Concerned I may have accidentally downloaded Malware (or worse)

Hi all,

In short about once every 4 years I will do something dumb and I think today may be one of those days. I am working from home and using my aging 2012 iMac. In short using the work GMail (I don't have to log onto work servers to access it - so they have no exposure) I got sent what looked like a genuine e-mail, viewed the attachment from GMail (did not download it so I expect it may be in my cache somewhere if it did do something as it had to view somewhere - appears to have been a zip containing an excel file; it didn't open in Excel) - before realising this looked wrong and deleted it. It appears a third party work contact was the one compromised.

I am in the process of running a VirusBarrier check (by Intego) and also an old copy of Clam XAV. Both are running slowly but are so far showing nothing.

I also run an aging copy of Etre check that flagged a few things (output below) - it mostly seemed to be poor performance (but this has been an issue for a while where it is getting old and getting heavy daily use) - have added this in as an edit/reply.

In short nothing weird is going on (yet) but I just want to check I haven't got anything weird going on in the background that I should be aware of (e.g. malware that's installed itself somewhere).

Is there any way of me checking this more thoroughly and making completely certain everything is still OK?

Re: the Internet itself I am running Firefox with No Script enabled and UBlock Origin as well - but where I am thinking that I viewed the attachment within GMail there may be a slight hint of risk.

Thanks in advance for any advice or suggestions (and apologies for the less than ideal Etrecheck formatting).