"I want to buy your item but do not have time to pick it up, so I will send a postman who delivers money to you."

In recent months, posts from people contacted by buyers like these have flourished on social media.

Since buyers claim to use regular bidding companies such as Fedex, UPS and GLS, some have turned to various forums and asked if this might be true.

- There is not a single distributor who sends a postman to you to deliver money so that a buyer can buy an item.

If you are unsure, you can google the bids they claim to use and see that the companies themselves warn of fraud of this type, says Olsson.

According to Jan Olsson, the scam happens in the same way as with regular phishing attacks, but the fraudsters take a slightly longer route to reach their goal.

- This is advanced phishing.

In regular phishing attacks, fraudsters try to get one to click on links and give out their information by sending out mass emails and claiming to be from one's bank.

But this is much more sophisticated.

See how the scam works in the clip above.