I hope your happy with MSE until it doesn’t detect something as there isn’t a single security application that will give 100% protection.
I also hope you get the kind of support that you have got from these forums in the past.
Presumably you have confirmed that detection at VirusTotal.
This detection is in an old backup zip file, which is inert until you extract the file/s in side and try and run any executable at that point the file system shield would scan it. So there was no active password stealer (if the detection is correct) running on your system.
Archive files aren’t scanned by default (see image1) for that very reason they are inert, so unless you did a custom scan and opted to scan all packers (image2) avast wouldn’t have been scanning, so you would never know if avast would have detected it or not if you hadn’t specifically scanned it.
This .zip is Windows Backup. Vista’s backups on every sunday. So, it has been in my computer previously.
Avast must have been without detect it, because otherwise it would not have come to weekly autobackup. But MSE not found anything on Windows C://. Backup D:// has only this stealer on backup .zip…
But I get all the services normally with my passwords and i use most of this services LastPass, so there no need to manually write passwords.
Which is why it is best not to rush to judgement and fully investigate before deletion, once the nuclear button has been pressed there is no going back.
I have my doubts if it is lastpass (never used it) as surely that would show up in other such backup zips. You have to read deeper into the path displayed to see where this detection is found in the zip file and that appears to be in a firefox cache. So I don’t believe lastpass would be saving stuff within the firefox cache.