Attempts at social engineering are commonly included in a comprehensive penetration test. Research a specific case, or speak from your own personal or professional experience, of a significant security breach of an enterprise network environment that was achieved using social engineering, and discuss the attack vectors and techniques use to carry out the attack, the probable motivation of the attacker, how the incident was detected, and the steps taken to mitigate the effects of the attack. Also, discuss the ways in which social engineering may be an important skill for a professional pen tester.