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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Haifei Li‏ @HaifeiLi 28 Dec 2017
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      I’m fresh installing a Windows 10 OS, I will report what default apps Microsoft pushes to me.

      1 reply 1 retweet 7 likes
      Show this thread
    2. SwiftOnSecurity‏ @SwiftOnSecurity 30 Dec 2017
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      Replying to @wdormann @Jon_Torbitt and

      Microsoft removed the ability to opt-out of junk apps from Home and Pro editions of Windows 10 after RS2.

      10 replies 21 retweets 71 likes
    3. Will Dormann‏ @wdormann 30 Dec 2017
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      Replying to @SwiftOnSecurity @Jon_Torbitt and

      One way to block foistware installation on Windows 10 that actually seems to work is to create and activate an AppLocker rule to block http://Microsoft.Windows .ContentDeliveryManager. But this is obviously no good with Win10 Home users. Anybody have a better strategy that works?pic.twitter.com/Cct3bF75ms

      2 replies 4 retweets 8 likes
    4. Vadim Sterkin‏ @vsterkin 1 Jan 2018
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      Replying to @wdormann @SwiftOnSecurity and

      How do you enforce AppLocker on Pro? It's Enterprise onlyhttps://docs.microsoft.com/en-us/windows/device-security/applocker/requirements-to-use-applocker …

      3 replies 0 retweets 0 likes
    5. Will Dormann‏ @wdormann 1 Jan 2018
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      Replying to @vsterkin @SwiftOnSecurity and

      Apparently it isn't. As you can see from the screenshot, Win10 Pro had no problem configuring and enforcing the AppLocker policy, which was created using the standard GUI method. No trickery involved.

      2 replies 0 retweets 0 likes
    6. Vadim Sterkin‏ @vsterkin 1 Jan 2018
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      Replying to @wdormann @SwiftOnSecurity and

      Not like I don't believe you, but this is not apparent based on these screenshots. Do you have the corresponding entries in the event log under Application and Services - Microsoft - Windows - Applocker? Do 'Deny' Executable Rules work as well and have event logs?

      1 reply 0 retweets 0 likes
      Will Dormann‏ @wdormann 1 Jan 2018
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      Replying to @vsterkin @SwiftOnSecurity and

      Well this is quite interesting. Event viewer indicates that AppLocker isn't available on this SKU. But: 1. Why does Win10 Pro allow for AppLocker rules to be created if it doesn't enforce them? 2. Why does the machine have no foistware if it doesn't enforce the rules I created?pic.twitter.com/WXpAkEbCtc

      11:49 AM - 1 Jan 2018
      • 1 Like
      • stealthtaco
      4 replies 0 retweets 1 like
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        2. Will Dormann‏ @wdormann 2 Jan 2018
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          Replying to @wdormann @vsterkin and

          A day and a reboot later, this VM is still free of foistware. So far this is the ONLY technique I've seen so far that successfully appears to block the junk appearing on a Win10 Pro system. Now, given that the Pro SKU doesn't appear to actually enforce AppLocker... ¯\_(ツ)_/¯pic.twitter.com/agV9yx3vGv

          1 reply 0 retweets 1 like
        3. Kevin Beaumont‏Verified account @GossiTheDog 2 Jan 2018
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          Replying to @wdormann @vsterkin and

          Have you tried booting a blank Win2010 VM with no changes since? Maybe MS fixed something.

          1 reply 0 retweets 0 likes
        4. 6 more replies
        1. Will Dormann‏ @wdormann 1 Jan 2018
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          Replying to @wdormann @vsterkin and

          Perhaps the foistware is still coming on the VM in question. I guess I'll leave it running and wait and see... If the apps still come, that puts us right where we started: No known way to block Windows 10 foistware on non-enterprise SKUs.

          0 replies 0 retweets 0 likes
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        1. Kevin Beaumont‏Verified account @GossiTheDog 1 Jan 2018
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          Replying to @wdormann @vsterkin and

          Yeah in Win7 it is the same, it lets you create rules on any version but only enforced in certain releases. Not sure re Win10. It may be other changes are stopping. If it stops it should log in Event Log.

          0 replies 0 retweets 0 likes
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        1. Vadim Sterkin‏ @vsterkin 1 Jan 2018
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          Replying to @wdormann @SwiftOnSecurity and

          1. For confusion purposes:) This enables you to configure rules and export them, that's all. Executable or script rules are good sanity check. 2. Delivery might be delayed or something else is preventing install.

          0 replies 0 retweets 0 likes
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