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Since a while I've been repeatedly interrupted by an alert window popping up to warn about a MigratorUIAgent not being able to start.
Clicking "Report" in the alert provided the following (redacted for brevity) information:

Process:               MigratorUIAgent [66602]
Path:                  /Library/Application Support/Avira/MigratorUIAgent.app/Contents/MacOS/MigratorUIAgent
Identifier:            MigratorUIAgent
Version:               ???
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           MigratorUIAgent [66602]
...
OS Version:            Mac OS X 10.11.6 (15G22010)
...
Dyld Error Message:
  Symbol not found: _kSecGuestAttributeAudit
...

So, it's from Avira and it's very likely an incompatibility with my aging OS version, introduced in a recent Avira update.
I found no information on Avira's site (nor anywhere else for that matter), where instead I found out I cannot report the issue to them because that is not allowed to users of the free version. Oh well, in any case I expected a "go buy yourself a new Mac" response.

Since I did not want to remove Avira entirely, I headed inside the app package contents and tentatively renamed MigratorUIAgent to MigratorUIAgent.BROKEN or something like that.

I did not expect it to work, but it did. No more alerts and the rest of Avira keeps working without a complaint. So far so good.

But what is this MigratorUIAgent?
From the name and the periodicity of the alert, I suppose it's the auto update agent.

Does anyone know more about this process?

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