Feeds

Firms hit in Nimda mutant outbreak

Variations on a theme

  • alert
  • submit to reddit

Seven Steps to Software Security

Dozens of firms have been infected by the latest mutation of Nimda.

But the outbreak is much less serious than in September, when the contagious worm made its first outing on the Internet. Even so, anti-virus vendors advise users to beware attachments called: "SAMPLE.EXE" (instead of "README.EXE" which appeared in the original Nimda worm).

Jack Clark, product marketing manager for the McAfee division of Network Associates, said the latest modification to Nimda "was not spreading like variants in the past because people have largely put detection in place".

Antivirus experts have discovered five Nimda variants - full definitions can be seen here. This is unlikely to be the final word from virus writers on the subject.

Nimda spreads through several means, ranging from simply viewing an infected web page using a browser with the security features switched off, to opening a malicious email attachment. It can also spread through network shares.

As well as penetrating workstations, Nimda attacks Web servers running under Microsoft Internet Information Server (IIS), using the Web Server Folder Traversal vulnerability. If Nimda gets onto your network, it creates bandwidth-wasting activity, by scanning the network like mad.

AV vendors are updating signature definition files to pick up the latest Nimda variant ®

Related Stories

'Nimda fix' Trojan disguised as security bulletin
Nimda worm runs riot on IT sites
Nimda worm tails off
Teenage Mutant Nimda email rides the Code Red worm
Virus writers are industrial terrorists - MS
MS issues bum security patch, contradicts self
MS says stop discussing hack exploits
Can IIS flourish post-Gartner?
Microsoft (finally) tries to make IIS secure

Mobile application security vulnerability report

More from The Register

next story
Yorkshire cops fail to grasp principle behind BT Fon Wi-Fi network
'Prevent people that are passing by to hook up to your network', pleads plod
HIDDEN packet sniffer spy tech in MILLIONS of iPhones, iPads – expert
Don't panic though – Apple's backdoor is not wide open to all, guru tells us
NEW, SINISTER web tracking tech fingerprints your computer by making it draw
Have you been on YouPorn lately, perhaps? White House website?
LibreSSL RNG bug fix: What's all the forking fuss about, ask devs
Blow to bit-spitter 'tis but a flesh wound, claim team
Attackers raid SWISS BANKS with DNS and malware bombs
'Retefe' trojan uses clever spin on old attacks to grant total control of bank accounts
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
Mozilla fixes CRITICAL security holes in Firefox, urges v31 upgrade
Misc memory hazards 'could be exploited' - and guess what, one's a Javascript vuln
Don't look, Snowden: Security biz chases Tails with zero-day flaws alert
Exodus vows not to sell secrets of whistleblower's favorite OS
prev story

Whitepapers

Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Reducing security risks from open source software
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.