Information
Windows Server 2019 built-in administrator account must be renamed.
GROUP ID:V-205909
RULE ID:SV-205909r991589
The built-in administrator account is a well-known account subject to attack. Renaming this account to an unidentified name improves the protection of this account and the system.
Solution
Configure the policy value for
Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> 'Accounts: Rename administrator account' to a name other than 'Administrator'.