Three Scenarios of Real Cyberattacks: From the Entry Point to Critical Data

A company learned about a breach not from its own security systems, but from a bank that blocked suspicious transactions or from a client who discovered their data had been publicly exposed. By that time, the attacker had already left, but not before taking everything they wanted.

This is a fairly typical story of cyber incidents caused by a weak password that included the company name, a web app running on an outdated library, or an email appearing to come from the IT department requesting account verification.

How most attacks actually begin

Often, a real attack starts with exploiting a known vulnerability that the company failed to remediate: an unpatched component, excessive access permissions that were never removed, or the absence of multi-factor authentication.

An attack does not progress in a single leap. It moves through a chain of actions, with each step building on the previous one. This chain can be stopped at any stage, but only if you understand where it begins and where it leads.

Scenario 1: To the corporate network – through a weak password

The attacker starts with public sources: LinkedIn, the corporate website, and open databases. Finding an employee's email address is often enough to get started. From there, they may check leaked credential databases or try simple variations: company name, year, standard combinations.

Using the permissions associated with that account, the attacker moves further through the network, gaining access to shared folders, internal services, or admin panels. If access controls are misconfigured or network segmentation is weak, they can gradually expand their privileges and gain access to critical systems, including servers and databases.

The company is unlikely to notice this immediately. The activity is performed using a legitimate account and often appears indistinguishable from normal day-to-day operations.

Scenario 2: From a vulnerability in a web application to the internal network

The attacker scans the company's public website or application. They find an unpatched vulnerability. For example, an SQL injection or an outdated component with a known CVE. Through it, they gain access to the database or the ability to execute commands on the server.

The hacker then moves deeper into the infrastructure to reach critical systems: internal services, domain controllers, and corporate data.

Scenario 3: From phishing to ransomware or a data leak

An employee receives an email supposedly sent by HR or the IT department. The email asks them to follow a link to verify their account or download a document for review.

The employee follows the link and enters their username and password on a fake page or downloads a file that establishes malicious code on the workstation. The attacker gains a foothold inside the network. They can then remain undetected for weeks: studying the infrastructure, collecting data, and gathering higher access levels.

What unites all these scenarios

In all three cases, the attack begins with a single entry point. The attacker then moves laterally through the network, not by breaking everything in their path, but by using existing access and trust between systems. The company may not notice the attack because it appears to be normal activity performed by a legitimate user.

This is why it is important to periodically assess a system's security to identify and close entry points before attackers can exploit them to reach critical assets. This is where penetration testing becomes valuable.

How a pentest helps identify attack plans

A penetration test is a controlled simulation of a cyberattack. Whether conducted internally or through a penetration testing service, the goal is to identify potential attack paths by following the same logic a real attacker might use to move through a system. The assessment is performed in a controlled environment and within agreed boundaries.

The value of such a security verification method is not in a mere list of vulnerabilities itself, but in demonstrating a real attack path: “here is a weak password → here is where it can lead → here is what can be accessed there and what business impact it could cause.”

What a pentest reveals and what a scanner does not see

• Complex attack chains that combine several “insignificant” vulnerabilities into one real scenario.
• Incorrect access configurations, unnoticed in isolation but critical in combination.
• Vulnerabilities due to the human factor or the system's business logic – no automatic scanner can model this.
• Real impact: “this vulnerability allows reaching the customer database”, rather than just “found CVE with a medium risk level.”

When you should order a pentest

• Before launching a new product, application, or service.
• After significant changes to the infrastructure or codebase.
• If the company has never conducted an independent security review.
• After suspicious activity or an incident, to understand if the attack was long-term and how far it went.