![]() ![]() ![]() Rule conditionĪ user could modify the properties of a file (for example, re-signing the file with a different certificate).Ī user could move the denied file to a different location and run it from there. The following table details security concerns for different rule conditions with deny actions. For example, if you configure a deny action for a file or folder path, the user can still run the file from any other path. The deny action is generally less secure than the allow action because a malicious user could modify the file to invalidate the rule. Deny rule considerationsĪlthough you can use AppLocker to create a rule to allow all files to run and then use rules to deny specific files, this configuration is not recommended. Because AppLocker functions as an allowed list by default, if no rule explicitly allows or denies a file from running, AppLocker's default deny action will block the file. If you have denied a file from running in a rule collection, the deny action will take precedence over any allow action, regardless of which Group Policy Object (GPO) the rule was originally applied in. When applying rules, AppLocker first checks whether any explicit deny actions are specified in the rule list. You can also create rules that use the deny action. This block by default, allow by exception configuration makes it easier to determine what will occur when an AppLocker rule is applied. Only the files that are listed within the rule collection are allowed to run. Unlike Software Restriction Policies (SRP), each AppLocker rule collection functions as an allowed list of files. This topic explains the differences between allow and deny actions on AppLocker rules. Learn more about the Windows Defender Application Control feature availability. Some capabilities of Windows Defender Application Control are only available on specific Windows versions. ![]()
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