Define External Media Restrictions

Malicious code can gain access to endpoints through external media, such as removable drives and optical drives. To protect against this type of attack, you can define restriction rules that prevent executable files from running on external drives that are attached to your endpoints. Defining a restriction on external media protects against any attempt to launch an executable file from an external drive.
  1. Begin a new restriction rule:
    1. Select PoliciesMalwareRestrictions.
    2. From the action menu manage-hidden-menu-icon.png , Add a new restriction rule.
    3. Select External Media.
  2. Select the type of external media from which you want to restrict executable files from running, either Removable Drives or Optical Drives. By default, running non-malicious and unknown applications from removable and optical drives is allowed.
  3. (Optional) Add Conditions to the Rule. By default, a new rule does not contain any conditions.
    To specify a condition, select the Conditions tab, select the condition in the Conditions list, and then Add it to the Selected Conditions list. Repeat this step to add more conditions, as needed. To add a condition to the Conditions list, see Define Activation Conditions for a Rule on Windows Endpoints.
  4. (Optional) Define the Target Objects to which to apply the restriction rule. By default, a new rule applies to all objects in your organization.
    To define a subset of target objects, select the Objects tab, and then enter one or more Users, Computers, Groups, Organizational Unit, or Existing Endpoints in the Include or Exclude areas. The Endpoint Security Manager queries Active Directory to verify the users, computers, groups, or organizational units or identifies existing endpoints from previous communication messages.
  5. (Optional) Review the rule name and description. The ESM Console automatically generates the rule name and description based on the rule details but permits you to change these fields, if needed.
    To override the autogenerated name, select the Name tab, clear the Activate automatic description option, and then enter a rule name and description of your choice.
  6. Save the restrictions rule.
    Do either of the following:
    • Save the rule without activating it. This option is only available for inactive, cloned, or new rules. When you are ready to activate the rule, select the rule from the PoliciesMalwareRestrictions page and then click Activate.
    • Apply the rule to activate it immediately.
    After saving or applying a rule, you can return to the Restrictions page at any time to Delete or Deactivate the rule.
  7. (Optional) To whitelist specific external media locations from your external media restriction rule, add one or more folders to the External Media Whitelist. For more information, see Manage Global Whitelists.

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