With security it is always cat and mouse and the target is always moving due to software updates, new OS's, and applications. I agree with Troels that you need

With security it is always cat and mouse and the target is always moving due to software updates, new OS's, and applications. I agree with Troels that you need a shard security sysadmin with a plan in place before an attack ever happens. If a company is scrambling at the last second trying to put security measures in place or hiring security staff to assist. It is already to late. Preparation , testing, and regular updates is key to security