After a penetration test on the internal network, the following report was generated:

Attack Target Result

Compromised host ADMIN01S.CORP.LOCAL Successful

Hash collected KRBTGT.CORP.LOCAL Successful

Hash collected SQLSV.CORP.LOCAL Successful

Pass the hash SQLSV.CORP.LOCAL Failed

Domain control CORP.LOCAL Successful

Which of the following should be recommended to remediate the attack?