RCA8R infection

It should be RCA8R, the R got missing while typing, I only saw this just now, sorry.

Hello Jo,

first of all, this isn't really a UTM question, is it? Are you using Sophos Endpoint (managed by UTM), or some other AV?

files [...] weren't usable
the extension instead of or in addition to the correct one (wonder if there weren't any conflicts in the former case)? But I doubt all files aren't all files on the machine - otherwise the OS would no longer work. Anyway, this alone wouldn't make the files unusable. It sounds like ransomware - normally there are ransom notes in the affected folders, and/or the extension is associated with something that displays such a note.
It should be possible to infer the original type of at least some files from their name, I assume they can't be opened though when the extension is reverted. 

a scan but without any result
"good" ransomware mops up after itself, thus usually the only detectable item would be the ransom note. Any detections for this machine recently?

Christian

Oh, sorry, I thought I was in the correct place. Apparantly not.

Indeed it sees to be ransomware. I'm afraid it's lost. Thanks for the info.

Jo, if you don't have endpoint protection on your PCs & servers, you should take a look at Intercept X Advanced on Sophos Central.  If you have another brand, your Sophos reseller will probably get a deal-you-can't-refuse from Sophos for you to switch to Central.

Cheers - Bob