Emails have been spammed out directing computer users to a spoofed copy of Google's front page with a large message claiming that they have "won $400".
When users try to get the money they are asked to enter their credit card number and shipping address and await payment.
Ross Paul, product manager for Websense EMEA, said: "It is amazing how stupid people can be when they think there's free money involved, and the scammers only have to get lucky a few times."
"I suppose Google makes the possibility more realistic because people know that the company has a lot of money at the moment."
The spoof website was hosted in the US and was shut down within 24 hours of the emails being detected. It is not known how many people were suckered into the scam.
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