Why SOSDataSource-ak in keychain?

I'm seeing the same entries on the KeyChain. I was cheking all entries since I was looking at this thread about some other strange entries.

strange entries in keychain, under an account called "waldo"

It will be nice if instead of contacting Apple Support, some actual interest in the matter is shown from this department, as some users are wondering if this is actually malicious activity, and it seems impossible to find any useful documentation about it.

Not sure what it is, but I have five items in my iCloud keychain, all called SOSDataSource-ak, and all were created today. It occurred immediately after joining a new WiFi network, alongside an airport network password item. This has not happened to me before, and the only thing I can think of is that I have recently upgraded to High Sierra (most recently 10.13.2). All of these items are in an access group for "com.apple.security.sos".

I had the same question and contacted Apple Support. They confirmed that the item is part of the software for the keychain function. It is part of your system and is not an issue at all.

Hello!

Not only that I have it too, but also on my SMTP list inside mail, I have a long list of old SMTP servers that are impossible to delete.

If I delete de "SOSDataSource-ak" the list is also gone, but after few seconds I got it back in my Keychain and the list reappears…

did you ever find what (SOSDataSource-ak) is.

I'm seeing it in keychain also.

Where are you seeing this? Perhaps reach out to Apple Support -- Contact - Official Apple Support.