Feeds

Klez tops virus charts – again

No sign of let-up

  • alert
  • submit to reddit

Protecting against web application threats using SSL

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

Reducing the cost and complexity of web vulnerability management

More from The Register

next story
Spies would need SUPER POWERS to tap undersea cables
Why mess with armoured 10kV cables when land-based, and legal, snoop tools are easier?
Early result from Scots indyref vote? NAW, Jimmy - it's a SCAM
Anyone claiming to know before tomorrow is telling porkies
Apple Pay is a tidy payday for Apple with 0.15% cut, sources say
Cupertino slurps 15 cents from every $100 purchase
Israeli spies rebel over mass-snooping on innocent Palestinians
'Disciplinary treatment will be sharp and clear' vow spy-chiefs
YouTube, Amazon and Yahoo! caught in malvertising mess
Cisco says 'Kyle and Stan' attack is spreading through compromised ad networks
Hackers pop Brazil newspaper to root home routers
Step One: try default passwords. Step Two: Repeat Step One until success
China hacked US Army transport orgs TWENTY TIMES in ONE YEAR
FBI et al knew of nine hacks - but didn't tell TRANSCOM
Microsoft to patch ASP.NET mess even if you don't
We know what's good for you, because we made the mess says Redmond
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
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?
Security and trust: The backbone of doing business over the internet
Explores the current state of website security and the contributions Symantec is making to help organizations protect critical data and build trust with customers.