U.S. Attorney Rod Rosenstein says Makwana was fired Oct. 24.
Rosenstein says that on that day, Makwana programmed a computer with a malicious code that was set to spread throughout the Fannie Mae network and destroy all data this Saturday.
Makwana's federal public defender did not immediately return a call seeking comment.
Washington-based Fannie Mae is the largest U.S. mortgage finance company.
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