Microsoft's botnet take-down helps protect Mac users

Side effect of Kelihos botnet disruption kills domains used to spread MacDefender scareware
  • (Computerworld (US))
  • — 29 September, 2011 05:27

Mac users can thank Microsoft for taking down a small but dangerous botnet.

On Monday, at the request of Microsoft, a Virginia federal judge ordered VeriSign to shut down nearly two dozen domains linked to servers that controlled the Kelihos botnet.

One of those domains -- cz.cc -- had hosted machines that distributed waves of fake Mac antivirus software for weeks last spring, according to Microsoft and several security companies.

The fake programs, called "scareware" or "rogueware," began hitting users in early May and continued for nearly two months. Like similar -- and much more prevalent -- software aimed at Windows PCs, the Mac scareware falsely claimed that the computer was heavily infected. Once installed, phony antivirus software nags users with pop-ups and fake alerts until they fork over a fee to purchase the worthless program.

Microsoft noted that the cz.cc domain had "previously been investigated for hosting subdomains responsible for delivering MacDefender," the most-used name of the Mac scareware.

A pair of security companies that analyzed MacDefender in May and June confirmed Microsoft's contention today.

Among the subdomains serving up MacDefender, said both French-based Intego and U.K.-headquartered Sophos, were ones under the cz.cc domain that VeriSign shuttered.

"The sites that were leading you to MacDefender were diverse and most often compromised .com sites," said Chet Wisniewski, a Sophos security researcher, talking about how users were redirected from hacked sites to those actually pushing scareware to Macs. "I can't confirm that MacDefender was exclusively distributed through cz.cc, but anecdotally I can say it was a high percentage."

But both Wisniewski and Peter James, a spokesman for Intego, said that Microsoft's take-down was, in fact, largely moot.

"MacDefender started disappearing after the arrest of Pavel Vrublevsky in June," said Wisniewski, referring to the man who was charged with hacking into a rival of ChronoPay , a Russian company that allegedly processed credit card payments for scareware spreaders.

Vrublevsky's arrest had followed an operation in the U.S. and several other countries where authorities busted cyber gangs responsible for distributing massive amounts of scareware to Windows PCs.

Operation Trident Tribunal had targeted criminals who purportedly infected nearly a million PCs with scareware, and raked in $72 million in revenues from the scam.

"[MacDefender] seems to have faded away," agreed James of Intego. "I think a combination of the amount of press it got, and some arrests of people behind fake antivirus, stopped it or made it go dormant."

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer , on Google+ or subscribe to Gregg's RSS feed . His e-mail address is gkeizer@computerworld.com .

See more articles by Gregg Keizer .

Read more about security in Computerworld's Security Topic Center.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Gregg Keizer

Computerworld (US)
Topics: VeriSign, Mac OS, security, Microsoft, software, Intego, operating systems
Comments are now closed.

Latest News Articles

Most Popular Articles

Follow Us

GGG Evaluation Team

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell

LIFEBOOK UH574

The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi

STYLISTIC Q702

The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott

STYLISTIC Q702

My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Resources

Best Deals on GoodGearGuide

Compare & Save

Deals powered by WhistleOut
WhistleOut

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?