I am pretty sure that SiaCoins were stolen from my SiaUI Wallet.

[c35punk]

Hello,
I have logged in today in my Sia UI Wallet for the first time in a while (last maybe a month ago) only to discover that there are 9965 SiaCoins missing with a Tx dated 30.08.2017. The funny thing is that this is the same amount as the one that I sent to my Sia UI from my exchange wallet...
Sia UI is fully synced but no trace of my SCs...

Here's the transaction ID:
https://explore.sia.tech/hash.html?hash=90fceee488e7b120b50caa0792b63a0df44bd26d5731b1a9369baf5bb8f79646

Keep in mind that I DIDN'T SENT THOSE SCs...
Is there a way for a hacker to exploit Wallet date through SiaExplorer and using only Tx IDs and Public addresses?

Any suggestions?

https://imgur.com/a/LHLJg