Security experts are warning of hoax emails informing recipients that they have won a cash prize in a lottery.
The emails typically ask the recipient to give their bank details so they can claim the prize. The messages also contain a phone number in an attempt to convince the victim that the email is genuine.
The telephone numbers used are the popular '070' numbers - these look like mobile phone numbers but in reality they can be acquired by anyone for free and redirected to any number the owner wishes, according to security firm Sophos.
"Scammers... can easily cycle through a bunch of these 'throw-away' numbers, using them to con innocent victims into revealing confidential information that can then be used to empty bank accounts and commit identity theft," said Graham Cluley, senior technology consultant at Sophos.
"With 070 numbers, callers have no way - short of persuading the 070 service provider to tell them - to determine where their call ends up. They may think they are speaking to an official in London, when really they're on the phone to a scammer in Lagos," continued Cluley.
Sophos is advising users to be wary of any email telling them that they have won a prize or asking them to reveal their bank details.
http://www.sophos.com/