If you see a token in your Assets screen that you do not recognize, you are not alone.
Some projects send tokens to many wallet addresses - including Ready Wallet accounts - as part of bulk marketing campaigns. This is a common tactic and does not mean your wallet has been compromised.
There is no way to block incoming tokens to Starknet accounts.
To hide an unwanted token:
Go to Settings > Preferences > Hidden and spam tokens and toggle it off.