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Memory To Go Special: New 2008 iMac 2GB $42 / iMac Intel Core2 DUO & MacBook Pro 2GB $36 - 1GB $20. MacPro 8 Core Memory 8GB kit $286 / 4GB kit $143 / 2GB kit $93 -- Free shipping available. LIfetime warranty.

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Entire Low End Mac website copyright ©1997-2008 by Cobweb Publishing, Inc., unless otherwise noted. All rights reserved. Advice presented in good faith, but what works for one may not work for all. Please report errors to .
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  PRIVACY: We don't collect personal information unless you explicitly provide it. For more details, see our Terms of Use.
  Low End Mac is an independent publication and has not been authorized, sponsored, or otherwise approved by Apple Inc. Apple, the Apple logo, Macintosh, iBook, iMac, eMac, iPod, iPhone, PowerBook, MacBook, MagSafe, Mac Pro, Apple TV, and AirPort are registered trademarks of Apple Inc. Additional company and product names may be trademarks or registered trademarks and are hereby acknowledged.


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Problems viewing this page with Internet Explorer 5.5 or 6? It works fine in other browsers, including IE 7. We recommend Firefox for those using Windows, as it is standards based and more secure than IE 6 (and earlier). More LEM visitors use Firefox than any other browser.

The Nimda Worm

The Nimda Worm

2001.09.18

Nimda came out of nowhere on September 18, 2001. It targets Windows computers, using individual networked PCs to infect NT-base servers running IIS. A Windows PC can become infected by opening or previewing an infected email, visiting a site on an infected server, or simply being on the same network as another infected Windows machine.

Windows servers can be infected by another server or PC on the same network or connecting over the Internet. Once a computer is infected, it will scan for other machines to infect. Once a server is infected, it will serve infected pages to visitors.

It may also be spreading via IRC and FTP.

Although Nimda can only infect Windows PCs, it can cripple servers running any operating system by hitting them persistently. As of 9:00 p.m. on Sept. 18, our Web log showed Low End Mac's Linux-based server had been hit almost 8,000 times:

989: /scripts/..%255c../winnt/system32/cmd.exe
988: /scripts/..%5c../winnt/system32/cmd.exe
500: /scripts/root.exe
499: /msadc/root.exe
498: /c/winnt/system32/cmd.exe
498: /d/winnt/system32/cmd.exe
497: /_vti_bin/..%255c../..%255c../..%255c../winnt/system32/cmd.exe
496: /_mem_bin/..%255c../..%255c../..%255c../winnt/system32/cmd.exe
495: /scripts/winnt/system32/cmd.exe
495: /msadc/..%255c../..%255c../..%255c/..%c1%1c../..%c1%1c../..%c1%1c../winnt/system32/cmd.exe
495: /scripts/..%c1%1c../winnt/system32/cmd.exe
494: /scripts/..%c0%af../winnt/system32/cmd.exe
493: /scripts/..%252f../winnt/system32/cmd.exe
493: /scripts/..%c1%9c../winnt/system32/cmd.exe

We received out first email with Nimda at 11.18 a.m. Here's the opening part of that message:

--====_ABC1234567890DEF_====
Content-Type: multipart/alternative;
	boundary="====_ABC0987654321DEF_===="
         
--====_ABC0987654321DEF_====
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
         
         
<HTML><HEAD></HEAD><BODY bgColor=3D#ffffff>
<iframe src=3Dcid:EA4DMGBP9p height=3D0 width=3D0>
</iframe></BODY></HTML>
--====_ABC0987654321DEF_====--
         
--====_ABC1234567890DEF_====
Content-Type: audio/x-wav;
	name="readme.exe"
Content-Transfer-Encoding: base64
Content-ID: <EA4DMGBP9p>

If you're setting up a filter, have it look for name="readme.exe" as a good place to start in separating Nimda from other incoming email.

The Nimda worm seeks out Windows servers running IIS. As the log indicates, Nimda is looking for cmd.exe and/or root.exe.

Links

<back to virus page>

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Our advertising is handled by BackBeat Media. For detailed price quotes and advertising information, please contactat BackBeat Media (646-546-5194). This number is for advertising only.

Entire Low End Mac website copyright ©1997-2008 by Cobweb Publishing, Inc., unless otherwise noted. All rights reserved. Advice presented in good faith, but what works for one may not work for all. Please report errors to .
  LINKS: We allow and encourage links to any public page as long as the linked page does not appear within a frame that prevents bookmarking it.
  Access our RSS news feed at http://lowendmac.com/feed.xml.
  Email may be published at our discretion; email addresses will not be published without permission, and we will encrypt them in hopes of avoiding spammers. If you prefer your message not be published, mark it "not for publication." Letters may be edited for length, context, and to match house style.
  PRIVACY: We don't collect personal information unless you explicitly provide it. For more details, see our Terms of Use.
  Low End Mac is an independent publication and has not been authorized, sponsored, or otherwise approved by Apple Inc. Apple, the Apple logo, Macintosh, iBook, iMac, eMac, iPod, iPhone, PowerBook, MacBook, MagSafe, Mac Pro, Apple TV, and AirPort are registered trademarks of Apple Inc. Additional company and product names may be trademarks or registered trademarks and are hereby acknowledged.