A friend asked how to handle an overzealous white-hat hacker who asked to be hired to close holes and locate more weaknesses. The hacker probed the publically exposed computer networks and assets of a friend’s company. Any security probing of a computer or network without the express permission of the owners is an ethical violation. The Internet is full of stories of spurned, previously “good guy” hackers who move over to the dark side because someone (or a bunch of someones) pissed them off, or because there’s easier, faster money to be made.”]
Source: https://www.csoonline.com/article/2614260/how-to-fend-off-aggressive-white-hat-hackers.html