What about installing an Antivirus on Windows K8s nodes?
I don't have much experience with Symantec (I don't really like the product).
But searching on Google apparently has some steps to set up, as they don't natively support Kuberentes as an application.

Look if these two articles can help you.

https://support.symantec.com/us/en/article.tech246815.html

https://www.symantec.com/content/dam/symantec/docs/solution-briefs/securing-containers-think-your-containers-are-secure-en.pdf