: A tiny but powerful worm that slowed the entire internet to a crawl in just minutes by targeting SQL 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.
: Widely considered the costliest outbreak in history, causing an estimated $38 billion in damages (over $52 billion adjusted for inflation). The Top 10 Worst PC Viruses of All Time – AZMATH
: 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.
: An advanced Trojan horse used to steal banking information, reportedly affecting 88% of Fortune 500 companies. : A tiny but powerful worm that slowed
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
: Notorious for spoofing sender addresses, making it appear as though the virus came from a trusted contact. : One of the most famous social engineering
: A worm that exploited a vulnerability in Microsoft IIS web servers to launch DDoS attacks, including one targeting the White House website.