PLEASE READ Advisory: Kernel memory issue affecting multiple OS (aka F**CKWIT, KAISER, KPTI, Meltdown & Spectre) for the latest updates.
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Here’s an article from the KB on blocking web browser mining:
Basically, Sophos classifies web based crypto mining under the “Hacking” web category which you can add to a Web Policy. I’m not 100% sure if CryptoJacker is listed under this category yet but it should be if Sophos is aware of it.