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After hours, under attack: how AI detects threats while you sleep

Ade Taylor
October 13, 2025 4 min read

It may come as a surprise, but most cyberattacks don't happen at 10am on a Tuesday.

More often, they happen when your teams are offline: when your SOC is running on minimal staffing, when an alert gets buried under hundreds of others. It’s intentional, of course. Attackers deliberately operate during evenings and weekends precisely because they know the human-led response slows down after hours.

But AI doesn’t sleep. And that’s where the modern Security Operations Centre gains its edge.

The real-world threat of after-hours attacks

Let’s say a threat actor compromises an employee’s credentials through a targeted phishing campaign. They wait until a Sunday evening to test access, logging in from a foreign IP, moving laterally across shared systems until they hit the jackpot – your critical data. Then, they slowly start exfiltrating data in small increments to avoid detection.

In a traditional SOC, this may trigger an alert – but with no one watching closely and no immediate triage, it slips through.

In an AI-enabled SOC, that same activity looks very different.

  • The timing of access is flagged as unusual.
  • The location is outside normal parameters.
  • The data movement is inconsistent with the user’s behaviour profile.

Within seconds, AI correlates these signals, scores the risk, and notifies analysts not just with an alert, but with an incident story.

This isn’t just faster detection, it’s smarter prevention and the key difference is context.

Traditional security systems rely on static rules: block this IP, flag that file. But attackers know how to work around rules. AI looks at behaviour, not just signatures.

It understands that a finance contractor doesn’t normally log in on a Sunday night from Romania. Or download 1.2GB of encrypted ZIP files. It picks up on low-and-slow indicators of compromise and pieces them together. As I said: Context.

What this means for security leaders

After-hours coverage has always been a challenge. Hiring overnight SOC analysts is expensive and hard to scale. An AI-powered SOC closes that gap, not by replacing humans, but by amplifying what your team can do, when they can’t be there in person.

It reduces noise, spots the meaningful signals, and takes intelligent first-response actions so your team can take over from a position of control.

In short, AI gives you visibility when attackers hope you’re blind.  It means your defences don’t clock off at 5.30pm – and your response time doesn’t depend on who’s on call.

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Find out more about Roc's Managed Security Operations Centre here

Written by Ade Taylor

Head of Security Services