Lockheed officials said that the company had taken immediate actions to prevent the data breach. But company's spokesman Jeffery Adams refused to comment on measures taken in response to the cyber attack.
"However, to counter any threats, we regularly take actions to increase the security of our systems and to protect our employee, customer and program data," Jeffery Adams said. "We have policies and procedures in place to mitigate the cyber threats to our business, and we remain confident in the integrity of our robust, multilayered information systems security."
Lockheed Martin is US' largest military contractor and manufacturer of sophisticated weapons and fighter jets like F-35 Joint Strike Fighter and the F-22 Raptor.
Citing a "person familiar with the situation," Wall Street Journal reported that many Lockheed employees were asked to change their "SecurID" passwords and to reset all passwords used throughout the entire company. Lockheed also disabled remote access to security systems.
Hacking attempt on Lockheed occurred one month after hackers infiltrated to Sony's online gaming service, PlayStation Network and Qriocity. Sony pulled these services offline after confirming the intrusion. Cyber attack on Sony compromised millions on users' personal data, including credit card numbers and passwords.