This ebook traces the evolution of ransomware from the 1989 AIDS Trojan to today's highly sophisticated double-extortion campaigns targeting governments, healthcare organizations, critical infrastructure, financial institutions, and global enterprises. Through real-world case studies—including Reveton, WannaCry (EternalBlue), SamSam, UCSF, Ragnar Locker, CNA Financial, Colonial Pipeline, Kaseya, St. Margaret's Health, PharMerica, and the MOVEit breach—it demonstrates how attack methods have evolved from simple encryption to supply-chain attacks, data theft, and ransomware-as-a-service (RaaS). The guide explains common attack vectors such as phishing, zero-day exploits, brute-force attacks, and malicious software updates while emphasizing the growing financial and operational consequences o

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