: A sophisticated worm that created a massive botnet of millions of infected Windows computers, targeting government and business servers.
: A worm that exploited a vulnerability in Microsoft IIS web servers to launch DDoS attacks, including one targeting the White House website. The Top 10 Worst PC Viruses of All Time – AZMATH
: A tiny but powerful worm that slowed the entire internet to a crawl in just minutes by targeting SQL servers. : A sophisticated worm that created a massive
: 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
: A fast-spreading worm that caused roughly $30 billion in damage by overloading corporate servers with millions of emails.