By Daniel Hunter

Businesses are being warned about cyber attacks against hi-tech entrepreneurs and company directors in their hotel rooms.

The 'DarkHotel' hackers hit their targets with undetectable malware when they login to hotel WiFi or connect using an ethernet cable.

It is understood that the technique used puts even encrypted data at risk.

Internet security firm Kaspersky Lab said such attacks started in 2007.

"The fact that most of the time the victims are top executives indicates the attackers have knowledge of their victims' whereabouts, including name and place of stay," Kaspersky Lab said in a statement.

"This paints a dark, dangerous web in which unsuspecting travellers can easily fall."

Its research suggests that the majority of the attacks have taken place in Japan. But hacks have also taken place in Taiwan, mainland China, Hong Kong, Russia, South Korea, India, Indonesia, Germany, US and Ireland.

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