Learn how hackers steal bank card data from financial institutions and what businesses can do to reduce cyber risks and protect their systems.
For most people, the idea of hackers breaking into a bank and stealing billions of euros still sounds like the plot of a Hollywood thriller. But in reality, incidents like this have already happened — and they are far more common, and far less dramatic in their execution, than most people expect.
A recent documentary on international hacker groups brought one such case back into the spotlight. A criminal network had quietly infiltrated banking systems, used manipulated credit cards and coordinated ATM withdrawals to drain accounts repeatedly, and managed to operate undetected long enough to accumulate losses that reportedly reached into the billions. For a while, the criminals seemed untouchable. They spent lavishly, moved across borders, and believed they had outsmarted the system entirely.
What makes this case so significant, however, is not the scale of the theft — it is what it reveals about how these attacks actually work. The hackers did not rely on extraordinarily sophisticated technology or theoretical vulnerabilities that only exist in research labs. They succeeded because small, overlooked security weaknesses were left unaddressed for too long. And that is a pattern that repeats itself across industries, company sizes, and countries. This article takes a closer look at how attacks like this become possible, what warning signs organizations often miss, and what practical steps businesses can take to reduce their exposure to exactly this kind of threat.
How Attacks Like This Become Possible
Major cyber incidents rarely happen because of a single dramatic breach. In most cases, attackers succeed by exploiting a combination of weaknesses inside an organization — and what makes this particularly dangerous is how gradually it unfolds. Cybercriminals typically begin with a small, almost invisible entry point and then patiently work their way deeper into the system over days, weeks, or even months.
One of the most common starting points is stolen login credentials. Attackers may obtain usernames and passwords through phishing emails or through data leaks from other websites, and because many people reuse the same passwords across multiple services, this alone can be enough to open the door to business accounts or internal systems. From there, the attacker no longer looks like an outsider — they look like a legitimate user.
A second pathway involves malware planted inside internal networks. A malicious email attachment or an infected download can silently install software that monitors activity, captures keystrokes, or establishes a remote connection back to the attacker. Once inside, criminals often move laterally from one machine to another, gradually working their way toward more sensitive systems and higher levels of access.
Unpatched software vulnerabilities contribute significantly as well. When organizations delay applying security updates, known weaknesses remain exposed — and cybercriminal groups actively scan the internet for systems running outdated software, targeting them in an almost automated fashion. The vulnerability does not need to be new or sophisticated; it simply needs to be overlooked.
What ties all of these entry points together is a common organizational gap: insufficient monitoring. Unusual login attempts, abnormal transaction patterns, and unexpected system behavior can go entirely unnoticed without the right detection tools in place. This is precisely what allows attackers to remain hidden for so long. They observe, they learn, and they adapt — and only once they have fully mapped the environment do they launch the final operation, whether that means stealing financial data, manipulating transactions, or deploying ransomware.
These cases ultimately illustrate that successful cyberattacks rarely rely on a single mistake. They happen when several small security gaps exist at the same time and go unaddressed. Strengthening each individual layer of security — credentials, endpoints, patch management, and monitoring — is therefore not optional. It is what makes the difference between an attack that fails and one that succeeds.
Cyber threats continue to evolve rapidly. Many organizations still underestimate how quickly new attack methods appear. Businesses that want to better understand the current threat landscape can explore our detailed guide on Cybersecurity 2026: The Biggest Risks for Businesses – and How to Protect Your Company.
Why Cybercriminals Often Succeed for So Long
One of the most unsettling aspects of major cyber incidents is not the sophistication of the attack itself — it is how long attackers manage to remain active before anyone notices. In many documented cases, criminal groups operated inside company networks for weeks or even months without triggering a single alarm. And in most of these cases, the reason was not that they used futuristic tools or exploited theoretical vulnerabilities. They succeeded because very common, well-known security weaknesses had simply been left unaddressed.
Weak or reused passwords remain one of the most persistent entry points. When employees use the same password across multiple services — or choose passwords that are easy to guess — a single compromised account from a previous data breach can be enough to unlock access to entirely unrelated systems. The attacker does not need to break anything. They simply log in.
Unsecured remote access systems present a similar risk. As more organizations allow employees to connect to internal networks from outside the office, remote desktop tools and VPN connections have become attractive targets. Without strong authentication and active monitoring, these systems can function as an open door — one that attackers can approach quietly, at any time, without drawing attention.
Delayed software updates compound the problem further. Security patches exist precisely because vulnerabilities have been found and fixed, but when organizations postpone updates, those vulnerabilities remain exploitable. Cybercriminal groups know this, and many of them systematically scan the internet for systems still running outdated software. They do not need to discover a new weakness — they simply look for organizations that have not yet closed the old ones.
Human behavior, however, remains the most consistently exploited factor of all. Phishing emails that appear to come from a trusted colleague, a bank, or a familiar service provider can be surprisingly convincing, and a single click on a malicious link or a login entered on a fake website is often all it takes to give attackers their first foothold. Without regular, practical security awareness training, employees are left to make these judgment calls without the knowledge they need.
What makes this landscape even more challenging is the level of organization that now operates behind these attacks. Many criminal groups no longer function like a loose collection of opportunistic hackers. They operate more like structured businesses — dividing responsibilities between members, developing specialized tools, managing stolen data, and in some ransomware operations, even running what resembles a customer support function for victims. This organizational maturity allows them to work patiently and strategically, testing entry points, mapping internal systems, and waiting for exactly the right moment to act.
It is this combination — common vulnerabilities, human error, and professional criminal organization — that explains why so many attacks go undetected for so long. The technical barrier to entry is often lower than organizations assume. What attackers rely on, more than anything else, is time.
Many cyberattacks begin with phishing emails that appear to come from trusted sources such as banks, colleagues, or service providers. If employees are not trained to recognize suspicious messages, they may unknowingly reveal sensitive information. These techniques are part of a broader strategy known as social engineering. You can learn more about this topic in our article Social Engineering: How Hackers Trick You in Daily Life.
The Biggest Misconception Many Companies Have
Perhaps the most dangerous belief in cybersecurity is also one of the most common: the assumption that attackers are only interested in banks, global corporations, or government institutions. Many smaller organizations operate under the quiet conviction that they are simply not worth a hacker’s time — that their data is not valuable enough, their systems not prominent enough, and their name not recognizable enough to attract serious attention. It is a reassuring thought. It is also wrong.
Cybercriminals are not browsing headlines looking for famous brands to target. They are scanning the internet for vulnerable systems — weak passwords, unpatched software, misconfigured remote access tools. When automated scanning tools find an exploitable weakness, the size or reputation of the company behind it is largely irrelevant. What matters is whether the door is open. And for many small and medium-sized businesses, it is.
In fact, smaller organizations are frequently targeted precisely because their defenses tend to be weaker. Limited budgets, fewer dedicated security staff, and less structured employee training all create an environment where basic protections are often missing or inconsistently applied. For an attacker weighing their options, a smaller company with minimal security controls can be a far more attractive opportunity than a large enterprise with a dedicated security team and mature monitoring systems.
There is also a second dimension to this risk that is easy to overlook. Many smaller businesses are part of larger supply chains — as suppliers, service providers, or contractors with direct digital connections to bigger organizations. Attackers understand this. Compromising a smaller partner can serve as a stepping stone into a far more valuable network, one that would otherwise be much harder to reach. The weakest link in a supply chain is rarely the largest company in it.
This is why the question of cybersecurity relevance is not actually about company size. It is about connectivity and exposure. Any organization that relies on digital systems, handles customer data, or operates as part of a broader business network carries risk — and that includes organizations that have never once considered themselves a potential target. Recognizing that is not cause for alarm. It is simply the first step toward doing something about it.
Many companies still believe they are too small to become a target. This assumption can be extremely dangerous. As explained in our article I’m Too Small to Be a Hacker” – The Most Expensive Mistake in the Middle Class, cybercriminals often prefer smaller companies because they tend to have weaker security protections.
The Most Important Lesson From the £9 Billion Hack
The story behind large banking cyberattacks shows an important reality about modern cybercrime. In many cases, the most dangerous element is not the final attack itself. Instead, the real problem lies in the small vulnerabilities that remain unnoticed inside an organization for a long time.
Cybercriminals rarely break into systems instantly. They usually begin by searching for weaknesses such as poorly protected accounts, outdated software, or unmonitored systems. Once they discover an entry point, they carefully explore the network and collect information about how systems and processes work.
If these weaknesses remain undetected, attackers can slowly expand their access and move deeper into the organization’s infrastructure. By the time the final attack becomes visible—such as stolen financial data or manipulated transactions—the criminals may have already spent weeks or months inside the system.
This is why the most important lesson from incidents like the billion-dollar banking hack is not about the size of the attack. The real lesson is that cybersecurity must focus on preventing small weaknesses before they can be exploited. To reduce the risk of such attacks, companies should focus on several fundamental cybersecurity practices.
Strong password and access management policies are essential. Employees should use complex passwords and avoid reusing the same credentials across multiple systems. Multi-factor authentication can add an additional layer of protection. Organizations should also ensure regular system updates and patch management. Software updates often contain important security fixes. When systems remain outdated, they create opportunities for attackers to exploit known vulnerabilities.
Another critical measure is monitoring unusual network or financial activity. Suspicious login attempts, unexpected data transfers, or abnormal transaction patterns can be early warning signs of a cyberattack. Detecting these signals early can prevent attackers from gaining deeper access.
Finally, companies should invest in employee awareness training against phishing and social engineering. Many cyber incidents begin with a simple email that tricks someone into clicking a malicious link or revealing login credentials. Educated employees are often the first and most effective line of defense.
In the end, large cyberattacks rarely happen because of a single catastrophic mistake. They usually develop when several small weaknesses exist at the same time. By strengthening basic cybersecurity practices, organizations can significantly reduce the chances of becoming the next victim.
What Role Russia Plays in Cyber Warfare
In many discussions about cyber warfare, Russia is often mentioned as one of the most active players in the digital conflict landscape. Over the past two decades, several hacker groups connected to Russian networks have been linked to large cyberattacks, financial fraud operations, and espionage campaigns targeting governments, companies, and institutions around the world.
One reason for this is the complex relationship between cybercriminal groups and the state. In some cases, hacker groups operate independently and focus on financial crime, such as stealing banking data or conducting ransomware attacks. However, security experts often point out that these groups may remain largely untouched as long as they avoid attacking domestic systems or organizations inside their own country.
This situation has allowed some cybercrime networks to grow over time and develop highly sophisticated skills. Many of these groups operate in organized structures, share tools and knowledge, and collaborate through underground forums and digital marketplaces. As a result, some hacker networks have become extremely professional and capable of launching complex cyber operations.
Cyber activities are also part of what security experts describe as “hybrid warfare.” In modern conflicts, countries may combine traditional military power with cyber operations, disinformation campaigns, and digital espionage. These strategies can be used to influence political systems, disrupt infrastructure, or create economic pressure on other nations without direct military confrontation.
However, it is important to understand that cybercrime and cyber warfare are not limited to a single country. Hacker groups and cybercriminal networks exist in many parts of the world. Cyberattacks may originate from different regions, and attackers often operate across international borders.
For businesses and organizations, the key lesson is therefore not only where attackers come from, but how to build stronger cybersecurity defenses. As cyber threats become more organized and professional, companies must focus on prevention, awareness, and strong security practices to protect their systems and sensitive data
How Hackers Can Often Gain Access Relatively Easily
Many people imagine that hackers break into systems using extremely complex tools.
In reality, attackers often start with much simpler methods. One of the most common techniques is phishing. Criminals send emails that look like legitimate messages from banks, colleagues, or service providers. If someone clicks a malicious link or enters their login details, the attackers can gain access to accounts or internal systems.
Another frequent method involves malware. A victim may download an infected file or open a compromised attachment. Once the malware is installed, it can collect passwords, record keystrokes, or give hackers remote access to the computer. Hackers also target poor password practices. Many people still reuse the same password for multiple services. If attackers obtain login credentials from one compromised website, they can try the same credentials on other platforms, including banking systems or business accounts.
Finally, cybercriminals sometimes exploit unpatched software vulnerabilities. If systems are not regularly updated, attackers may be able to enter networks through known security weaknesses. For this reason, many successful cyberattacks do not begin with advanced hacking techniques. Instead, they start with small mistakes, weak security habits, or outdated systems that attackers can exploit.
Conclusion: How hackers steal bank card data from financial institutions
The story of large banking cyberattacks shows that cybercrime is no longer a rare event. Today, organized hacker groups actively search for weaknesses in financial systems, payment networks, and company infrastructure. In many cases, attackers do not rely on highly complex technology. Instead, they exploit simple mistakes, weak passwords, phishing emails, or outdated software.
The lesson for businesses is clear. Cybersecurity must become a priority for every organization that works with digital systems or financial data. Regular updates, strong access controls, employee awareness training, and continuous monitoring are essential steps to reduce the risk of attacks. Understanding how hackers steal bank card data from financial institutions is not only important for banks themselves.
It also helps companies recognize how cybercriminals think and how attacks often begin. By strengthening cybersecurity practices today, organizations can significantly reduce their chances of becoming the next target. In a digital world where cyber threats continue to grow, prevention and awareness remain the most effective defenses.
Cyber threats continue to evolve, and staying informed is essential. If you are interested in cybersecurity insights, risk awareness, and practical protection strategies for businesses, feel free to follow or connect with me on LinkedIn
