I checked the addresses I used so far but did not recognize any of them in the transaction. Also 13QSnhZrKYpHkbxuKiXaEwqVFgsSfB7Gi9 isn't one of my addresses.
My confusion starts with the second transaction. The first transaction is totally fine. But I never (at least knowingly) made the transfer to the red address. And it does not show up as a receiving address in my wallet either (change address).
1LAwJ5N8Mn3p4pfSMLy9rqoYv1Jqyen8Dv 1GXSMQhfi66AGwUNibEFmrR3USDZ57Y8fs 5 BTC
13QSnhZrKYpHkbxuKiXaEwqVFgsSfB7Gi9 5 BTC
I had my hard drive offline for several years and after plugging it to my new computer and transferring the wallet.dat to the new hard drive the issue appeared. But according to blockchain.info the BTC were already transferred on 2013-12-04 to this other address with this very last transaction I made.
Before that transaction I made the following one:
1DyYLZvhMLFosuFZj3YyhSF1QsoekVkUtK 1GXSMQhfi66AGwUNibEFmrR3USDZ57Y8fs 10 BTC
1LAwJ5N8Mn3p4pfSMLy9rqoYv1Jqyen8Dv 10 BTC
Here the change address 1LAwJ5N8Mn3p4pfSMLy9rqoYv1Jqyen8Dv was generated and I could use it for the transaction above. The other change address 13QSnhZrKYpHkbxuKiXaEwqVFgsSfB7Gi9 never showed up as a receiving address in my wallet.
Is there any known scam that works like this to steal BTC?