: 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 botnet of millions of infected Windows computers, targeting government and business servers.
: The first major mass-mailing virus of the modern era, which forced many large companies like Microsoft to shut down their email systems entirely. The Top 10 Worst PC Viruses of All Time – AZMATH
: A worm that exploited a vulnerability in Microsoft IIS web servers to launch DDoS attacks, including one targeting the White House website.
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 : A fast-spreading worm that caused roughly $30
: Widely considered the costliest outbreak in history, causing an estimated $38 billion in damages (over $52 billion adjusted for inflation).
: An advanced Trojan horse used to steal banking information, reportedly affecting 88% of Fortune 500 companies. : A worm that exploited a vulnerability in
: One of the most famous social engineering attacks, disguised as a love letter that, once opened, sent itself to everyone in the victim's Outlook address book.