Work and live with IT

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The Hitchhiker's Guide to Microsoft Defender for Endpoint exclusions

Since Microsoft Defender for Endpoint is a suite of products, rather than just one single piece of software, there are various places where you can create exclusions for different features. Also, there are integrations in other products, that result in possible side effects when enabling certain settings. Most of these products have separate documentations, there is no single documentation page that contains all the information about exclusions available in Microsoft Defender for Endpoint.

Azure Attack Paths

Creating and maintaining a secure environment is hard. And with every technology or product added to your environment it gets more complicated. Microsoft Azure as a cloud environment is no exception to this rule and with the many services and features that get added every year it just gets more complicated even if you did not change a thing. Because keeping your IT assets secure is important as you move to the cloud, it is important to know which bad practices to avoid and which attack scenarios are out there.

Latest posts

Passkey Public Preview for Entra ID

With the release of the public preview for Passkey in Entra ID, I think, the broad adoption of passwordless and phishing resistant authentication adoption in the enterprise is coming close. Of course we had phishing resistant, passwordless methods available before. FIDO2 security keys are already a supported way to sign-in to Entra ID. But realistically this was always just for the technical savvy, the admins and power users and there were still limitations on mobile platforms.

Protect your users from Device Code Flow abuse

Device Code Flow is a great feature. You are signed in on a machine that does not have any UI but need to connect to an Azure or Microsoft 365 resource? No problem, device code flow to the rescue. All major PowerShell cmdlets, the az tools and many other tools support this authentication flow. What makes it so flexible and great? You can go to https://microsoft.com/devicelogin enter a generated code that is displayed on another device and sign-in using your normal user and bam, you are in.

Anonymous IP address involving Apple iCloud Private Relay

Since a few weeks I recognized an uptick in Entra ID Protection alerts regarding “Anonymous IP address” detections. Normally this is a high-fidelity indicator that someone is using a Tor browser or some other method to cover their tracks. While this behavior is totally fine in a private setting, in enterprise IT the use of such anonymizers is not considered baseline behavior. While analyzing the related alerts for common patterns I stumbled upon the IP address information.

How to deploy a PowerShell 7.2 runbook to Azure Automation using Bicep

A few months ago in November 2023 PowerShell 7.2 was made “General Available” in Azure Automation. One important feature was yet missing from the documentation: deployment using Bicep or ARM templates. As confirmed by Microsoft, the API was already supporting this behind the scenes. Yes, both Bicep and ARM template support is available. After I checked with a few people to no avail, Jan-Henrik finally gave my the right hint.

Detect threats using Microsoft Graph activity logs - Part 2

In part one I focused mostly on detecting offensive security tools like AzureHound, GraphRunner, and PurpleKnight. In part two I will go into more depth how you can use the now available information for hunting and how to correlate it with other datasets to gain deeper insights. Correlate Graph activities with other log sources While the MicrosoftGraphActivityLogs alone is a trove of information, correlating it with other logs makes it an even more interesting data source.

Detect threats using Microsoft Graph activity logs - Part 1

When working with Microsoft Entra there are many log sources you can use to detect usage and changes to the environment and the assets within it. Most of them can be forwarded using the diagnostic settings to different targets for better analysis capabilities or long term storage. In many cases a Microsoft Sentinel or Log Analytics workspace is the target of choice, but also other SIEM solutions can benefit from this stream of log data.