Feeds

Klez tops virus charts – again

No sign of let-up

  • alert
  • submit to reddit

Choosing a cloud hosting partner with confidence

Variants of the Klez worm were by far the most common viruses circulating on the Internet this month. Again.

That's according to monthly statistics from managed services firm MessageLabs, which stopped 788,137 copies of the virus in June, compared to 524, 507 in May.

Virus infection rates are currently running at around one per 240 emails, which compares to one in 30 infected emails at the heights of the Goner and Love Bug epidemics, MessageLabs reports.

Klez became the worst virus ever in May, and it shows no sign of abating, according to the firm

Other viruses were much less common. The next most common virus, Yaha, was blocked only 67,146 times by MessageLabs during the last four weeks. However Yaha has become a major irritant at Vulture Central because of its capacity to spew hundreds of infectious emails to a single address from infected machines.

Very irritating.

Klez cleanup

Klez is a mass-mailing worm which searches the Windows address book for email addresses and sends messages to all recipients that it finds. The worm uses its own SMTP engine to send the messages. It can also spoof the 'From' in messages, a factor which has resulted in widespread confusion about the bug.

The subject and attachment name of incoming emails is randomly chosen, making it harder for users to spot. The attachment will have one of the following extensions: .bat, .exe, .pif or .scr. Klez is capable of infecting files.

The worm exploits a vulnerability in Microsoft Outlook and Outlook Express in an attempt to execute itself when you open or even preview the message. Information and a patch for the vulnerability can be found here. ®

Top ten viruses blocked by MessageLabs in June


  1. Klez-H
  2. Klez-E
  3. Yaha-E
  4. SirCam
  5. VBSWG.AQ
  6. Magistr-B
  7. Hybris-B
  8. Magistr-A
  9. Yaha-C
  10. Frethem-F

    External Links

    Analysis of the spread of the Klez-H worm by MessageLabs

    Related Stories

    Klez-H is the worst virus ever - official
    Klez storms monthly virus charts
    Virus writers outpace traditional AV

Secure remote control for conventional and virtual desktops

More from The Register

next story
Regin: The super-spyware the security industry has been silent about
NSA fingered as likely source of complex malware family
Why did it take antivirus giants YEARS to drill into super-scary Regin? Symantec responds...
FYI this isn't just going to target Windows, Linux and OS X fans
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Patch NOW! Microsoft slings emergency bug fix at Windows admins
Vulnerability promotes lusers to domain overlords ... oops
HACKERS can DELETE SURVEILLANCE DVRS remotely – report
Hikvision devices wide open to hacking, claim securobods
'Regin': The 'New Stuxnet' spook-grade SOFTWARE WEAPON described
'A degree of technical competence rarely seen'
Astro-boffins start opening universe simulation data
Got a supercomputer? Want to simulate a universe? Here you go
You stupid BRICK! PCs running Avast AV can't handle Windows fixes
Fix issued, fingers pointed, forums in flames
prev story

Whitepapers

Driving business with continuous operational intelligence
Introducing an innovative approach offered by ExtraHop for producing continuous operational intelligence.
Why CIOs should rethink endpoint data protection in the age of mobility
Assessing trends in data protection, specifically with respect to mobile devices, BYOD, and remote employees.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Simplify SSL certificate management across the enterprise
Simple steps to take control of SSL across the enterprise, and recommendations for a management platform for full visibility and single-point of control for these Certificates.