SV-225026r991589: Windows Server 2016 built-in administrator account must be renamed. | Microsoft Windows Server 2016 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows Server 2016 built-in administrator account must be renamed.

Description

Discussion Text

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.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366SV-88287V-73623

References

DPMS Target Microsoft Windows Server 2016 DISA DPMS Target Microsoft Windows Server 2016 4205

Checks

DISA STIG (Manual Reference)

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.

For server core installations, run the following command:

Secedit /Export /Areas SecurityPolicy /CFG C:\Path\FileName.Txt

If "NewAdministratorName" is not something other than "Administrator" in the file, this is a finding.

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.windows:def:1185
# Windows Server 2016 built-in administrator account must be renamed.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.
#
# MANUAL REVIEW REQUIRED -- the module(s) below could not be reconstructed
# into working code from curated SCC reference data, and are excluded from
# the automated result:
#   - sid_sid_object (sid_sid_test) -- Verifies 'Accounts: Rename administrator account' is not set to 'localdomain\Administrator': field "trustee_name" has an unresolved variable reference

# Verifies 'Accounts: Rename administrator account' is not set to 'Administrator'
# sid_sid_object (sid_sid_test)
function test_1 {
  return (((Get-LocalUser | Where-Object {$_.SID.Value -match '^S-1-5-[0-9-]+-500$'}).Name) -eq 'Administrator')
}

if (test_1) {
  Write-Output "PASS (automated portion only -- MANUAL REVIEW still required, see notes above)"
} else {
  Write-Output "FAIL (or see MANUAL REVIEW note above)"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_windows_server_2016 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows:def:1185
$adminSID = "S-1-5-21-"; (Get-CimInstance -ClassName Win32_ComputerSystem).DomainSID.Value -join "-"
$adminAccount = Get-CimInstance -ClassName Win32_Trustee -Filter "SID='$adminSID'" | Select-Object -ExpandProperty Name
if ($adminAccount -notin @("Administrator", "localdomain\Administrator")) { Write-Output "PASS"; Exit 0 } else { Write-Output "FAIL"; Exit 1 }

Remediation

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".