From Phishing Attack to Stronger Security: A Client Case Study

9 March 2026

Cybersecurity is often viewed as a technical concern. In reality, it is a matter of business continuity and reputation management. Attack techniques continue to develop. Phishing, credential harvesting and ransomware campaigns increasingly target small and mid-sized organisations that assume they are unlikely to be targeted. In many cases, a single compromised account is enough to create operational disruption and reputational risk.

The Challenge

A new client approached Maple after experiencing a security incident involving unauthorised access to an executive email account. The organisation had standard security controls in place but had not yet implemented several modern protections that help reduce the risk of phishing-based compromise.

The incident began when an employee received an email that appeared to be a legitimate Microsoft password expiry notification. The message directed the employee to a website designed to imitate the Microsoft login page. Believing the message to be genuine, the employee entered their credentials, unknowingly providing the attacker with access to their account.

Within a short period of time, the attacker had successfully logged in and begun reviewing email communications.

Our Objective

Once the client contacted Maple, our immediate priority was to help contain the incident and determine the scope of the compromise. It was also important to understand whether any sensitive information had been accessed and whether further malicious activity had taken place.

Alongside the technical response, the client needed support in strengthening their overall security posture and ensuring that appropriate safeguards were put in place to reduce the likelihood of similar incidents in the future.

What We Did

The first step was to secure the compromised account and prevent further unauthorised access. Passwords were reset and account activity was reviewed to understand exactly what actions had been taken during the breach.

During this process, it became clear that the attacker had established ongoing mailbox access and had downloaded a portion of client correspondence. Fraudulent payment instructions had also been drafted within the mailbox. Fortunately, these messages were identified before being sent externally, preventing financial loss.

Once the immediate risk had been contained, we worked with the client to implement a layered security approach.

Key measures included:

• Multi-factor authentication across all user accounts and critical systems

• Advanced email filtering with anti-impersonation and phishing detection policies

• Endpoint detection and response software across company devices

• Dark web monitoring to detect potential credential exposure

• A formal incident response plan with clearly defined escalation procedures

We also introduced ongoing phishing simulation exercises to help measure employee awareness and improve the organisation’s ability to identify suspicious emails.

The Outcome

Over the following six months, the organisation saw clear improvements in its overall security posture.

Phishing simulation click rates reduced by more than 60 percent, demonstrating stronger employee awareness of phishing threats. At the same time, staff became more proactive in reporting suspicious emails, improving the organisation’s ability to detect and respond to potential threats at an early stage.

As part of the wider security improvements, the organisation also worked closely with Maple to strengthen its controls and processes in line with recognised security standards. This led to the successful achievement of Cyber Essentials certification, providing independent validation that key security measures were in place.

The strengthened security framework also allowed the organisation to successfully complete external cybersecurity due diligence when onboarding a new institutional client.

Cybersecurity is not achieved through a single product or tool. It requires coordinated controls, clear policies and continuous monitoring.

A breach can damage client trust in a matter of days. A structured and proactive security strategy helps protect it over the long term.

If your organisation is considering working towards Cyber Essentials certification, Maple can support you through the process, helping you review your current controls, address any gaps and prepare for a successful assessment. Get in touch with us.