Cybe1

I have premium eset only on OS X disc but not on the new win10 install. I am running a few experiments on my Win10 on iMac. My OS X has premium eset for Mac and a fully encrypted disk. If by chance my desktop is infected by malware, is there a chance it could be encoded to gain access to my OS X? What security measures do you recommend to counter such a possibility (if any)? Thank you