That shows MalwareBytes detecting it as Trojan.Downloader.szb, and it does appear to be Zeus or a close variant. I'd be concerned.
> It is possible that a few thousand Windows users, who were using Opera between 01.00 and 01.36 UTC on June 19th, may automatically have received and installed the malicious software.
At least for me, Opera always asks for Administrator privileges before installing anything, so if you didn't happen to install updates in the timeframe given, you should be fine.
As someone who has Opera installed on their home machine, which they also use for banking, how worried should I be?
Would Malwarebytes be enough to find and remove the trojan?
EDIT: http://malwaretips.com/blogs/zeus-trojan-virus/