The best defense is to have consistent testing on your companies security system. A red-team can put your current system through its worst-case scenario, allowing you to button up any major flaws.
When the team starts they warn that you will be shocked by what they will be able to access, everything from financial systems, secret intellectual data, your customers' data and more. But it is better to have it done by someone you hired than someone looking to harm you.
The security firms recommend that you do this multiple times, in order to see how you are not aware of your system being compromised, how you can begin to spot it, and eventually how you can prevent and react to it.
With this data, you can go back to the drawing board and fix any major breaches that are affecting your organization. It is recommended that you take multiple approaches that are targeted, such as with a marketing focus versus a financial data, as each sector of your company will have different goals.
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