Phishing & Human Error: Why Your People Are the First Line of Defence
Cyber Awareness Month
Cybercriminals don't always need to break through sophisticated security systems. Sometimes, it is much easier to persuade a busy employee to click a link, open an attachment or approve a request.
That is why phishing remains one of the most common and effective cyber threats facing businesses. It targets human behaviour by creating urgency, building trust and encouraging someone to act before they have had time to stop and assess the situation.
For the first topic of Cyber Awareness Month, we are looking at how phishing works, why human error matters and the practical steps organisations can take to reduce their risk.
What Is Phishing?
Phishing is a form of cyber attack in which a criminal impersonates a trusted person, supplier or service. The aim is to persuade the recipient to reveal information or take an action that gives the attacker access to money, accounts, devices or business data.
A phishing message may encourage someone to:
Click a malicious link.
Open an infected attachment.
Enter their Microsoft 365 username and password into a fake sign-in page.
Approve an unexpected multi-factor authentication request.
Transfer money or accept a change to supplier bank details.
Share sensitive company, customer or employee information.
The message may appear to come from Microsoft, HMRC, Royal Mail, DocuSign, a supplier or even a senior colleague. The branding can look convincing, and the wording may closely resemble a genuine request.
Why Does Human Error Matter?
Phishing works because attackers understand how people behave at work. Employees often process large volumes of emails, switch between tasks, and respond quickly to customers, managers, and suppliers. A convincing message arriving at the wrong moment can easily catch someone off guard.
Attackers commonly exploit:
Urgency: “Your password expires today” or “Payment is required immediately”.
Authority: A request that appears to come from a director, manager or important customer.
Familiarity: Recognisable branding from Microsoft, a bank, courier or regular supplier.
Fear: A warning that an account will be suspended or data will be lost.
Curiosity: An unexpected document, voicemail, invoice or shared-file notification.
This does not mean employees are careless. It means criminals deliberately design messages to create pressure and bypass normal decision-making. A strong cyber security culture should therefore focus on confidence, awareness and easy reporting rather than blame.
The Warning Signs Everyone Should Recognise
Phishing emails are becoming more convincing, but there are still common warning signs worth checking:
The message creates unusual pressure to act immediately.
The display name looks familiar, but the full sender address is unexpected.
A link leads somewhere different from the organisation named in the message.
There is an unexpected attachment, QR code or document-sharing request.
The sender asks for a password, verification code or MFA approval.
Bank details or payment instructions have suddenly changed.
The tone or wording does not sound like the person it claims to be from.
The request bypasses your normal approval or verification process.
No single warning sign proves that a message is malicious. However, an unusual request combined with urgency, a suspicious sender address or an unexpected link should always be treated cautiously.
What Could One Click Mean for a Business?
A successful phishing attack can lead to much more than an unwanted email. If an attacker obtains valid login details or gains access to a device, the impact may include:
Compromised Microsoft 365 or cloud accounts.
Fraudulent payments and diverted invoices.
Malware or ransomware infections.
Loss or exposure of sensitive data.
Business interruption and recovery costs.
Reputational damage with customers and suppliers.
Regulatory, contractual or cyber insurance complications.
The earlier suspicious activity is identified and reported, the greater the opportunity to limit the damage. Employees should know exactly who to contact and feel comfortable reporting a concern, even if they have already clicked.
Five Practical Actions to Take Today
1. Stop and assess before clicking
Take a few seconds to check unexpected messages, particularly those involving passwords, payments, attachments or urgent requests.
2. Verify sensitive requests independently
If someone asks for payment, confidential information or a change to bank details, contact them using a known phone number or a separate trusted communication channel. Do not rely on the contact details contained in the suspicious message.
3. Use multi-factor authentication
MFA adds an important extra layer of protection. Employees should never approve a sign-in request they did not initiate and should report unexpected prompts immediately.
4. Keep devices and applications up to date
Supported and regularly updated devices, browsers, and applications reduce the chance of an attacker exploiting a known weakness after a phishing attempt.
5. Make reporting simple and blame-free
Employees are more likely to report suspicious activity quickly when the process is clear, and the culture is supportive. Fast reporting can turn a potential incident into a manageable security event.
Building a Human Firewall
Technical controls such as email filtering, endpoint protection and multi-factor authentication remain essential, but technology cannot remove every risk. Employees who understand the warning signs provide another valuable layer of defence.
Effective awareness should be continuous. Short training sessions, realistic phishing simulations and regular reminders are more useful than treating cyber awareness as a once-a-year tick-box exercise. The aim is not to catch people out. It is to help them build safer habits and make confident decisions when something does not look right.
Could Your Team Spot a Convincing Phishing Email?
Mistakes can happen in any organisation, but a strong security culture can reduce both the likelihood and the impact of an incident. The most important steps are to help employees pause, verify and report.
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