Not every cyberattack starts with a virus, a hacked server or a dramatic system breach. Some of the most expensive attacks start with a simple email that looks normal enough to trust. A supplier emails to say its bank details have changed. The message looks familiar, the invoice amount is correct and there is nothing obviously suspicious about it. So, the payment is sent to the new account. Only later does the business discover that the supplier never sent the email.
Instead of relying on malware or forcing their way into a system, attackers often exploit trust by impersonating a director, supplier or customer. Understanding how these attacks work is the first step towards preventing them.
What Is a Business Email Compromise?
Business Email Compromise is a form of fraud in which attackers impersonate trusted people or organisations, usually to steal money or sensitive information. They may impersonate a director, supplier, customer or employee.
BEC attacks can also happen in different ways:
- Email spoofing: The attacker forges the sender information so the message appears to come from a legitimate person or business.
- Compromised email account: The attacker gains access to a legitimate mailbox and uses the real account to send or monitor messages.
- Lookalike domain: The attacker registers or uses a domain that closely resembles the legitimate one, making the difference easy to overlook.
This is why email security should not be viewed only as a matter of blocking viruses and spam. Businesses also need controls that help identify suspicious communication, protect user identities and make fraudulent requests harder to act on.
For SMEs, services such as Netcare System Services can also provide additional support with email security, monitoring and identifying suspicious activity.
How Email Spoofing and Invoice Fraud Actually Work
A BEC or invoice fraud attack is often carefully planned. Attackers can spend time learning about a company before making their move.
Public information on company websites, social media profiles, job listings and professional networks can reveal names, roles, suppliers and reporting relationships. Once the attacker understands the business, the fraud can unfold in several stages.
1. The target comes first
Finance employees are obvious targets, but attackers may also target business owners, operations teams or employees who communicate with suppliers. The goal is to reach someone who can make or influence a payment.
2. Then comes the research
The attacker may research payment schedules, approval processes, email signatures and supplier relationships to make the eventual request feel ordinary.
3. They impersonate or compromise an account
The attacker may spoof an address, use a lookalike domain or compromise a genuine mailbox. A compromised account is particularly useful because it provides access to previous conversations and ongoing transactions.
4. They create a believable request.
This is where invoice fraud becomes dangerous. The attacker does not usually ask for something completely absurd. The request may involve an updated bank account, an urgent invoice, a payment that needs to be completed before a deadline or a request for sensitive employee or customer information.
5. Pressure is created
Urgency is a common part of BEC. The message may suggest that a senior executive is waiting, a supplier will stop work or a payment must be completed immediately. Some attackers also ask recipients to keep the matter confidential.
6. The employee acts
If the request appears legitimate, the employee may transfer money, update supplier information, send confidential data or approve a transaction. From the employee’s point of view, they may simply have completed a normal business task.
That is what makes BEC particularly difficult to detect. The final action is often performed by the employee, but they have been manipulated into doing it.
7. The attacker disappears or continues the conversation.
Some attackers stop after payment; others continue the conversation to delay discovery or attempt further transactions.
Common Signs of a BEC or Invoice Fraud Attack
BEC attacks are designed to look normal, but unusual details can provide important warning signs. Employees should slow down and verify a request when they notice:
- Unexpected bank detail changes : If a supplier suddenly wants payments sent to another account, verify the change independently.
- Urgent or unusual payment requests : Requests involving unexpected deadlines, large amounts or unusual payment methods deserve a second look.
- Slightly altered email addresses or domains: A single changed character, extra word or different domain extension can indicate a lookalike address.
- Requests to Skip an approval step: If someone asks you to skip verification, avoid calling the supplier through a trusted channel or keep the request confidential, stop and verify it.
- Changes in writing style or tone: If someone who normally writes in a particular way suddenly sends an unusual message, it is worth checking, particularly when the request involves money.
- New payment instructions that do not match previous records : Differences between a new invoice and established supplier details should be independently verified.
- Requests for sensitive information : Emails asking for salary information, customer records, financial details or employee data should be carefully checked before anything is shared.
How Businesses Can Reduce BEC and Invoice Fraud Risk
There is no single tool that will eliminate BEC. The stronger approach is to combine technical controls with everyday business checks.
Start with multi-factor authentication
Email accounts should not rely on passwords alone. Multi-factor authentication should be enabled for email and other important accounts. If a password is stolen, MFA can make unauthorized access more difficult.
Protect the company email domain
SPF, DKIM and DMARC help organisations authenticate email and reduce the risk of attackers successfully spoofing their domain.
Make bank-detail changes harder to fake
A supplier’s request to change its payment account should be confirmed through a trusted channel. Call a known contact using information already held by the business rather than relying on the details in the new email.
Use dual approval for sensitive payments.
High-value transfers, new beneficiaries and significant changes to payment instructions should ideally require more than one person to approve them. Dual approval can prevent one fraudulent request from immediately becoming a financial loss.
Train employees using realistic examples
Security awareness training should go beyond telling employees to “watch out for phishing”. Staff should understand how invoice fraud, spoofed emails, compromised accounts and social engineering actually appear in everyday business communication.
Monitor suspicious account activity
Unexpected sign-ins, unfamiliar devices and strange mailbox forwarding rules can indicate that an account has been compromised. This is an area where support from a provider such as Netcare System Services can help businesses monitor their environment and respond to suspicious activity.
For SMEs, effective security does not necessarily mean creating complicated processes. The goal is to place simple checks at important points so that one rushed or convincing email cannot override normal verification procedures.
What to Do If You Suspect a BEC Attack
If a suspicious payment request has been identified or an employee believes an account may have been compromised, acting quickly can limit the damage.
A practical response can follow six steps:
- Stop : Pause the payment, bank-detail change or information-sharing request if it has not yet been completed.
- Verify : Contact the genuine supplier, customer or employee through a trusted channel. Do not simply reply to the suspicious email.
- Secure : Change the relevant credentials, revoke suspicious sessions and review the mailbox for unauthorised activity.
- Report : Notify the bank, IT provider and relevant people within the business. If money has moved, contact the bank immediately.
- Investigate: Review sign-in history, mailbox forwarding rules, deleted messages and related conversations. This can help establish whether the attacker accessed anything else.
- Monitor : Continue watching for follow-up emails, suspicious logins or additional fraudulent requests, as attackers may try again.
How Netcare System Services Can Help
BEC works because it exploits normal business behaviour. People trust their suppliers, employees respond to managers and finance teams process invoices. An attacker simply tries to make a fraudulent request look ordinary.
Netcare System Services helps SMEs strengthen email security, identity protection, user awareness and practical IT processes. Businesses can also review their Microsoft 365 environment, email configuration and payment controls to identify weaknesses and put appropriate safeguards in place.
BEC does not always involve sophisticated malware or a major technical breach. Sometimes, an attacker only needs a convincing identity and a believable request.
The strongest defence combines email and identity controls with employee awareness, independent payment verification and clear reporting procedures. When money, sensitive information or an unexpected change is involved, taking a few minutes to verify the request can prevent a much larger loss.