What should organisations do first when BEC risk is concentrated on a small set of users?

Focus on the people attackers keep returning to

When BEC is concentrated on a small set of users, the first task is to identify that concentration clearly rather than spreading controls evenly across the organisation. Attackers usually follow the path of least resistance, so the highest-value users, frequent payment approvers, payroll contacts, assistants, and anyone who can change bank details or approve exceptions deserve immediate attention.

This is less about building a universal programme than about isolating the small number of accounts where a compromise would be most likely to turn into fraud. A short, accurate target list also makes later controls easier to test and keep current.

Apply controls where a single mistake has the biggest impact

Once the high-risk users are known, the next move is to put layered controls around the specific actions BEC campaigns try to manipulate. That usually means tighter verification for payment changes, separate approval paths for financial requests, step-up checks for mailbox or payroll changes, and more frequent review of access that can authorise money movement or identity updates.

Those controls work best when they are narrow and concrete. If the process is too broad, staff will route around it; if it is too weak, the attacker still wins with one successful social-engineering step.

For concentrated BEC exposure, the control objective is to make the attacker’s preferred workflow slow, visible, and hard to complete without a second independent check. That matters more than adding generic awareness alone, because the attack usually succeeds at the decision point, not at the perimeter.

Build a repeatable response around the hotspot users

Because concentration makes a small number of accounts disproportionately important, organisations should treat them as a standing monitoring priority. That means tracking unusual login patterns, sudden changes to payment instructions, inbox rule tampering, forwarding changes, and requests that bypass normal business rhythm, then using that signal to refine the protected user list over time.

In practice, the useful question is not only “who is targeted most often?” but also “which workflow changes would be catastrophic if they were approved once?” That is the place to place process friction, logging, and manual confirmation.

Risk and Threat Considerations

Concentrated BEC risk creates a classic high-leverage failure mode: if attackers persuade one of a few heavily targeted users, the organisation can suffer disproportionate fraud or account abuse. The danger is not just the number of targets, but the fact that those users often sit closest to payments, payroll, or executive trust.

Failure mechanism: Attackers exploit predictable approval paths, urgent requests, and weak verification around high-trust users to redirect funds or alter sensitive account details before the deception is detected.

Impact: A single successful compromise can produce immediate financial loss, internal trust breakdown, and wider mailbox or payment-process exposure if the attacker uses that foothold to stage further fraud.

Practitioner Guidance

What to prioritise: Start with the top few users whose compromise would create the largest financial or operational loss, then map the exact actions they can initiate or approve.

What to verify: Check that payment changes, payroll requests, and executive exceptions require an independent confirmation path that is hard to bypass and is actually used in practice, not just documented.

Common mistake: Treating BEC as a general awareness problem. The better starting point is to harden the small number of workflows that attackers repeatedly target and to make those workflows observable.

Practitioner takeaway: When BEC is concentrated, precision beats breadth, protect the few users and approval paths that carry the most fraud leverage first, then expand only after those controls are working.

Related resources from NHI Mgmt Group

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• How should small and midsize organisations reduce the risk of credential compromise without adding too much friction for users and admins?
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