On September 18, 2001, the Nimda worm appeared, reportedly infecting hundreds of thousands of computers around the world. Nimda was a computer worm, and also a file infector. It quickly spread, eclipsing the economic damages caused by past outbreaks such as Code Red. Multiple propagation vectors allowed Nimda to become the Internet's most widespread virus/worm within 22 minutes. Nimda affected both user workstations (clients) running Windows 95, 98, Me, NT, 2000 or XP and servers running Windows NT and 2000.
|“||During the first 24 hours, Nimda spread through e-mail, corporate networks, and Web browsers, infecting as many as 150,000 Web server and personal computers (PCs) in the United States. The virus — 'admin' spelled backwards — was designed to affect PCs and servers running the Windows operating system and to resend itself every 10 days unless it was deleted. Nimda reproduced itself both via e-mail and over the Web — a user could be victimized by merely browsing a Web site that was infected. Furthermore, the infected machines sent out a steady stream of probes looking for new systems to attack. The additional traffic could effectively shut down company networks and Web sites; Nimda-generated traffic did not slow down the Internet overall, but infected companies reported serious internal slowdowns.||”|
External resource Edit
- CERT® Advisory CA-2001-26 Nimda Worm (Sept. 18, 2001, revised, Sept. 25, 2001) (full-text).
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