Lockheed Martin's information security team claimed the attack was most destructive of all systems and data-owned company.
"Our system remains secure even if we do the actions necessary to protect the network and enhance our IT security," said the company's official statement on Sunday (29 / 5).
The incident is currently under investigation and Lockheed Martin said the company worked together to share information with the institutions of U.S. government security.
But so far the company management have not mentioned the alleged attack.
Although time had an attack, Lockheed Martin said the remains believed a layered security system that applied for this.
Lockheed Martin, based in Bethesda, Maryland, employs 125,000 employees worldwide.
This company focuses on designing, developing and building advanced technology system which includes a number of sophisticated weaponry.
Lockheed Martin is one of the largest defense companies in the world with 74% of 2009 revenues derived from sales of military equipment.
Last year, the company earned income of no less than U.S. $ 48.8 billion, or almost Rp392 trillion.
A number of the company's products include Trident missiles, Orion spy plane, F-16 fighter aircraft and F-22 Raptors as well as military transport plane C-130 Hercules.
In addition to producing military equipment, Lockheed Martin is also working with the U.S. Space Agency (NASA).
One of the projects developed by NASA along with Lockheed Martin is a manned spacecraft, Orion, to carry humans into space is much deeper.
Orion capsule weighing 23 tonnes will initially be used to bring men to the moon and return to earth.
Orion is one of the manned space exploration project launched by President Barack Obama last year. However, the program was halted because of budget shortfalls.
