![]() ![]() However, enabling EnableFileHashComputation may impact device performance. If the EnableFileHashComputation group policy is disabled, the blocking accuracy of the file IoC is reduced.In all other cases, if conflicting file IoC policies with the same enforcement target are applied to all devices and to the device's group, then for a device, the policy in the device group will win.This is always true regardless of the device group. An SHA-256 file hash IoC policy will win over an SHA-1 file hash IoC policy, which will win over an MD5 file hash IoC policy if the hash types define the same file. If there are conflicting file IoC policies with the same enforcement type and target, the policy of the more secure hash will be applied.Typically, file blocks are enforced and removed within a couple of minutes, but can take upwards of 30 minutes.Supported on devices with Windows 10, version 1703 or later, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, and Windows Server 2022. For more information, see Manage cloud-based protection. This feature is available if your organization uses Microsoft Defender Antivirus (in active mode) and Cloud-based protection is enabled. ![]() It's important to understand the following prerequisites prior to creating indicators for files: By creating an indicator through the Indicator API. ![]() By creating a contextual indicator using the add indicator button from the file details page.By creating an indicator through the settings page.There are three ways you can create indicators for files: This operation will prevent it from being read, written, or executed on devices in your organization. If you know a potentially malicious portable executable (PE) file, you can block it. ![]() Prevent further propagation of an attack in your organization by banning potentially malicious files or suspected malware. Want to experience Defender for Endpoint? Sign up for a free trial. ![]()
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