Many Fortune 500 companies which are protected by security vendor Symantec are at risk from a new version of the rinbot virus, it emerged last night.
The virus appears to be deliberately targeted at weaknesses in Symnatec's anti-virus software.
'Traditionally hackers always went after Microsoft's anti-virus programs but now they're targeting other programs such as Symantec's,' said Graham Cluley, a senior technology consultant with Sophos.
'We do know that it has hit CNN Time Warner in the US. That's the most high-profile place but we are aware of it hitting elsewhere,' he said.
The virus exploits security loopholes in anti-virus software and then spreads through the network creating zombies to form a botnet.
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