The built-in administrator account must be disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-16047	WN08-SO-000001	SV-48262r1_rule		Medium

Description
The built-in administrator account is a well-known account subject to attack. It also provides no accountability to individual administrators on a system. It must be disabled to prevent its use.

STIG	Date
Windows 8/8.1 Security Technical Implementation Guide	2018-02-12

Details

Check Text ( C-44940r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.) Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "Accounts: Administrator account status" is not set to "Disabled", this is a finding.

Fix Text (F-41397r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Accounts: Administrator account status" to "Disabled".