BIPI
BIPI

SOAR Playbooks That Save Time vs the Ones That Eat It

Cybersecurity

SOAR sells on the promise of automation, but most playbooks deployed in production add latency and complexity without reducing analyst load. The difference between a playbook that earns its keep and one that does not is mostly about scope discipline.

By Arjun Raghavan, Security & Systems Lead, BIPI · September 17, 2023 · 9 min read

#soar#automation#soc#cortex-xsoar#splunk-soar#sentinel

Every SOAR vendor demo shows the same slide. Analyst time per incident drops from 45 minutes to four. In practice, six months into a SOAR rollout, the average team has 80 playbooks, 30 of which are broken, 20 of which fire but do nothing useful, and 5 of which actually shorten investigation time. The other 25 are theoretical.

What a Good Playbook Does

A playbook that saves time does one of three things. It enriches an alert with context the analyst would have manually gathered. It executes a deterministic containment action that does not require judgment. It collects evidence in parallel that the analyst would have collected sequentially. Anything else is a script masquerading as automation.

  • Enrichment: pull WHOIS, VirusTotal, AbuseIPDB, internal asset CMDB, and recent activity for an indicator in parallel
  • Containment: isolate an endpoint via EDR API, reset a session token, disable a user account in Entra ID
  • Evidence collection: trigger a Velociraptor hunt, capture process memory, pull recent EDR events for the affected host
  • Notification: page the right on call based on asset criticality, post a structured Slack message to the IR channel

What a Bad Playbook Does

Bad playbooks try to replace analyst judgment. They make containment decisions on weak signals, escalate every alert to a human anyway, or attempt to write the investigation conclusion before the investigation has happened. They also tend to be deep, branching, and brittle, with 40 nodes and three conditional paths that nobody tests after deployment.

Scope Discipline

A playbook should fit on a single screen. If it requires scrolling, it is doing too much. Decompose by triggering condition, not by lifecycle. A phishing playbook should be one enrichment playbook plus one user notification playbook plus one URL blocklist playbook, each independently testable, not a 60 node monolith that handles every phishing case from delivery to user training.

Idempotency Is Mandatory

  1. Every action must be safe to retry: isolating an endpoint that is already isolated should succeed, not fail
  2. Every enrichment call must have a timeout: external APIs fail, and a playbook that hangs blocks the queue
  3. Every state transition must be observable: log every action with input, output, and duration
  4. Every playbook must have a rollback path: an analyst should be able to undo a containment action with one click

Common Time Sinks

The biggest hidden cost in SOAR is the maintenance load. APIs change, credentials rotate, vendor responses get rate limited, and the playbook that worked last month silently fails this month. Monitor every playbook for execution time, error rate, and stalled runs. A playbook that errors 30 percent of the time is worse than no automation, because analysts learn to ignore its output.

Where to Start

  • Identify the top 5 alert types by volume from your tuning analysis
  • For each, write down the first 10 minutes of an analyst's investigation as a checklist
  • Automate the deterministic steps in that checklist, never the decision steps
  • Measure analyst time per alert before and after, expect 30 to 50 percent reduction on enrichment heavy alerts
Automation should remove tedium from analysts, not judgment from analysts. The moment a playbook starts making decisions, the SOC starts auditing the playbook instead of the threat.

Picking the Right Tool

Cortex XSOAR, Splunk SOAR, Microsoft Sentinel Logic Apps, Tines, and Torq cover similar ground with different price points and integration depth. The tool matters less than the discipline. A team with rigorous scope and idempotency standards will outperform a team with the most expensive license and no standards. Pick the tool that integrates cleanly with your SIEM and EDR, not the one with the longest connector catalog.

Read more field notes, explore our services, or get in touch at info@bipi.in. Privacy Policy · Terms.