FBI warning issued based on recent destructive Malware used in USA cyberattacks last week. 

http://www.msn.com/en-us/news/technology/exclusive-fbi-warns-of-destructive-malware-in-wake-of-sony-attack/ar-BBgd4ot

QUOTE:  The Federal Bureau of Investigation warned U.S. businesses that hackers have used malicious software to launch a destructive cyberattack in the United States, following a devastating breach last week at Sony Pictures Entertainment.

Cybersecurity experts said the malicious software described in the alert appeared to describe the one that affected Sony, which would mark first major destructive cyber attack waged against a company on U.S. soil. Such attacks have been launched in Asia and the Middle East, but none have been reported in the United States. The FBI report did not say how many companies had been victims of destructive attacks.

The report said the malware overrides all data on hard drives of computers, including the master boot record, which prevents them from booting up. “The overwriting of the data files will make it extremely difficult and costly, if not impossible, to recover the data using standard forensic methods,” the report said. Security experts said that repairing the computers requires technicians to manually either replace the hard drives on each computer, or re-image them, a time-consuming and expensive process.