can i get them back somehow?
Unfortunately this is not easily possible. You could try to trace the address and if you may land on an exchange and you inform your local
law enforcement agency. But this depends on the amount if bitcoins stolen.
can i find him?
You can try to start a blockchain analysis. I think there are quite a few services online. But this costs money.
And you still only can find the "final recieving address". This can, but doesnt have to, lead to a success. Especially with coin mixing services available.
how can i find the malware?
To find the malware your best bet would be to first use a simple av scanner (e.g. malwarebytes anti malware) to scan. Afterwards you should
wipe your hard drive and get a fresh copy of your OS. Until then you should not store any coins on your pc.