From Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide
Part of Rename Built-in Administrator Account
Associated with: CCI-000366
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.
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.
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".
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