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Financial Services

From 40,000 alerts to 40 real cases

A security operations team of nine reviewing roughly 40,000 alerts a month, with mean time to contain measured in hours and a growing backlog nobody could clear.

14 weeks to autonomous containment · North America
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Before and after

BeforeAfter
Alerts to human review40000 → 3200
Mean time to contain (min)380 → 3
Analyst investigation depth22% → 91%
Backlog age (days)34 → 1

92%

Alert noise cleared pre-review

41 sec

Credential compromise dwell time

3

Material incidents caught pre-exfiltration

100%

Autonomous actions with audit records

The challenge

What they were dealing with

The tooling was good and the coverage was reasonable. The problem was arithmetic: nine analysts could not investigate 40,000 alerts, so triage became pattern-matching on alert titles. Two genuine incidents in the preceding year had been closed as noise and only found later during a routine hunt.

National insurance carrierNorth America14 weeks to autonomous containment

Services involved

What we did

  1. 01

    Spent three weeks tuning detections before automating anything — the queue was 91% false positive and automating that would have industrialised the wrong answer

  2. 02

    Correlated identity, endpoint, cloud and SaaS telemetry into a single timeline per entity

  3. 03

    Built triage agents that gather the same context an analyst would and write up a case with an explicit dismissal rationale

  4. 04

    Limited autonomous containment to reversible actions — session revocation, token invalidation, host isolation. Destructive actions still require a named human

  5. 05

    Validated with a purple-team exercise before granting any autonomous authority

The outcome

2.8 min mean time to contain

Measured against the pre-engagement baseline and re-verified at the 90-day review.

  • 92% — Alert noise cleared pre-review
  • 41 sec — Credential compromise dwell time
  • 3 — Material incidents caught pre-exfiltration
  • 100% — Autonomous actions with audit records
We did not add analysts. We stopped asking the ones we had to prove that 36,000 things were fine.
Director of Security OperationsNational insurance carrier

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