In this example you will create an orchestration rule to generate an alarm Alarms provide notification of an event or sequence of events that require attention or investigation. when an access to a specific path is detected in a web server.
To create an orchestration rule for generating an alarm when an access to a specific path is detected in a web server
- Go to Settings > Rules > Orchestration Rules.
- Select Create Orchestration Rule > Alarm Rules.
Select a packet type in the Match drop-down list.
The first match criteria for all rules must be the packet_type detail field:
Logs: Use this packet type for event-based rules.
Warnings: Use this packet type for configuration issues-based rules1.
Vulnerabilities: Use this packet type for vulnerabilities-based rules.
Select these property values:
- Click Next.
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.
- Enter a name for the rule (for example, Secret Path Accessed).
- (Optional.) Enter a description for identifying this rule.
- Select an intent.
- Enter a method.
- Select a strategy.
- Enter a priority.
- Configure a mute value.
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 end of the occurrence. If the number of occurrences is not met within this period, the rule is not a match.
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.
(Optional.) Select the fields that you want to display in the generated alarm.
You can select or remove the fields you want to include in the details of the alarm. A field passes from one column to the other by clicking it.
The created rule displays in the list of rules. You can see it from Settings > Rules > Orchestration Rules. See Orchestration Rules for more information.
The intent describes the context of the behavior that is being observed. These intents roughly map to the stages of the intrusion kill chains, but are collapsed to ensure that each is discrete. See Intent for more information about the available threat categories.
If known, it is the method of attack or infiltration Indicator that specifies the method of attack that generated an alarm. For Open Threat Exchange® (OTX™) pulses, this method is the pulse name. associated with the indicator that generated the alarm.
Note: This is a required field; if you do not complete this field, the Save button remains inactive.
The strategy describes the broad-based strategy or behavior that is detected. The intention is to describe the strategy the malicious Activity in a system that exceeds or misuses that access in a manner that negatively affects the confidentiality, integrity, or availability of the organization's information systems. user is using to achieve their goal.
See Priority Field for Alarms for more information.
Once an alarm is created, you can set the time that USM Anywhere will not create a new alarm based on the same conditions. This configured time is the mute value and you can specify it in seconds, minutes, and hours.
Important: It takes a few minutes for an orchestration rule to become active.