If you’re still running default Administrator accounts on your Windows Servers, you’re practically handing attackers a key. This isn’t theoretical; tools like Mimikatz and CrackMapExec prioritize RID 500, making it a prime target for lateral movement.
The built-in Administrator account has a critical flaw: it cannot be locked out. That means endless brute-force attempts. It also bypasses UAC, giving attackers an immediate leg up if they compromise it. This is basic hygiene, yet I still see it missed in many organizations.
The fix is simple and immediate: rename it, then disable it. Create a new, standard admin account for daily use.
Here’s the command for Windows Server: Rename-LocalUser -Name “Administrator” -NewName “scw_admin_disabled” Disable-LocalUser -Name “scw_admin_disabled”
Don’t leave this glaring vulnerability open. Tackle it today.
The fix
# PowerShell
Rename-LocalUser -Name "Administrator" -NewName "scw_admin_disabled"
Disable-LocalUser -Name "scw_admin_disabled"
Reference: CIS Windows Server Benchmark 2.3.1.1