Example: Creating a Suppression Rule for Sudo Events

Role Availability Read-Only Investigator Analyst Manager

In this example, we are going to create a suppression rule to avoid having a lot of sudo A program for UNIX-like computer operating systems that allows users to run programs with the security privileges of another user, by default the superuser. events Any traffic or data exchange detected by LevelBlue products through a sensor or external devices such as a firewall.. You can create this rule whenever you trust the origin host Reference to a computer on a network., or because you need to do maintenance. This way you will avoid noise in your list of events.

Note: You can also create your own rules from the Events page, which is an easier way to configure the matching conditions. See Creating Suppression Rules from the Events Page for more information.

To create a suppression rule for avoiding Sudo events

  1. Go to Settings > Rules.
  2. Select Create Orchestration Rule > Suppression Rule.
  3. Select a Boolean operator.

    The options are AND, OR, AND NOT, and OR NOT.

  4. Select a packet type in the Match drop-down list.

    Match Drop Down List

  5. Select these property values:

    Create a suppression rule for avoiding SUDO events

  6. Click Next.

    Rules Verifications Dialog Box

    Important: A dialog box opens if there are warning messages. Click Cancel to review the warning messages, or click Accept to continue creating the rule.

  7. Enter a name for the rule, (for example, Suppress Sudo Events).
  8. (Optional.) Enter a description for identifying this rule.
  9. Modify these two options:

    • 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 timespan used to identify a match for multiple occurrences. Enter the number and choose a value of seconds, minutes, or hours.

      This duration identifies the amount of time that transpires from the beginning to the end of the 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 applies when the configured conditions happen five times every three hours.

    These two 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 alarm Alarms provide notification of an event or sequence of events that require attention or investigation. for an unauthorized access An 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, execute commands in a remote machine, and move files from one machine to another through Secure Copy (SCP). login Log 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.

  10. Click Save.
  11. The suppression rule has been created. You can see it from Settings > Rules. See Suppression Rules from the Orchestration Rules Page for more information.

    Important: It takes a few minutes for an orchestration rule to become active.