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Lastly, Microsoft Defender for Endpoint checks for "suspicious LDAP and Kerberos requests to Active Directory domain controllers," which will detect "attacks using KrbRelayUp.Excel for Microsoft 365 Word for Microsoft 365 Outlook for Microsoft 365 PowerPoint for Microsoft 365 Access for Microsoft 365 OneNote for Microsoft 365 Project Online Desktop Client Publisher for Microsoft 365 Visio Plan 2 Excel 2021 Word 2021 Outlook 2021 PowerPoint 2021 Access 2021 Project Professional 2021 Project Standard 2021 Publisher 2021 Visio Professional 2021 Visio Standard 2021 OneNote 2021 Excel 2019 Word 2019 Outlook 2019 PowerPoint 2019 Access 2019 Project Professional 2019 Project Standard 2019 Publisher 2019 Visio Professional 2019 Visio Standard 2019 Excel 2016 Word 2016 Outlook 2016 PowerPoint 2016 Access 2016 OneNote 2016 Project Professional 2016 Project Standard 2016 Publisher 2016 Visio Professional 2016 Visio Standard 2016 Excel 2013 Word 2013 Outlook 2013 PowerPoint 2013 Access 2013 OneNote 2013 Project Professional 2013 Project Standard 2013 Publisher 2013 Visio Professional 2013 Visio 2013 Excel 2010 Word 2010 Outlook 2010 PowerPoint 2010 Access 2010 OneNote 2010 Project 2010 Project Standard 2010 Publisher 2010 Visio Premium 2010 Visio 2010 Visio Standard 2010 Excel 2007 Word 2007 Outlook 2007 PowerPoint 2007 Access 2007 OneNote 2007 Publisher 2007 Visio 2007 Visio Standard 2007 InfoPath 2010 InfoPath 2013 SharePoint Workspace 2010 More. Microsoft Defender for Identity (from version 2.180) detects the first three stages of such attacks "by monitoring anomalous behavior as seen by the domain controller." The Microsoft 365 Defender service can "detect and block this threat across the stages of the attack chain," the announcement indicated. Microsoft Defender Antivirus can detect the use of the KrbRelayUp tool, labeling it as malware. Microsoft touted its security tools for detecting and blocking these Kerberos resource-based constrained delegation types of attacks. At present, a default setting in Active Directory lets any user "create up to 10 computer accounts associated with them." This default setting can be exploited by attackers, who use it to set up fake computer accounts.Ī key measure to take is to set an Active Directory ms-DS-MachineAccountQuota attribute to "0" to prevent attackers from setting up such accounts.
Next, organizations also should address an attack approach that lets attackers create accounts on networks. Organizations should turn on channel binding and signing for LDAP as one measure of protection. Microsoft advised organizations using Active Directory to take a couple of steps to protect against possible Kerberos resource-based constrained delegation types of attacks. However, in hybrid identity environments where organizations synchronize their domain controllers with Azure AD, if an attacker compromises an Azure virtual machine using a synchronized account, they'll receive SYSTEM privileges on the virtual machine. It's important to note that KrbRelayUp cannot be used in attacks against organizations that are only using Azure AD. Here's Microsoft's explanation to that effect:
However, if an organization uses Active Directory, including in its "hybrid" state, synced with Azure AD, then they are subject to the attacks. Organizations that use Azure AD purely, without synchronizing it with local Active Directory, aren't subject to these Kerberos resource-based constrained delegation attacks, the announcement noted. Vulnerability Exists for 'Hybrid' Azure AD Users
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"Resource-based constrained delegation (RBCD) represents the key to this attack method, enabling the tool to impersonate an administrator and eventually run a code as the SYSTEM account of a compromised device," the announcement explained. The KrbRelayUp tool, which was published on April 24, 2022, can give attackers system privileges through its Kerberos resource-based constrained delegation exploit capabilities.
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