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Microsoft Security Essentials Was Wiping Chrome Off PCs

Gizmodo AU

Yikes. A recent virus definition update for Microsoft’s free Security Essentials anti-malware software briefly had the program identifying Google Chrome as a trojan, specifically “PWS:Win32/Zbot”.

According to Microsoft’s virus database, Win32/Zbot is a “password-stealing trojan that monitors for visits to certain websites. It allows limited backdoor access and control and may terminate certain security-related processes.”

Of course, Google hadn’t slipped a trojan into its browser on the sly — it was a false positive on MSE’s part. Unfortunately, MSE was fully capable of deleting Chrome without user consent, if the program’s default actions were set accordingly. Otherwise, the worst it could do was block Chrome from accessing the internet.

The issue has since been rectified, with definition versions 1.113.672.0 and above vendetta-free. But, if you were unfortunate enough to get the update and find Chrome mysteriously gone moments later, then here’s the why.

Image: Wikipedia

Encyclopaedia Entry: PWS:Win32/Zbot [Microsoft, via The Australian]

Discuss

(14 Comments)
  • [–]

    Dan

    Monday, October 3, 2011 at 2:23 PM

    On purpose…

  • [–]

    Drew

    Monday, October 3, 2011 at 2:36 PM

    Can’t you read? They said it was an accident! Sure….

  • [–]

    Liam Johnson

    Monday, October 3, 2011 at 2:36 PM

    “Accidentally”. Sure. More like to boost IE9 use.

    .

    • [–]

      Liam Johnson

      Monday, October 3, 2011 at 2:37 PM

      Apparently, I can’t use the sarcasm tag -.-

      • [–]

        Logan Booker

        Monday, October 3, 2011 at 2:41 PM

        I got it, Liam, so don’t worry. :)

        Hypothetically, even if it had been some crazy conspiracy to boost IE9 stats, it only knocked out 3000-or-so Chrome installs. So not much of a dent, really. :)

      • [–]

        Phaedron

        Thursday, October 6, 2011 at 2:38 AM

        Not since last week’s judgement on ‘offending’ white aboriginal adopters, old son.
        Sarcasm was an integral part of the judge’s opinion regarding disallowed free expression.
        Be careful what you say. The country has now changed. :-|

  • [–]

    Anonymous

    Monday, October 3, 2011 at 2:44 PM

    Probably just a subtle dig at Google Botnet. ;)

  • [–]

    warcroft

    Monday, October 3, 2011 at 3:57 PM

    Deliberate or not, its still pretty funny.

  • [–]

    Steve

    Monday, October 3, 2011 at 4:23 PM

    MSE has caused problems since day one. I switched over from Avast, but the thing repeatedly crashed my PC and kept it hanging in the log-in screen.

    • [–]

      Ollie

      Tuesday, October 4, 2011 at 11:00 AM

      There’s absolutely nothing wrong with the actual MSE program… methinks maybe there is something else wrong with your computer. Like maybe something important is infected and MSE is quarantining it thus preventing your computer from running properly.

  • [–]

    anonymouse

    Monday, October 3, 2011 at 4:48 PM

    “Replace accidentally with repeatedly, and dog with son”

  • [–]

    Michael

    Monday, October 3, 2011 at 5:28 PM

    I thought the other conspiracy was inplay. A employee at Microsoft was saving the world from the spyware that is Chrome, and when Google learned about what MSE was doing, paid Microsoft $$$$ to fix it.

    Microsoft complied.

    What is the definition of spyware?
    What does Google want more of?
    What is the definition of spyware again?

  • [–]

    Steven Janjic

    Monday, October 3, 2011 at 6:26 PM

    I could believe this. Back when Chrome was in its early days (and family members were still using IE6) I tried to push Chrome onto them. My mother (who used to make a living designing websites) freaked out and uninstalled Chrome in less than a day. When I asked why, she said her antivirus software found a trojan as soon as she installed Chrome.

    I then proceeded to bang my head against a brick wall for several years (she finally came around recently)

  • [–]

    RobbyM

    Tuesday, October 4, 2011 at 5:23 PM

    Given how many people find Chrome and Safari installed onto their pc – via an update or install another piece of software which includes either browser, I’m happy to see anti-spyware/Anti-virus software removing them.

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