CXmal/WebAgnt-A continuously intercepted by Sophos on Exchange Server 2019- How I can stop this?

Hi, 

I keep receiving this notification on Sophos. So far, I'm running Exchange Server 2019 on VM Host. 

The error mentioned this path on C drive: inetpub\wwwroot\aspnet_client\nzkqhfcsjpl.aspx.

The .aspx name are not consistent. I'm not receiving this error everyday but, still too many times per month.

Security Update for Exchange is the latest KB5015322. 

Perhaps anyone can share your experience on facing this issue. 

Thank you.