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Why does dropboxupdatehelper.msi use mountvol.exe to mount the EFI System Partition on Windows?

Why does dropboxupdatehelper.msi use mountvol.exe to mount the EFI System Partition on Windows?

Seraph
New member | Level 2

I'm a security analyst trying to understand why dropboxupdatehelper.msi mounts the EFI System Partition.  I'm assuming that it does this by design - but I don't understand why.  The alternative is that I've got something pretending to be dropbox manipulating the EFI System Partition in my environment.  

 

Does anyone know why/if this might be done by the dropbox app on a Windows system?

 

Thank you for any clue you can provide!

3 Replies 3

Re: Why does dropboxupdatehelper.msi use mountvol.exe to mount the EFI System Partition on Windows?

Daphne
Dropboxer

Hey there @Seraph, thanks for reaching out to us here!

 

Just to make sure we're on the same page, would you mind sending me a few screenshots of what you're seeing there?

 

Also, which version of the app do you have installed at the moment?

 

Looking forward to hearing back from you!


Daphne
Community Moderator @ Dropbox
dropbox.com/support


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Re: Why does dropboxupdatehelper.msi use mountvol.exe to mount the EFI System Partition on Windows?

Seraph
New member | Level 2

Hi,

 

Thank you for your reply.  I expect this will be an easy question for one of your software engineers to answer.  To be clear, I'm just trying to understand what your software is doing here so I can sleep better at night knowing that this isn't a rogue process.  The end user is running the desktop client on a windows 10 device.  I expect that they are running the latest version - though that shouldn't matter for this question.

 

I'm attaching two images.  One shows that this file has been digitally signed by Dropbox - assuming the cert is authentic.  The other shows that mountvol is ultimately called to mount the EFI System Partition on the D drive.

 

Thank you again, I look forward to learning more about this.

 

image-of-mountvol-mounting EFI System Partition.pngimage-showing-dropboxupdatehelper-msi-signed.png

Re: Why does dropboxupdatehelper.msi use mountvol.exe to mount the EFI System Partition on Windows?

Jay
Dropboxer

Hi @Seraph, would it be possible to contact you at your email address to look into this matter further? Thanks!


Jay
Community Moderator @ Dropbox
dropbox.com/support


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