Reply to post: I think I just found one of these

'Crazy bad' bug in Microsoft's Windows malware scanner can be used to install malware

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I think I just found one of these

I was looking at a Win 7 PC this morning that was exhibiting a lot of network activity but otherwise was hardly used - the user reported that it had been updating just fine and a regularly reported that it had been updated every week. But I completely failed to do a manual update and looking at the history the only thing that has been updated for a couple of months has been the Microsoft Security Essentials - at least that's what it "said" (MRD applies).

The machine had no mail access and very little browsing activity - I've just nuked it - factory reset with no restore.

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