Dawn Cappelli is the co-author of the just-released The Cert Guide To Insider Threats. She and the Secret Service have reviewed hundreds of hacking cases to deduce how businesses can better block a greater number of malicious insiders. Most insider attacks occur within a narrow window; most people are most likely to strike within 30 days of resignation. Watch for human-behavior warning signs, including resignations, terminations. Train employees to resist recruiters, train them to resist recruiting from outside.”]
Source: https://www.darkreading.com/attacks-breaches/10-best-ways-to-stop-insider-attacks