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Linus Tech Tips – My Channel Was Deleted Last Night

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Re: Linus Tech Tips – My Channel Was Deleted Last Night

#11

IMHO Pretty great of dbrand to step in and sponsor a topically sensitive video on short notice as well as provide a pretty big carrot to bring in a flood of traffic. Just ordered a matte black skin for my MBP 14". I have no relation to dbrand other than being an occasional customer.

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Re: Linus Tech Tips – My Channel Was Deleted Last Night

#12

IMHO Pretty great of dbrand to step in and sponsor a topically sensitive video on short notice as well as provide a pretty big carrot to bring in a flood of traffic. Just ordered a matte black skin for my MBP 14". I have no relation to dbrand other than being an occasional customer.

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There's a dbrand ad at the end of the video because they sponsored it and Linus made a big show of thanking them. It was enough to move me to buy something, I thought it was worthy of commenting to say its pretty cool what they did.

Re: Linus Tech Tips – My Channel Was Deleted Last Night

#14
post #6
post #2

TLDW: employee opens infected PDF from legit-looking email; session token stolen

How is this possible? Can someone point me in the direction of what mechanism is used here. If I open a pdf in chrome for example am I opening myself up to this kind of attack?

PDF can run JavaScript

Re: Linus Tech Tips – My Channel Was Deleted Last Night

#15
post #8
post #6

Earlier quoted context omitted.

How is this possible? Can someone point me in the direction of what mechanism is used here. If I open a pdf in chrome for example am I opening myself up to this kind of attack?

I would say first thing is to disable Windows Explorer from hiding the extension of files. From what I understand, it was an executable inside a zip attachment to an email disguising itself as a partnership proposal from a reputable source. The file inside the zip probably had a .pdf.exe extension. By default, Windows Explorer would show it as a .pdf, making it easy to run by mistake.

That should be stopped by the smartscreen prompt which is pretty hard to bypass by accident.

Re: Linus Tech Tips – My Channel Was Deleted Last Night

#17
post #7
post #5

Is there some kind of a sandboxed pdf viewer, that could prevent infected pdf access to the rest of the computer?

From what he describes, the file disguised itself a PDF but may have been an executable instead, so the PDF viewer was probably never launched. I blame Windows hiding the extension of known files by default. `anything.pdf.exe` would show as `anything.pdf` Can't blame people from thinking it's a PDF. Otherwise, I use SumatraPDF as a viewer. Small, no frills, probably less of a vulnerability target than Adobe Acrobat.

Still, they should've gotten warning prompts for running an untrusted exe when they opened it, wouldn't they? I mean I know people are pretty well conditioned to ignore those, especially gamer geeks who are used to using dubious tools.

Re: Linus Tech Tips – My Channel Was Deleted Last Night

#20
Couple of questions here on the virus side:

    Is there a link to the sample on VirusTotal?
Looking at how I can prevent this from happening to myself, am I missing something?

    Why didn't their email-service's anti-virus pick up on virus?
    In the case that it was in a zip, why didn't said anti-virus extract the zip & scan?
    In the case of a password-protected zip, why didn't the computer scan the file upon extraction?
    In the case of a scan upon extraction, why was it missed? Outdated definitions or zero day?
Linus also spoke about invalidating sessions. This is something that requires careful planning. We can't do it due to our teams switching VPNs so often.

We do enable Impossible Travel in Okta by default for our clients.

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