Directory Service Restore Mode(DSRM) Registry Value Tampering

Nischal Khadgi

Detects changes to "DsrmAdminLogonBehavior" registry value. During a Domain Controller (DC) promotion, administrators create a Directory Services Restore Mode (DSRM) local administrator account with a password that rarely changes. The DSRM account is an “Administrator” account that logs in with the DSRM mode when the server is booting up to restore AD backups or recover the server from a failure. Attackers could abuse DSRM account to maintain their persistence and access to the organization's Active Directory. If the "DsrmAdminLogonBehavior" value is set to "0", the administrator account can only be used if the DC starts in DSRM. If the "DsrmAdminLogonBehavior" value is set to "1", the administrator account can only be used if the local AD DS service is stopped. If the "DsrmAdminLogonBehavior" value is set to "2", the administrator account can always be used.

2024-07-11 00:00:00

None

b61e87c0-50db-4b2e-8986-6a2be94b33b0

attack.persistence attack.t1556 DEMO

Community Rule

Nasreddine Bencherchali

Merge PR #4950 from @nasbench - Comply With v2 Spec Changes

2024-08-12

nischalkhadgi62

Merge PR #4903 from @nischalkhadgi62 - Add `Directory Service Restore Mode(DSRM) Registry Value Tampering`

2024-07-12