I number of known compromised accounts are showing "FailedLogonDescriptionSourceAccountUnknownUser" login activity against a domain controller, see attached pic.
Can anyone explain what this means?
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It's a bug. The system tries to find a resource string in the currently set language and failed to find it.
I opened a bug for it.
Thanks for reporting it!
Also, I am guessing that the string that was planned behind this key is probably saying we saw a failed authentication from an unknown user.
Thanks Eli, interesting to know!
If you need anything from me with regards to this please let me know.