Mainstream support for Microsoft Advanced Threat Analytics (ATA) ends in three months

We’ve helped organizations embrace Microsoft’s Advanced Threat Analytics (ATA) solution to protect their Active Directory environments from attacks. On January 12th, 2021, mainstream support for this product ends. ATA version 1.9.3, released on September 14th, 2020 is the final update as part of mainstream support. It’s time to move on to Microsoft Defender for Identity. … Continue reading "Mainstream support for Microsoft Advanced Threat Analytics (ATA) ends in three months"

Field Notes: DKIM and missing selector records

During a project with one of my customers, I was tasked to look at a non-delivery report (NDR) for a mail message. The bounce error was pretty confusing, but after reviewing the headers, we noticed that the DKIM check had failed. This was a bit of a surprise, because the message was sent from Microsoft … Continue reading "Field Notes: DKIM and missing selector records"

HOWTO: Harden Remote Desktop connections to Domain Controllers

Workstations that are allowed to communicate to Domain Controllers pose a risk of lateral movement. To mitigate some of these risks, we can harden the Remote Desktop connections to Domain Controllers. Note: For organizations that have implemented the Active Directory administrative tier model, or are striving to embrace, their Privileged Access Workstations (PAWs) pose a … Continue reading "HOWTO: Harden Remote Desktop connections to Domain Controllers"

Quick tips to limit sending mail to the wrong recipient

Embarrassing The Dutch Data Protection Agency (Dutch: Autoriteit Persoonsgegevens) is responsible for the supervision of correct handing of personal data. This agency must be informed when there is a breach with personal data. It’s the agency that has its duties described within GDPR. So, it is extra painful when they themselves are responsible of a … Continue reading "Quick tips to limit sending mail to the wrong recipient"

HOWTO: Enable Extended Protection for Authentication on the SQL Servers hosting the AD FS and Azure AD Connect databases

Most Microsoft-based Hybrid Identity implementations use Active Directory Federation Services (AD FS) Servers, Web Application Proxies and Azure AD Connect installations. In this series, labeled Hardening Hybrid Identity, we’re looking at hardening these implementations, using recommended practices. In the pervious post of this series, we discussed encrypting traffic between AD FS Servers, servers running Azure … Continue reading "HOWTO: Enable Extended Protection for Authentication on the SQL Servers hosting the AD FS and Azure AD Connect databases"

HOWTO: Set an alert to notify when an additional person is assigned the Azure AD Global Administrator role

Azure Active Directory is Microsoft's Identity Management-as-a-Service solution, offering seamless access, easy collaboration, efficiency in IT processes and improved security and compliance. User objects with the Global administrator role are the highest privileged objects in Azure AD and should be monitored.   The challenge with Global Admins Some organizations have opted for a Technical State … Continue reading "HOWTO: Set an alert to notify when an additional person is assigned the Azure AD Global Administrator role"

How To: Exchange Authentication Policies

There are several ways how you can protect and limit access to Exchange Online. Conditional Access, Client Access Rules, the older ActiveSync Device rules and, the topic of this post, Authentication Policies. These policies are available in Exchange Online and Exchange Server 2019 since CU2. This article will show you how to implement this. Why … Continue reading "How To: Exchange Authentication Policies"

HOWTO: Disable Office for the Web for your Microsoft 365 users

Office for the Web (previously known as Office Web Apps) is one of the nicest features in Microsoft 365. It allows people to view and interact with documents in their web browser, without the need to install or use any of the native Microsoft 365 apps. Alas, there are some privacy concerns, and some organizations … Continue reading "HOWTO: Disable Office for the Web for your Microsoft 365 users"

HOWTO: Set an alert to notify when an Azure AD emergency access account is used

Azure Active Directory is Microsoft's Identity Management-as-a-Service solution, offering seamless access, easy collaboration, efficiency in IT processes and improved security and compliance. For administrative access at al times and under all circumstances, Microsoft recommends to create at least one emergency access account in Azure Active Directory when an organization has Azure AD Premium P1 and/or … Continue reading "HOWTO: Set an alert to notify when an Azure AD emergency access account is used"

Security Officer: Please block the iOS native mail app (for) now!

Last week an announcement was made: The native mail app in Apple's iOS has zero-day vulnerabilities, deemed critical. No patch is available at this time. More information about the vulnerability can be found here. For you as IT admin this means that you probably have work to do. The main questions you may be facing … Continue reading "Security Officer: Please block the iOS native mail app (for) now!"