Threat Stack is a behavior based anomaly detection platform, based on telemetry delivered into the platform from various sources, including host and infrastructure.
What is an Alert?
Alerts are behavior anomalies elevated from the stream of raw telemetry by rule filters.
Alerts contain two main components, the Alert Title and the Contributing Events.
|Alert Title||The name and substitutions (dynamic content) that adds context to the alert.|
|Contributing Events||The raw telemetry that caused the anomaly to happen.|
The substitution fields should match the aggregation fields selected for the alert. The aggregation fields define the uniqueness of the alerts. See the Life Cycle of an Alert article for additional information on aggregations.
Why would an Alert Trigger?
Alerts trigger when Threat Stack detects a behavior anomaly deemed inappropriate based on rules that you enabled or created.
Rules require a filter to match behaviors against raw telemetry.
|Telemetry||Events and behavior anomalies.|
|Rules||Behaviors that you want to catch from the raw telemetry stream.|
Rule Filter Example
|Behavior to Catch||Rule Filter|
|Privilege escalations||command =“sudo”|
|User access||Event_type =“login"|
If a rule displays alerts for behavior you consider “baseline” or “normal”, you can create a suppression filter to have it no longer report that behavior. The content should match the aggregation fields selected for the alert. The aggregation fields define the uniqueness of the alerts. See the How do I suppress Alerts? article.
Threat Stack includes three levels of elevation of behaviors to indicate the severity of the alert:
- Severity 1 (Sev 1)
- The highest elevation of behaviors.
- Use for behaviors and scenarios that should wake you up in the middle of the night. Only use for behavior anomalies where an action and remediation runbook exists.
- Severity 2 (Sev 2)
- The second highest elevation of behaviors.
- Behaviors that you want to monitor and review with stakeholders to improve over time.
- Severity 3 (Sev 3)
- The third highest for behaviors users, Sev 3 alerts are automatically dismissed after 30 days.
- Behaviors that companies log for compliance or forensics purposes.
Where do I find Alerts in the Threat Stack Application?
You find alerts and their information on the Alerts page. There you can find:
- Alerts sorted by severity, type, or active and dismissed
- Alerts Trends over time histogram
On the Alerts page you have the option to:
- Select an alert to review the alert details.
- Suppress an alert.
- Dismiss an alert (if you dismiss an alert it displays in the Dismissed tab).
Alerts, along with contributing events, display in the Threat Stack application and API for 1 year.
See the Life Cycle of an Alert article for a full alert use case.