IOC Triage: A Repeatable Workflow for Busy SOC Analysts

Triage is not investigation. Triage is the fast, disciplined act of deciding which IOCs deserve investigation at all. Get triage right and the deep work goes to the alerts that matter; get it wrong and you either burn hours on noise or miss the one that counts.

One verdict, four questions

Good triage compresses everything into a single verdict — HIGH, MEDIUM, LOW, or UNKNOWN — backed by answers to four questions you can ask of almost any IOC:

• Reputation — has anyone reported this as malicious, and how confidently?
• Prevalence — is it widely seen (commodity) or rare (possibly targeted)?
• Context — does what we know about it match the alert that surfaced it?
• Freshness — is the intel recent enough to trust for a decision now?

Normalise the IOC first

IOCs arrive defanged in tickets and reports: 1[.]2[.]3[.]4, hxxps://bad[.]example, evil(dot)com. Before you can look anything up you have to refang it back to a usable form. This is mechanical, error-prone, and constant — automate it so an analyst never fat-fingers an octet at 2am.

Let the worst signal win

Resist the urge to average. A verdict built on "three sources say clean, one says malicious → probably fine" is how real detections get closed. Clean means "not observed," which is not the same as safe. Let the single most damning, high-confidence signal set the verdict, and make the verdict explainable: an analyst should be able to click it and see exactly which source triggered it.

Explainability is what separates a triage tool from a black box. "HIGH because AbuseIPDB reports 94% confidence across 40 reports" is actionable. A bare risk number is not.

Escalate deliberately, not reflexively

When triage returns HIGH or an ambiguous MEDIUM, that is the signal to move into Deep Investigation — pull the full per-source breakdown, then open Tier 2 sources one deliberate click at a time for the specific gap you need to close. LOW and UNKNOWN with no corroboration usually get documented and closed.

Where the time actually goes

Measure your own triage and you will find most of the minutes are spent on mechanics, not judgment: refanging, logging in, switching tabs, reconciling formats. That is exactly the part Deep Detect removes — right-click an IOC, get a single explainable verdict across all five Tier 1 sources, and spend your attention on the decision instead of the plumbing.