Spotting and Stopping CEO Fraud and Urgent Payment Scams.
The email arrived on a Thursday afternoon from the managing director. He was travelling, the email explained, and needed an urgent wire transfer completed before close of business. A large deal was closing and the funds needed to clear before the weekend. The usual approval process would cause delays that would put the deal at risk. Please process immediately.
The accounts manager processed it. The managing director had no idea until Monday morning. The transfer was €34,000. It was gone.
This is CEO fraud — also known as business email compromise from an executive perspective, or "whaling." It is one of the most consistently successful fraud techniques targeting Irish businesses because it weaponises the instinct to comply with senior management instructions and the reluctance to challenge them.
How CEO Fraud Works
CEO fraud involves an attacker impersonating a senior executive — the managing director, the CEO, a company director — to instruct a finance team member to make an urgent payment, often without following normal approval procedures.
The attack has two variants. In the first, the executive's email account is not actually compromised — the attacker sends from a lookalike domain (yourbusiness-ie.com instead of yourbusiness.ie) or uses a display name spoofing technique that shows the executive's name even though the email comes from a different address. In the second, the executive's email account has genuinely been compromised, and the instruction comes from their actual address.
Both variants share the same psychological mechanism: urgency that demands immediate action, authority that discourages challenge, and isolation that prevents normal verification — "I'm in meetings, just process it and I'll explain later."
Why It Works on Smart People
CEO fraud works on intelligent, responsible finance professionals because it is designed specifically to exploit the behaviours that make them good at their jobs. Responsiveness to senior management. Discretion when executives indicate a matter is confidential. Willingness to accommodate urgency when circumstances seem to warrant it.
An attacker who has researched your business — who knows the managing director's name and travel schedule from LinkedIn, who knows the accounts manager's name from the company website, who knows the approximate scale of deals your business does — can craft an email that reads exactly as the genuine article would. The only thing missing is the phone call to verify.
The phone call to verify is the entire protection. An absolute rule that any payment instruction outside normal procedures must be verbally confirmed with the sending executive — on a number already held on record, not a number provided in the email — stops CEO fraud completely.
Does your finance team have an explicit, standing instruction that urgent payment requests from senior executives are always verbally confirmed before processing? If not, the rule costs nothing to introduce and closes the gap entirely. Book a free 20-minute strategy call — payment fraud prevention is a core component of our Irish SME security advisory work.
The Warning Signs
Train your finance team to treat the following as automatic red flags requiring verbal verification:
Urgency that bypasses normal process. Legitimate urgent transactions can still be verified. An instruction that specifically asks you to skip the normal approval process is more suspicious, not less.
Confidentiality that isolates the request. "Don't mention this to anyone else" or "this is sensitive, just between us" is a social engineering technique, not a legitimate business instruction.
New or changed bank details. Any payment to an account not previously used, or any instruction to update a payee's bank details, should automatically trigger call-back verification regardless of who appears to have sent it.
Communication channel inconsistency. An executive who normally uses Teams or calls you when they need something urgent, suddenly sending an email only, is a pattern worth noticing.
The Technical Controls
Beyond the call-back rule, several technical controls reduce CEO fraud risk.
DMARC at enforcement level prevents attackers from spoofing your exact domain — from sending an email that appears to come from @yourbusiness.ie when they do not control that domain. This does not prevent all impersonation, but it removes the most convincing variant.
Email display name verification training. Most email clients show the sender's display name prominently and the actual email address less visibly. Train staff to check the full email address, not just the displayed name, for any financial instruction.
Conditional Access with sign-in alerts. If the executive's Microsoft 365 account is compromised and genuinely sending fraudulent payment instructions, Microsoft sign-in anomaly alerts will surface a login from an unusual location or device. Ensuring these alerts are monitored and acted upon catches account compromise before it is used for fraud.
Why This Matters Right Now
An Garda Síochána's National Cyber Crime Bureau has consistently identified CEO fraud as one of the highest-loss cybercrime categories affecting Irish businesses, with average losses per successful incident significantly higher than most other fraud types [^1]. The NCSC Ireland includes executive impersonation guidance in its financial services and professional services sector advisories.
CEO fraud succeeds once, then it does not succeed again — because the business that has been defrauded implements the call-back rule immediately. The businesses that implement the rule before they need it save themselves the €34,000.
What Next
Introduce the call-back rule immediately. Communicate to your finance team this week: any payment instruction from a senior executive that is outside normal procedures must be verified by phone on a known number before processing. No exceptions.
Check your DMARC configuration. Use mxtoolbox.com to verify your domain's DMARC policy. If it is set to p=none or absent, update it to p=reject to prevent domain spoofing.
Run a CEO fraud simulation. With management approval, send a simulated CEO fraud email to your finance team and observe the response. The result is more instructive than any briefing — and it identifies the specific training gap.
Ready to find out exactly where your business stands? Book a free 20-minute strategy call with our vCISO team at www.pragmaticsecurity.ie/book-a-call. No sales pitch. No jargon. Just clarity on your cyber risk — and a clear plan to address it.
Related Reading
- Fraud Prevention in Finance: Dual Approval, Call-Backs and Process Controls
- Email Fraud and Invoice Redirection Scams: How They Work and How to Stop Them
- AI Voice Cloning Fraud: The Deepfake CEO Scam Hitting Irish SMEs
[^1]: An Garda Síochána — National Cyber Crime Bureau [^2]: NCSC Ireland — Business Email Compromise Guidance [^3]: Data Protection Commission Ireland
Pragmatic Security — Cybersecurity advisory for Irish businesses. Based in Donegal, Ireland. CISA, CISSP, CISM certified advisors.
