In January, a highly sophisticated attack targeted reporters at the New York Times in a breach that lasted months on the newspaper giant's systems. Once inside, the attackers used the valid credentials to remain stealthy on the systems, slipping past corporate antivirus and other security systems. The attackers used 45 pieces of custom malware and accessed the computers of 53 Times employees. Once inside, the attackers moved to a domain controller containing the database of hashed passwords of every Times employee. For all intents and purposes, they had the keys to the kingdom, security experts said.