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AlienVault® USM Anywhere™

Suppression Rules from the Orchestration Rules page

  Role Availability   Read-Only   Analyst   Manager

About Suppression Rules

USM Anywhere includes suppression rules to allow 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 AlienVault 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. If you want to display just the suppressed events, see To only display 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.

If you want to see an example of a suppression rule, see Example: Creating a Suppression Rule and Creating a Suppression Rule for VPC Flow Logs.

Managing Suppression Rules

To create a suppression rule from the orchestration rules page

  1. Navigate to SETTINGS > RULES.
  2. Click Create Orchestration Rule > Create Suppression Rule
  3. Type a name for the rule.
  4. Click Add Condition and select the property values you want to include in the rule to create a matching condition.
  5. 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 UUID (Universally Unique Identifier) of the event or alarm. You can use Source Name(s) or Destination Name(s) instead.

  6. You can click Add Group to group your conditions.
  7. Note: See Operators in the Orchestration Rules for further information.

  8. (Optional) To include a multiple occurrence parameter, click the More... link.

    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 SSH Program 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 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.

    • 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.
    • 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 occurrence to the last occurrence. 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 will apply when the configured conditions happen three times every five minutes.

  9. Click Save Rule.
  10. The created rule will display in the list of rules.

To filter suppression rules by name

  1. Navigate to SETTINGS > RULES.
  2. Click Suppression Rules on the left navigation panel.
  3. Click in the box next to Filter by.
  4. Type your search.

To filter suppression rules by rule status

  1. Navigate to SETTINGS > RULES
  2. Click Suppression Rules on the left navigation panel.
  3. Click in the combo box next to Rule Status.
  4. Select All Rules, Enabled, or Disabled.

To edit a suppression rule

  1. Navigate to SETTINGS > RULES.
  2. Click Suppression Rules on the left navigation panel.
  3. Click the Edit icon () of the suppression rule you want to edit.
  4. Modify the data you need to.
  5. Click Save Rule.

To remove a suppression rule

  1. Navigate to SETTINGS > RULES.
  2. Click Suppression Rules on the left navigation panel.
  3. Click the Delete icon () of the suppression rule you want to remove.
  4. A popup window displays to confirm the deletion.

  5. Click Accept.

To enable a suppression rule

  1. Navigate to SETTINGS > RULES.
  2. Click Suppression Rules on the left navigation panel.
  3. Click the ON icon () of the suppression rule you want to enable.

To disable a suppression rule

  1. Navigate to SETTINGS > RULES.
  2. Click Suppression Rules on the left navigation panel.
  3. Click the OFF icon () of the suppression rule you want to disable.

To enable all suppression rules

  1. Navigate to SETTINGS > RULES.
  2. Click Suppression Rules on the left navigation panel.
  3. In the list of rules, click the first box in the first column to select all the suppression rules.
  4. Select the rules you want to enable.
  5. Click Enable All Rules.

To disable all suppression rules

  1. Navigate to SETTINGS > RULES.
  2. Click Suppression Rules on the left navigation panel.
  3. In the list of rules, click the first box in the first column to select all the suppression rules.
  4. Click Disable All Rules.
  5. A warning popup window displays.

  6. Click Accept.