The built-in administrator account must be renamed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-63619	WN10-SO-000020	SV-78109r1_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 10 Security Technical Implementation Guide	2018-06-07

Details

Check Text ( C-64371r2_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 set to "Administrator", this is a finding.

Fix Text (F-69551r1_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".