It's an inside job - [control security]

This paper discusses that some hacking incidents mostly happened to banks are merely done by an inside job. Internal threat comes not only from staff who may have been forced into helping malicious outsiders but from disgruntled employees and former employees. So one way of securing customers' accounts is that to not to do things such as sing default passwords. Also when an employee leaves the company, ensure they return all IT assets as well as their access cards an change or delete their passwords.