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Notepad++ updater installed malware
(www.heise.de)
This is a most excellent place for technology news and articles.
This isn't the first time Notepad++ was compromised. if I recall correctly, the first time was by a CIA backdoor.
https://notepad-plus-plus.org/news/v733-fix-cia-hacking-npp-issue/
That doesn't really have anything to do with notepad++ in particular though. I don't think it's typical for programs to be running checks on the integrity of dll files.