[Emerging-Sigs] JA3 flags official Firefox distribution sites as malware

Jason Williams jwilliams at emergingthreats.net
Tue Oct 29 00:19:30 HDT 2019

Thank you!

On Mon, Oct 28, 2019 at 7:56 PM Michał Purzyński <michalpurzynski1 at gmail.com>

> Be careful what you wish for ;)
> I just spent over an hour submitting falses while also correlating each
> JA3 and JA3S with additional domains (from my Zeek's data) that rules
> either were or will be falsing on. I have more examples, but I have no time
> - and I already spent several hours on sorting through this today.
> You're gonna see pretty much entire public side of the Firefox delivery
> infrastructure and half of Microsoft. Maybe that's BITS matching, of
> Microsoft's CryptoAPI, or both, or more.
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