Dear Bitcointalk Team, in fact, I have been stolen of 0.04 btc and here is the transaction:
7ccd211dc0dc0d62b21df7ef439678dffd43d1890915357466a2dbb4070992b9

although I didn't send any bitcoin from my wallet, how this happens?
and how I protect my wallet from stealers?
 
please help me to reverse and refund them to my address:1BW4GWrYtdTSwHz175D6LSaQuFmrq39dHL

I apologize for any hassle I made, but please help me and tell me to which site I claim my lost bitcoins!

what do I do for the transaction that I have never made!
https://blockchain.info/tx/7ccd211dc0dc0d62b21df7ef439678dffd43d1890915357466a2dbb4070992b9

once again, I apologize for any hassle and trouble I have made to you.