When you are victim of a cyber crime, the first step is know what was stolen from your corporation's network, how they do it? and how exactly they make this attack. All this information is vital to know what steps to take next to protect your network and avoid the risk of this incident happening again.
It also help your organization to train your staff in taking all the precautions and security measures in order to avoid this situation again.
Also, this knowledge will help you to set legal responsibilities, protect your company from future customers and employees lawsuits and make a formal denounce to the authorities about his crime.