Malware 'Unscannable' was detected and blocked / *ALERT* Sophos XG Firewall - HTTP virus detected

Hi everyone, 

We are getting thousands of alerts from our Sophos XG at the moment, and with the below error alert ID and message:

Any possible causes of this?


Alert ID: 8001

Message:
Malware 'Unscannable' was detected and blocked in a download from tbt.unifi-controller.prc.com



Added TAGs
[edited by: emmosophos at 4:58 PM (GMT -7) on 8 Oct 2022]