding against unauthorized access. By following Microsoft's recommendations, organizations can reduce the risk of attacks aiming to exploit these histories.

Ultimately, the goal is to achieve a secure, single-forest, single-domain environment where SID history is no longer needed. Properly managing this aspect of Active Directory not only enhances security but also streamlines permission management across the organization. As the digital landscape evolves, so too should the strategies for managing identity and access, with SID history management being a key component.



Microsoft Defender for Identity, recommended actions, remove SID history, unsecure attributes, security improvement, identity protection, Active Directory security, SID history cleanup