What defensive measures can prevent or detect the use of MachineAccount hashes for DCSync?

After an incident, administrators should update both domain admin passwords and the domain controller's computer account password hash. Monitor for DCSync audit events (e.g., Event ID 4662) and check for unauthorized Group Policy changes that disable automatic password updates (`DisablePasswordChange`). While disabling password changes can make attacks easier, it is generally not recommended. For detection techniques, refer to the DCSync detection methods in Domain Penetration - Obtaining the NTDS.dit File from Domain Controller Servers.