Applocker9/17/2023 ![]() ![]() ![]() ĭuplicate indicators count towards the 15, 000 indicator limit per tenant but result in the duplicate indicator’s policy not being enforced. Let’s go over a few examples of duplicate indicators and ways to identify and remove them. ![]() Other enterprise customers have opted to directly import indicators from third party intelligence feed APIs such as PhishTank and Phishunt. They import the previous few days' worth of indicators, set the action to block these indicators, generates alerts, and set an expiration date of 3 days. Then, after the expiration date has passed, they push a new set of indicators from the previous few days. ![]() MISP is a free, open-source platform to share indicators and it consolidates many TI feeds. Many of our customers use custom IoCs to ingest third party TI feeds. For example, many of them integrate MISP with Microsoft Defender for Endpoint. To import third party TI, either use the indicator API or upload a csv file through the portal. Set the expiration date to a few days in advance and once the expiration date passes, import a fresh set of indicators from the previous few days. Setting an expiration date can also remove aged indicators that are more likely to have already been blocked by Defender Antivirus, and can make room for newer intelligence. We recommend setting an expiration date when ingesting recently added or relevant indicators to your organization to minimize the common overlap between third party TI and Microsoft TI that feeds solutions like Microsoft Defender for Endpoint. Custom IoCs provide the ability to import these feeds and block or monitor these entities. Ingesting these feeds can enrich your cybersecurity telemetry and give your devices an extra level of security. Third party threat intelligence ( TI ) can give insight into recently released malware or malicious websites. Set an expiration date when importing new indicators According to the conflict handling guidance, the custom IoC will win over ASR and web content filtering rules and Microsoft Defender Antivirus and SmartScreen ratings. Additionally, you can keep your ASR or web content filtering rules but exclude certain entities that would have been blocked by those rules. If there is an entity that is blocked by Microsoft Defender Antivirus or SmartScreen that you do not want blocked on your devices, you can add a policy to allow for the entity you want to unblock. Īllow IoC is used for exclusion management. We recommend that you limit the number of allow IoC policies that bypass Microsoft Defender Antivirus, SmartScreen, attack surface reduction (ASR ), or web content filtering blocks. In this blog, we will discuss recommendations for using custom IoCs to maximize their capabilities. In addition, we will provide recommendations for customers who ingest large threat intelligence (TI) feeds (beyond our limit of 15,000 indicators per tenant) or have more complex rules. However, note that the more indicators are added, the more management is needed.Įach time an IoC is allowed, it opens new attack vectors as well as increases the IoC count. However, the SRP Basic User feature isn't supported on the above operating systems.Custom indicators of compromise (IoC) are an essential feature for every endpoint solution. Custom IoCs provide SecOps with greater capacity to fine-tune detections based on their organization’s particular and contextualized threat intelligence. Microsoft Defender for Endpoint supports a robust and comprehensive custom IoC platform. Software Restriction Policies can be used with those versions. Windows Server 2008 R2 for Itanium-Based SystemsĪppLocker isn't supported on versions of the Windows operating system not listed above. Windows Server 2019 Windows Server 2016 Windows Server 2012 R2 Windows Server 2012 Policies deployed through MDM are supported on all editions.Policies deployed through GP are only supported on Enterprise and Server editions.Windows versions older than version 2004, including Windows Server 2019: Policies are supported on all editions Windows 10 version 2004 and newer with KB 5024351. Packaged apps Executable Windows Installer Script DLL The following table shows the Windows versions on which AppLocker features are supported. As of KB 5024351, Windows 10 versions 2004 and newer and all Windows 11 versions no longer require a specific edition of Windows to enforce AppLocker policies Operating system requirements ![]()
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