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The Federal Bureau of Investigation on Monday said that a federal jury has convicted Rajendrasinh Babubhai Makwana, a Maryland computer programmer, with "computer intrusion arising from the transmission of malicious script to Fannie Mae's computer servers." He faces a maximum prison sentence of 10 years.

According to the FBI, Makwana worked as a contract Unix engineer for Fanny Mae -- aka the Federal National Mortgage Association, a federally chartered corporation that purchases mortgages -- for three years, and had access to the organization's network of almost 5,000 servers.

Trial testimony detailed how Makwana was fired on October 24, 2008, and ordered to return all Fannie Mae-issued IT equipment, including his laptop. Five days later, however, "a Fannie Mae senior engineer discovered a malicious script embedded in a routine program," said the FBI.

"A subsequent analysis of the script, computer logs, Makwana's laptop, and other evidence revealed that Makwana had transmitted the malicious code on October 24, 2008, which was intended to execute on January 31, 2009," said the FBI. "The malicious code was designed to propagate throughout the Fannie Mae network of computers and destroy all data, including financial, securities, and mortgage information."

On that day, upon trying to log in to the Fannie Mae network, users would have received a message saying only "server graveyard."

The attack is a reminder of the danger of insider attacks, and highlights how, even though the erased data would likely have been restored, the incident would still have disrupted the organization's operations.

"Even though it would be likely that the firm would have off-site backups that would not have been hit by the malware attack, it would still have been enormously disruptive for the company, at a time when confidence in the financial industry was quite rocky anyway," said Graham Cluley, senior technology consultant at Sophos. "Indeed, the court heard evidence that it would take a week for the company to get its systems back up and running again."

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