Recently, multiple suspicious user accounts were created on Less Wrong. These accounts don't post any content in the forum. Instead, they are used only to send private messages to the existing users.

Many users have received a copy of the same message, but different variants exist, too. Here are the examples I know about. If you have received a different variant, please post it in a comment below this article:

Hi good day. My boss is interested on donating to MIRI's project and he is wondering if he could send money through you and you donate to miri through your company and thus accelertaing the value created. He wants to use "match donations" as a way of donating thats why he is looking for people in companies like you. I want to discuss more about this so if you could see this message please give me a reply. Thank you!

I don't know yet about anyone who replied and got scammed, so this is all based on indirect evidence. If you got scammed, please tell me. If you are ashamed, I can publish your story anonymously. Your story could help other potential victims.

Most likely, the scheme is the following:

1. The scammer will send you money.
2. Then they will ask some of the money back because they changed their mind, or they mistakenly sent you more than they wanted, or their financial situation suddenly changed, or whatever.
3. After receiving the money from you, they will flag the original transaction as a fraud, so they get back the money they originally sent you, plus the money you sent them back. Then they disappear, or it will turn out they used a stolen identity, etc.

(Thanks to ChristianKl for explaining the system in the Open Thread.)

If you replied to the original message and now you are already in the middle of the process, please inform your bank as soon as possible! Even if the step 2 didn't happen yet, so you can still get out without losing money, warning your bank about the scammer could help other potential victims.

Warning: If you have already received a check or a payment confirmation, and someone is asking you to send the overpayment back quickly, do not send anything. The check or the payment confirmation is fake, and the goal is to make you send money before you find out. (Thanks to qsz for explaining.)