"With promises of daily returns of 5%-10 %"
No cryptocurrency can promise any returns in terms of fiat money.
If someone is trying to sell you their coins, I would head back to bitcointalk.org and do a search for the ticker name in the top right search bar...
https://bitcointalk.org/index.php?board=159.0

If its not listed here, I would stay away.
But, that, is just me.