The built-in administrator account must be renamed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-225450	WN12-SO-000005	SV-225450r569185_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
Microsoft Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide	2022-03-01

Details

Check Text ( C-27149r471692_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-27137r471693_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".