Is my account compromised already?

I had about $10 ETH from a test transfer (Coinbase) a couple of weeks ago. Today, I transferred in about 0.4 ETH. Immediately the combined total left to another address. Of course I would like to know what happened. Thank you

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0x17426fcb9b7cc8d5dc8e19c6a6df4a020d1b8abd06be1d6871ac790e1bb79737. Went out instantly on this transaction. What gives? Thank you