Trust no one. That’s what the “Smoking Man” warned Agent Moulder in the cult classic “X Files” TV series. We think the Smoking Man might have been onto something.

US-based SunTrust Bank said it is working with law enforcement after it discovered that a former employee had stolen private information belonging to nearly 1.5 million customers. While some personal details, such as SSN and driver’s license numbers weren’t compromised — names, addresses and account balances were. Either way, this highlights the importance of security measure to protect against intra-company and third-party vendor vulnerabilities. The insider threat is a big challenge because these are often our friends and the very people we trust with the keys to our corporate kingdoms.

Did we mention that we miss the original X Files?