This is the first time I've been scammed and I haven't seen any post about this technique before. Like everyone; I see scamming attempts on a daily basis. Send 0.1 ETH and I'll triple it; Visit B1nance.com; Submit your private key here, etc.
I thought I was pretty good at recognizing them. When I'm bored; I participate in a lot of airdrops so I have a spam email account for that purpose. Last week; I received an email that I had won some tokens in an airdrop.
The organizer send me an email with a public/private key to an ETH address with ~$5,- in tokens on it (not ETH, different ERC20 tokens). There was no ETH to pay the fee to get it out. I transferred ~0.001 ETH from my own account to cover the transfer fees but a bot immediately transferred the full amount to the next address.
Looking more closely, I actually noticed several other small ETH deposits made that day and immediately getting transferred out.
It isn't the most profitable scam (most people transfer $1-10,-) but it was a new one for me.
NEVER transfer any currency to an address if someone generated the private key. It's tempting to see $5,- in an address when you hold the private key; but you'll just lose whatever you send there to cover transaction fees.
Firstly, I thank you for bringing this information to the notice of members of this forum, this is a warning signal to all of us, scammers are devising several strategies or means of stealing people's hard earned token via scrupulous means having been using phished MEW to steal people's private keys on daily basis.