For example, the following SDDL string denies execute access to any signed programs published by Contoso for the user account RestrictedUser (identified by the user’s SID): D:(XD FX S-1-5-21-3392373855-1129761602-2459801163-1028 ((Exists APPID://FQBN) For example, a rule could be created to “Allow all versions greater than 9.0 of Contoso Reader to run” or “Allow anyone in the graphics group to run the installer or application from Contoso for GraphicsShop as long as the version is 14.*”. Rules can be created using the following criteria:įields within a code-signing certificate embedded within the file, allowing for different combinations of publisher name, product name, file name, and version. Another useful rule would be to prevent users in the Receptionists group from installing or running unapproved software.ĪppLocker rules depend upon conditional ACEs and attributes defined by AppID. For example, you can create a rule to “Allow users in the Finance security group to run the finance line-of-business applications.” This blocks everyone who is not in the Finance security group from running finance applications (including administrators) but still provides access for those that have a business need to run the applications. This allows an administrator to support compliance requirements by validating and enforcing which users can run specific applications. Using an exception, you could create a rule to “Allow everything in the C:\Windows or C:\Program Files directories to be run, except the built-in games.”ĪppLocker rules can be associated with a specific user or group. “Deny” rules take precedence over “allow” rules.Įach rule can also have a list of exceptions to exclude files from the rule. There are two types of rules in AppLocker:Īllow the specified files to run, denying everything else.ĭeny the specified files from being run, allowing everything else. MSP) for both install and uninstallĪppLocker provides a simple GUI rule-based mechanism, which is very similar to network firewall rules, for determining which applications or scripts are allowed to be run by specific users and groups, using conditional ACEs and AppID attributes. AppLocker auditing mode can be used to monitor which applications are being used by one, or more, users on a system.ĪppLocker allows an administrator to restrict the following types of files from being run: Another feature that makes AppLocker superior to SRP is AppLocker’s auditing mode, which allows an administrator to create an AppLocker policy and examine the results (stored in the system event log) to determine whether the policy will perform as expected-without actually performing the restrictions. If both AppLocker and SRP rules are in the same Group Policy object (GPO), only the AppLocker rules will be applied. (All users were affected by SRP rules.) AppLocker is a replacement for SRP, and yet coexists alongside SRP, with AppLocker’s rules being stored separately from SRP’s rules. Windows XP introduced Software Restriction Policies (SRP), which was the first step toward this capability, but SRP suffered from being difficult to manage, and it couldn’t be applied to specific users or groups. New to Windows 7 and Windows Server 2008/R2 (Enterprise and Ultimate editions) is a feature known as AppLocker, which allows an administrator to lockdown a system to prevent unauthorized programs from being run.
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