Virus scanner in Azure App Service

Mathias Rönnlund

6/7/24, 3:43 PM

Is there any virus scanner installed on Azure App Service machines? When my web application is receiving a file, is it scanned on the wire? Or could I save it to disk, wait 2 seconds and if it disappears, assume that the machine's antivirus had removed it?

If this is not possible by default, would Microsoft Defender for Cloud enable this? It costs 15€/month/App Service so not bad if it contains virus scanning.

1 + 0

anti-virus

azure-app-services

windows-defender

Score:1

Server

HBruijn

6/8/24, 10:42 AM

To long for a comment:

As far as I understand it, anti-malware is hardly ever enabled by default on cloud platforms and services and almost always something that needs to be enabled explicitly/via an add-on.

https://learn.microsoft.com/en-us/azure/security/fundamentals/antimalware seems to suggest that is also the case for Azure services in general.

(The possible issues with enabling anti-malware is that is adds a certain amount of overhead, there is always a risk of false positives and an organisation and their applications need to be aware and respond appropriately when malware gets detected. i.e. Are malware/viruses only to be reported, will the malware get quarantined, or will files get (silently) deleted? Is the sender to be notified, or only the receiver / receiving process? And how? etc. etc.)

When in doubt:

Test!

Upload a file and/or submit data that contains the EICAR test file.

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