: A sophisticated worm that created a massive botnet of millions of infected Windows computers, targeting government and business servers.
: An advanced Trojan horse used to steal banking information, reportedly affecting 88% of Fortune 500 companies. The Top 10 Worst PC Viruses of All Time – AZMATH
: A fast-spreading worm that caused roughly $30 billion in damage by overloading corporate servers with millions of emails. : A sophisticated worm that created a massive
: A massive ransomware attack that encrypted files and demanded Bitcoin payments, famously crippling the UK's National Health Service. : A massive ransomware attack that encrypted files
: Widely considered the costliest outbreak in history, causing an estimated $38 billion in damages (over $52 billion adjusted for inflation).
While "AZMATH" appears to be a specific niche or community-driven list, the consensus across major tech resources like HP Tech Takes and Britannica highlights a consistent group of notorious digital threats. These viruses and worms are ranked by their financial impact, speed of infection, and sheer destructive capability. The Top 10 Most Notorious PC Viruses