Find accounts with passwords that are not complex
Maybe that will help 
PWDCOMPARE (https://docs.microsoft.com/en-us/sql/t-sql/functions/pwdcompare-transact-sql?view=sql-server-2017)?

Some example:
https://dzone.com/articles/use-pwdcompare-to-find-sql-logins-with-weak-passwo

Credits @SQLRockstar link

First, let's build a list of weak passwords and save it to file:

$pwdList = Get-Content .\password_list.txt


Build a query and execute against SQL Server:

$SQLText = "SELECT name FROM sys.sql_logins WHERE PWDCOMPARE('$password', password_hash) = 1;"
Invoke-Sqlcmd -Query $SQLText -ServerInstance $SQLServer
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