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Malware software targeted legitimate Windows files

Security vendor Malwarebytes has crippled thousands of computers around the world after a faulty update was applied to its software. The faulty security update applied to the software marked legitimate system files as malware code.

The company admitted to the problem on its official blog earlier this week and has since pulled the faulty update.

"At around 3PM PST yesterday [Tuesday] Malwarebytes released a definitions update that disabled thousands of computers worldwide," wrote Malwarebytes’ Marcin Kleczynski.

"Within eight minutes, the update was pulled from our servers. Immediately thereafter, users flocked to our support helpdesk and forums to ask us for a fix."

The specific operating system files that the malware update targeted included Windows.dll and.exe files. By targeting those files, the security application prevented them from running, taking IT systems and individual computers off-line.
One company that uses a software claims that the update knocked 80% of its servers off-line. Malwarebytes maintains that it has begun reworking its update policy to ensure the sort of mistake never happens again.

"We acted over-zealously in that mission and realise far superior procedures around updating are needed. More was expected of us, and we failed," wrote Kleczynski.

"We are commissioning several new resources to stop this from happening again. We are building more redundancy to check our researchers' work and improving our peer review."

Source: V3

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RE: Effective but risky ...
By Motoman on 4/18/2013 12:26:20 PM , Rating: 3
History has proven the worst for the big traditional brand names, like Norton and McAfee.

This is the first such issue I've ever heard of for Malwarebytes. And compared to the massive cockups of Norton & McAfee, from the sounds of this issue it's kind of a rounding error.

RE: Effective but risky ...
By Mitch101 on 4/18/2013 1:00:06 PM , Rating: 2
In McAffee's case Ive seen it flag its own virus definition updates as infected.

I just bought several copies of Malware bytes and think Ill wait till this weekend to install so they get it ironed out.

This happens to every vendor but thanks for the article DT may have saved me 3 rebuilds but Ill image them before I install just to be sure.

RE: Effective but risky ...
By RjBass on 4/18/2013 1:37:00 PM , Rating: 3
Not knowing about this, i downloaded, installed and updated Malwarebytes on a co-workers computer today. Had to run a scan for something she got into a week ago. She is a kindergarten teacher and about once an hour her computer would erupt into music and explicit conversations, much to the amusement and dismay of her students.

Malwarebytes did just fine, and didn't cripple anything, and now her computer is free from the problem. So that being the case, I can only assume the latest update is ok for use.

RE: Effective but risky ...
By random2 on 4/24/2013 10:03:52 PM , Rating: 2
This is one of the reasons I try to remove this piece of malware (McAfee) from PCs every chance I get. That and any Norton/Symantec product. System speed up is immediately apparent when these invasive, resource hungry programs are flushed.

RE: Effective but risky ...
By Motoman on 4/18/2013 7:59:07 PM , Rating: 2
Oh look, the children are downrating me again for pointing out reality. As they frequently do.

Spend 2 seconds on Google to find this stuff from just a couple years ago:

With a flick of a switch, metaphorically speaking, McAfee (and Symantic and Norton) have in the past, more than once, effectively bricked hundreds of thousands of computers worldwide, and brought many corporations to their knees.

Sure...AVG, Avast, and now Malwarebytes have all had problems too. But nothing on the scale of what the "big guys" have done.

I'll note that I also became a non-fan of Microsoft Security Essentials a while ago - for a long time I'd been happily recommending and installing it on people's PCs. But on at least 3 computers now I've seen MSE absolutely borked by malware to the point where you can't really ever make it work again.

So...I went back to AVG as the primary recommendation. With the free version of Malwarebytes for an additional manual scan once in a while.

"If they're going to pirate somebody, we want it to be us rather than somebody else." -- Microsoft Business Group President Jeff Raikes

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