There is no way for anyone to spent your bitcoins unless your wallet password is compromised which in turn means your machine has been compromised, probably with malware, are you sure you did not accidentally sent this tx https://blockchain.info/tx/995591fc0a407c52c6b8e791dd6e095d237e1e1dad2673e0c2f25e6e43aabe87 to 1LvKgYwaoemuUiGyueTAHJFQrRtJyJe4qB, the particular tx was sent with super high fees too, probably malware.
Hey thanks for the fast reply! No the address ending UccY was definitely the last output I made. Is there anyway to recover these coins or have I been beaten? Im using mac, how would i go about removing any malware? Also if the coins successfully went from my wallet to the uccY wallet successfully doesnt it mean the UccY destination contains the malware?
Is there any other possibilities other than malware? I would be extremely surprised if the final wallet destination was attacked with malware although it is possible