Security Alert Triage for SOC 2

What this control should accomplish

Each actionable security alert receives a timely, consistent decision: investigate, escalate, suppress with justification, or close with an attributable rationale.

How to implement Security Alert Triage

1. 1

   Define triage decisions

   Document severity factors, minimum investigation fields, escalation triggers, closure reasons, and which decisions require a second reviewer.

   You should end up with: Alert triage and severity guide

2. 2

   Create one accountable queue

   Route covered alerts to a queue with an owner, backup coverage, aging visibility, and a method to distinguish new, active, escalated, and closed work.

   You should end up with: Owned alert queue with status workflow

3. 3

   Give responders useful context

   Attach the affected identity, asset, customer context, detection reason, related activity, and source links needed to make a defensible decision.

   You should end up with: Enriched alert record

4. 4

   Record investigation and escalation

   Capture checks performed, evidence considered, severity, responder, timestamps, escalation, and any incident or remediation record created.

   You should end up with: Attributable triage record for each reviewed alert

5. 5

   Review quality and backlog

   Sample closed alerts, inspect overdue work, analyze recurring false positives, and assign rule or process improvements.

   You should end up with: Triage quality review and tracked improvements

Evidence to keep, and what it should prove

Build the evidence set in three layers: what defines the control, who approved or reviewed it, and what proves it operated. Collect operating records when the work happens so they remain dated, attributable, correctly scoped, and traceable to the underlying activity.

Before sharing, remove unrelated personal or customer data, never expose passwords, tokens, or secret values, preserve enough source context to authenticate the record, and use the secure exchange approved for the engagement.

Which records should you prepare for the audit?

How an auditor may test this control

Use this checklist to prepare for procedures an auditor may perform. The exact steps and sample selection depend on your engagement scope and the service auditor's professional judgment.

• Confirm the intended control outcome

  Determine whether the control is designed to achieve this result: Each actionable security alert receives a timely, consistent decision: investigate, escalate, suppress with justification, or close with an attributable rationale.

• Confirm ownership and operating cadence

  Compare the documented owner with the intended role (Security Operations / Engineering / Infrastructure), then compare dated records with the stated cadence: Continuous/ongoing; periodic review by risk.

• Establish the complete audit record set

  Compare full-period alert exports and source counts from every covered detection platform with the triage-queue population using stable alert IDs; account for duplicates, suppressions, transfers, and ingestion failures, and investigate any alert lacking a final disposition.

• Prepare the as-of-date evidence for a Type 1 engagement

  The current triage and severity guide, owned queue configuration, escalation routes, and recent completed alert records showing the process is designed and operating at the review date.

• Prepare period evidence for a Type 2 engagement

  Every security alert accepted into the covered alert sources or triage queues during the review period, including alerts deduplicated, suppressed, escalated, transferred, or closed; preserve the original identifier and final disposition for each occurrence.

• Inspect the approval / review evidence

  Records showing that an accountable person reviewed, approved, challenged, or accepted the work.

  • Inspect escalation decisions

    For each selected record, confirm it demonstrates Responders applied defined escalation triggers and recorded whether the alert became an incident, specialist review, or other owned follow-up.

    • Alert ID
    • Escalation decision
    • Decision time
    • Decision-maker
    • Recipient
    • Linked case or incident

  • Inspect closure rationale

    For each selected record, confirm it demonstrates Closed alerts have an attributable, evidence-based explanation and any suppression, tuning, or remediation work is traceable.

    • Alert ID
    • Closure category
    • Rationale
    • Closer
    • Closed time
    • Follow-up link

• Inspect the operating / technical evidence

  Dated proof that the control actually ran, such as tickets, logs, settings, exports, reports, and test results.

  • Inspect Alert/ticket records

    For each selected record, confirm it demonstrates Each covered alert entered an owned workflow and retained its source, timestamps, assignee, status, and final disposition.

    • Alert or ticket ID
    • Source detection
    • Created time
    • Assignee
    • Status
    • Disposition

  • Inspect triage notes

    For each selected record, confirm it demonstrates A responder evaluated the alert using relevant identity, asset, activity, and customer context rather than closing it from the title alone.

    • Responder
    • Investigation time
    • Checks performed
    • Evidence links
    • Conclusion
    • Next action

  • Inspect severity assignments

    For each selected record, confirm it demonstrates Alerts received a documented priority based on defined factors and were reclassified transparently when facts changed.

    • Initial severity
    • Severity factors
    • Decision-maker
    • Decision time
    • Changed severity
    • Change rationale

• Trace the control from design to operation

  Use the categories that apply to this control: connect any policy or design artifact to its approval or review record, then trace a selected operating record through execution, result, and any exception or remediation.

Common implementation and evidence gaps

• Alerts are marked resolved without investigation notes or a closure reason.
• Severity reflects a tool score but ignores asset, customer, or privilege context.
• No one covers the queue outside normal working hours even though urgent alerts continue.
• Suppression rules hide noisy detections indefinitely and have no owner or expiry.
• An escalated incident cannot be traced back to its originating alert and timeline.

Before you call this control ready

• Can a reviewer understand why a recent high-severity alert was closed or escalated?
• Are open alerts visible by age, severity, and assigned responder?
• Would an urgent alert reach a qualified person during nights or holidays?
• Are suppressions time-bound and reviewed before renewal?
• Do sampled closed alerts follow the documented severity and evidence expectations?

Trust Services Criteria references

These identifiers help you navigate related Trust Services Criteria. They do not reproduce the criteria or prove that this control fully addresses them in your environment.

• CC7.2
• CC7.3

Confirm final scope, mappings, and testing expectations with your service auditor. SOC 2® is an AICPA trademark; GreenHat Security is not affiliated with or endorsed by AICPA.

Related controls to review next