NOTE: I am not recommending this group for I don't recommend in this situation, but feel compelled to mention them to address this comment as a counterexample:

NOTE: I am not recommending this group for I don't recommend in this situation, but feel compelled to mention them to address this comment as a counterexample: Mandiant was bought out by FireEye. https://www.fireeye.com/services.html https://www.fireeye.com/services.html I believe Sony was using them for forensics as well as establish their new more secure system. It is important to set up systems so that hackers if (and when) they do breech, are found ASAP, and only get access to compartments and not the entire company. There are also Israelis that I know of who have a good reputation in cybersecurity.