AlienVault® USM Anywhere™

Suppression Rules from the Orchestration Rules page

Role Availability Read-Only Analyst   Manager

About Suppression Rules

USM Anywhere includes suppression rules which enable you to manage false positiveA condition that is flagged as a vulnerability or weakness that is not actually a concern. This may be caused by other mitigating conditions (such as additional security technology) or inefficient tuning on detection technology. alarmsAlarms provide notification of an event or sequence of events that require attention or investigation. and eventsAny traffic or data exchange detected by AT&T Cybersecurity products through a sensor, or through external devices such as a firewall.. After you have confirmed that these issues do not pose a security threat, create a suppression rule to prevent them from displaying in the UI, and avoid noise in your system.

You can create a suppression rule from the details page of an event (Viewing Event Details) or from the details page of an alarm (Viewing Alarm Details). This functionality works the same way, and the Create Rule popup window is similar when you are creating a rule either from a detail page or from the system configuration window. Although it is not a rule, you can also suppress a specific event. See Suppressing/Unsuppressing Events.

Important: The easiest way to configure a suppression rule is from the Events details page (see Creating Suppression Rules from the Events Page) or from the Alarms details page (see Creating Suppression Rules from the Alarms Page).

Note: USM Anywhere saves the events that match a suppression rule, but does not correlate these suppressed events. By default, USM Anywhere hides these suppressed events. If you want to see these events, click Suppressed in the Search & Filters area. The suppressed events will be displayed in the table along with all events. See To only display the suppressed events if you want to display just the suppressed events.

Note: The suppression rule you create will apply to future items. It also will apply to items of the current day, up to 10K events/alarms.

See Example: Creating a Suppression Rule for Sudo Events and Example: Creating a Suppression Rule for VPC Flow Logs if you want to see an example of a suppression rule.

Managing Suppression Rules

To create a suppression rule from the orchestration rules page

  1. Go to Settings > Rules.
  2. Select Create Orchestration Rule > Create Suppression Rule.
  3. Create a suppression rule

  4. Enter a name for the rule.
  5. Click Add Condition and select the property values you want to include in the rule to create a matching condition.
  6. Note: If the field is related to the name of a country, you should use the country code defined by the ISO 3166.

    Note: Keep in mind that the Sources or Destinations field needs to match the universally unique identifier (UUID) of the event or alarm. You can use the Source Name or Destination Name field instead.

  7. (Optional.) Click Add Group Of Conditions to group your conditions.
  8. Note: See Operators in the Orchestration Rules for more information.

  9. (Optional.) Click the More link to include a multiple occurrence parameter.

    These options function together to specify the number of occurrences within a time period that will produce a match for the rule. For example, you can define a rule to trigger an alarmAlarms provide notification of an event or sequence of events that require attention or investigation. for an unauthorized accessAn incident-type categorization that may be a precursor to other actions or stages of an attack. attempt when a failed SSHProgram to securely log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another through Secure Copy (SCP). loginLog in (verb): Process in which an individual gains access to a computer system after providing sufficient credentials to authenticate their unique identity. Login (noun): User credentials, typically a username and matching password. occurs three times within a five-minute window. These are the two options that you can modify:

    • Occurrences: Specify the number of event occurrences that produce a match on the conditional expression to trigger the rule. You can enter the number of occurrences or use the arrow to scroll the value up or down. You need to enter a number between 1 and 100.
    • Length: Specify the length of the window used to identify a match for multiple occurrences. Enter the number and choose a time-unit value of seconds, minutes, or hours.

      This duration identifies the amount of time that transpires from the first to last. If the number of occurrences is not met within this period, the rule is not a match.

      Specify multiple occurances to match for the rule

    In this example, the rule applies when the configured conditions happen five times every three hours.

  10. Click Save Rule.
  11. The created rule displays in the list of rules.

To filter suppression rules by name

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. Click the box next to Filter by.
  4. Enter your search.

To filter suppression rules by rule status

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. Click the combo box next to Rule Status.
  4. Select All Rules, Enabled, or Disabled.

To edit a suppression rule

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. Click the icon of the rule you want to edit.
  4. Modify the data of the items that need to be modified.
  5. Click Save Rule.

To delete a suppression rule

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. Click the icon of the rule you want to delete.
  4. Confirm by clicking Accept.

To enable a suppression rule

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. Click the icon of the rule you want to enable.

To disable a suppression rule

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. Click the icon of the rule you want to disable.

To enable all suppression rules

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. In the list of rules, select the first checkbox in the first column to select all the rules.
  4. Click Enable All Rules.

To disable all suppression rules

  1. Go to Settings > Rules.
  2. On the left navigation panel, click Suppression Rules.
  3. In the list of rules, select the first checkbox in the first column to select all the rules.
  4. Click Disable All Rules.
  5. Confirm by clicking Accept.