Default System Administrator Account Not Renamed
The default system administrator account for SQL Server should be renamed from 'sa'. This account is well-known and is often the target of any database attack. For a simple way to protect this account, rename the user to something other than 'sa' and strengthen the security of the database by creating a new user called 'sa' with a secure password and no privileges.
Suggested Action
š” Select 'Suggested Script' for an automatically generated script.
Rename the system administrator account to something other than 'sa'.
How to Find the Default System Administrator Account
SELECT name
FROM sys.sql_logins
WHERE sid = 0x01;
How to Rename the Default System Administrator Account
ALTER LOGIN [sa]
WITH NAME = [SomethingElse];
Further Reading
ALTER LOGIN (Transact-SQL) | Microsoft Docs