Everyone wants to receive a free $50 Best Buy gift card and USB drive in the mail, but as the saying goes, nothing is ever truly free.

A cybercriminal gang has put together a unique attack profile based on this human frailty, but one that has been on the scene since the early days of cybercrime. The attack begins with an actual paper letter mailed through the U.S. Postal Service to a specific target that contains a socially engineered message designed to entice recipients to place the USB drive in their computer, according to Trustwave's Spider Lab.

The note says the gift card is thanks for being a great Best Buy customer and that the USB drive contains a list of products that can be purchased with the card. Not surprisingly, there is nothing on the gift card, but the USB does come with a surprise: malware.

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