Dear Blockchain Team, in fact I have been stolen of about 0.04btc, an sms warned and send
 
to me describe that someone send from my wallet! below is the transaction that I have never made:
 
https://blockchain.info/tx/7ccd211dc0dc0d62b21df7ef439678dffd43d1890915357466a2dbb4070992b9
 
the address attack is:1EGjy8WwUFUzBcqnp1R4SPNN4p9s4smWqF
who has stolen from my address of:1BW4GWrYtdTSwHz175D6LSaQuFmrq39dHL
 
I don't know how he could steal my bitcoins? through the wallet login data or my bitcoin private key (although I never see and know my bitcoin private key in the blockchain wallet)? please give me all the details of these to know how to protect my wallet.
 
do you recommend to use this wallet again? I'm afraid now! what do I do?
 
Please help me to refund the 0.04btc.