Automatic updates

If you observe that your Azure functions have been updated by File Storage Security, this is expected behavior.
The Trend Micro backend service regularly pushes updates to File Storage Security stacks on Azure.
Automatic update
Stack
Azure component
When
Licence
Scanner
KeyVault secret
Weekly
Function (feature)
Scanner; storage (two Functions)*
Function code
Whenever the code is patched (see What's New)
Security update: malware patterns
Scanner
Function configuration
Daily
* Scanner Function in scanner stacks; Blob Listener Function and Post Scan Action Tag Function in storage stacks