In this post I will show a tool which makes decrypting Active Directory passwords easy. It is important to note decrypting highly secure passwords takes a long time and is not always achievable within a reasonable period of time based on the complexity of the password however I have had success recently using this product.
Find a Windows Computer where the user has logged into recently and has their password cached. Next obtain the Network Password Recovery Wizard (NPRW) tool from:
After the tool simply use the GUI for performing the password encryption. I found this video very helpful.