The rapid growth of digital technologies and networked systems has significantly increased the risk of cyber threats worldwide. Among these threats, ransomware has emerged as one of the most dangerous forms of malware due to its ability to encrypt user data and demand payment for its recovery. One of the most notable ransomware incidents in recent history is the global outbreak of WannaCry, which occurred in May 2017. The WannaCry attack spread rapidly across computer networks by exploiting a vulnerability in the Server Message Block (SMB) protocol of Microsoft Windows operating systems. This vulnerability was exploited using the EteralBlue exploit, which allowed the malware to propagate automatically between vulnerable systems without requiring user interaction. As a result, the attack infected more than 200,000 computers across over 150 countries within a short period of time, making it one of the largest and most disruptive cyberattacks in history. The objective of this research paper is to analyse the WannaCry ransomware attack from a technical, operational, and cybersecurity perspective. The study focuses on understanding the architecture and behaviour of the malware, the vulnerability exploited during the attack, the propagation mechanism used to spread across networks, and the overall impact on global digital infrastructure. The attack particularly affected critical sectors such as healthcare, banking, transportation, and telecommunications. One of the most widely reported incidents occurred in the United Kingdom where several hospitals operated by the National Health Service were forced to cancel appointments and medical procedures due to system failures caused by the ransomware infection. This incident highlighted the vulnerability of essential services to cyber threats and emphasized the importance of strong cybersecurity measures. The research methodology adopted in this study is based on a qualitative case study approach using secondary data collected from reliable sources such as security advisories issued by Microsoft, reports published by the National Cyber Security Centre, government cybersecurity alerts, academic journals, and technical research publications. These sources were analysed to understand the technical working of the ransomware, the timeline of the attack, and the strategies used by cybersecurity experts to contain the outbreak. The analysis also examines the discovery of the so-called “kill-switch” domain by a security researcher, which helped slow down the spread of the malware. In conclusion, the WannaCry ransomware attack serves as a critical case study for understanding modern cyber warfare and digital vulnerabilities. The lessons learned from this incident emphasize the importance of proactive cybersecurity measures, continuous monitoring of network systems, and rapid response mechanisms to mitigate potential cyber threats. By examining the technical structure and global impact of the WannaCry attack, this research aims to contribute to a better understanding of ransomware behaviour and to support the development of stronger cybersecurity frameworks for the protection of digital infrastructure.
WannaCry Ransomware, Cybersecurity, Malware Attack, EternalBlue Exploit, Data Encryption, Network Security, Microsoft Windows, Cyber Threats, Information Security, SMB Vulnerability.
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