The
US Federal Bureau of Investigation (FBI) has warned that cyber-hackers have
used malicious software to launch destructive attacks in the US.
A
five-page confidential warning was issued to US businesses on Monday, according
to Reuters news agency.
The
software would make it impossible to recover any lost data, the FBI said.
The
warning follows a confirmation from the FBI that it is investigating last
week's hack into Sony Pictures Entertainment's network.
Sony
Pictures was forced to
shut down its corporate network in the attack and some
of its unreleased films have also been leaked online.
But
the warning from the US authorities did not name any victims that have been
targeted.
Instead,
it provided some technical details about the malicious software and advice on
how to handle such an attack.
There
have been accusations that North Korea may have been responsible for the attack
on Sony Pictures after the country's government described a film due to be
released by the studio on Christmas Day as an "undisguised sponsoring of
terrorism as well as an act of war".
The
Interview, starring Seth Rogan and James Franco, tells the story of a CIA plot
to assassinate the North Korean leader.
Pyongyang
has written letters to the UN Secretary General and President Barack Obama
asking for the film to be blocked, but when asked if it was involved in the
cyber-attack on Sony, a spokesman only said "wait and see".
Sony
has not accused North Korea of involvement and said it was investigating the
source of the hacking.
BBC
Business
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