trojan windows defender

  1.    27 Oct 2017 #1

    trojan windows defender

    I change over to windows defender a few months ago and I just had my first fake trojan.
    I just go to very safe sites and got hit with the fake trojan, sorry, forgot to write any info down.
    I had seen it before on friends computers and cleaned it out, it wants you to call the number but all you have to do is disconnect from net and turn off computer, turn on computer and run ccleaner and defender, running mrt now.
    My question is how did it get passed defender, I know some web sites get a hidden infection and if you go there you could get infected but how did defender let it in, it may be new code in it but it is an old one, just turn off pc.
    I know antivirus just plays catch up before they can write code to stop something, still I am wondering why it got through.
    I am probably in the top ten percent for safe computing.
      My ComputerSystem Spec

  2.    27 Oct 2017 #2

    mrt has picked up 1 infection, still running
      My ComputerSystem Spec

  3.    27 Oct 2017 #3

    mrt said 1 infected file while running, when finished it said no malicious software found, under details none were listed, does that mean it took it out or should I run again. I might get a minor infection once every 2 years, I have had defender a few months and got one, just curious, I also read that defender will be improved in the fall update.
      My ComputerSystem Spec

  4.    27 Oct 2017 #4

    running mrt, it again says 1 file infected which confuses me, especially if when done it says none.
      My ComputerSystem Spec

  5. sml156's Avatar
    Posts : 672
    Microsoft Windows 10 Pro 64-bit
       28 Oct 2017 #5

    Check in your scan history, Maybe you have something in quarantine.

    To find your scan history open windows defender and click on the icon on the left that looks like a shield.
      My ComputerSystem Spec

  6.    29 Oct 2017 #6

    Usually disconnecting from the internet and running a Ccleaner scan on the browser does the trick for these things. But to be sure, you might want to run ADWCleaner and JRT.

    Downloads - AdwCleaner - ToolsLib

    Junkware Removal Tool Download

    I think Malwarebytes Pro would have prevented that from happening.
      My ComputerSystem Spec

  7.    29 Oct 2017 #7

    I've seen it before. It seems to only happen with Microsoft Edge. All you need to do when it pops up is CTRL-ALT-DEL and kill the Microsoft Edge process. It does not affect Firefox.
      My ComputerSystem Spec

  8. Posts : 21,732
    windows 10 professional version 1607 build 14393.969 64 bit
       30 Oct 2017 #8

    Each AV has its accuracy/inaccuracy.
    It takes into consideraton:
    false positives
    false negatives
    true positives
    true negatives
    AV-Comparatives Performance-Test - AV-Comparatives

    Potentially unwanted programs (PUPs) are categorized as malware.
    Some AV products automatically scan for them, others are manual, and other not at all.

    Malwarebytes has options to scan for:
    Potentially unwanted programs (PUPs)
    Potentially unwanted modifications (PUMs)
      My ComputerSystem Spec


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