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May 172017
 

It may not be very funny, but the funny thing about WannaCrypt is that it is somewhat of a failure! Unless the authors are spectacularly stupid (not entirely impossible incidentally), they have no way to recover their ill-gotten gains. The pile of looted bitcoins they have acquired is fully visible, so any attempt to use those coins will almost certainly result in them being tracked down – they have attracted too much attention.

Which is another aspect of the WannCrypt malware – it has highlighted the vulnerability (MS17-010) and caused a huge vulnerability hunt. Which is causing those who wrote other malware (such as Adylkuzz) to gnash their teeth, because otherwise their malware would have quietly worked away in the background. The malware authors behind Adylkuzz have probably made more money than the WannaCrypt malware authors … and may well get away with their loot too.

Which is why other malware authors “wannacry” – the attention that WannaCrypt has gotten has ruined MS17-010 for them.

May 172017
 

It seems rather strange when you discover it, but Windows Update sometimes lies about what updates have been installed. I am not sure how often this happens, but it does happen from time to time. Which with WannaCrypt rampaging around is somewhat unfortunate.

What seems to happen is that Windows Update gets confused about what patches it has installed – it’s internal database gets corrupt. One possible fix for this is to remove the database :-

net stop wuauserv
cd %systemroot%
ren SoftwareDistribution SoftwareDistribution.old
net start wuauserv
rd /s/q SoftwareDistribution.old

When using Windows 10, you may well have to start (net start wuauserv) Windows Update services before stopping them. Once you have removed the directory, the next time you run Windows Update in the gooey, it will spend some time rebuilding it’s database and hopefully will then pick up the missing updates. No promises but this worked on at least one server that had unacknowledged missing patches.

Of course without a proper vulnerability scanner it may be tricky to determine when Windows is lying about being fully patched. The best bet is to assume it is lying whenever something like WannaCrypt comes along.

The other possibility is to look into something like Autopatcher which is intended for offline updates – you can download the Microsoft updates and use the tool to patch Windows computers from the downloads.

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