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
      Policies
      Malware
      Restrictions
      .
    2. From the action menu ,
      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. You can also define new Conditions.
  4. (
    Optional
    ) Define the Target Objects to which to apply the rule.
    To define a smaller subset of target objects, select the
    Objects
    tab, and then enter one or more
    AD Users
    ,
    AD Computers
    ,
    AD Groups
    ,
    AD Organizational Unit
    ,
    Existing Endpoints
    , or
    Existing Groups
    in the Include or Exclude areas. The Endpoint Security Manager queries Active Directory to verify the users, computers, groups, or organizational units. The ESM Console also offers autocompletion as you type for existing endpoints and existing virtual groups.
  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
      Policies
      Malware
      Restrictions
      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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