Need to replace permission on 300 machines under the permission tab

Hello all,

I have 300 machines with Active directory permissions set test@abc.com or abc\test. We are switching domains to aabc.com so I need to add test@aabc.com to all the VMs this person owns. I could do it manually but it would take forever since 7 account might have permission to one machine. Is this possible thorugh a script to basically find all current permission in vcenter and add the same account under aabc.com

Thanks,