The built-in administrator account must be renamed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-73623	WN16-SO-000030	SV-88287r1_rule		Medium

Description
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.

STIG	Date
Windows Server 2016 Security Technical Implementation Guide	2019-01-16

Details

Check Text ( C-73705r1_chk )
Verify the effective setting in Local Group Policy Editor. Run "gpedit.msc". Navigate to Local Computer Policy >> Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options. If the value for "Accounts: Rename administrator account" is not set to a value other than "Administrator", this is a finding.

Fix Text (F-80073r1_fix)
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".