Hello,
I don't have a problem as much as a question about malware itself. I recently had a scan take place that identified a file as "Setup(1).Exe" in my downloads folder. The application quarantined it and I haven't seen anything since, but my concern isn't with that so as much as the nature of the cause of the infection itself. The previous evening, I had a scan take place at 7:07PM that was manual that yielded no results, and I went to bed a few hours afterwards. I did some basic internet browsing, though not to any sites I haven't been to in the past. The next morning, at 7:42 AM, the automatic scan discovered and quarantined the aforementioned "Setup(1).Exe" file in my downloads. I had a few theories as to why this may have happened:
Malwarebytes was updated and a files that previously may have appeared benign were newly flagged as malicious
The "Setup(1).Exe" file was not actually a setup file at all but rather the product of some malicious software or program that creates malware that ran overnight without my realizing
Though I have bluetooth disabled and have file sharing of every category disabled on my computer, some actor may have found some way to remotely download files to my computer without my consent
I apologize if any of these sound far-fetched, I simply want to make sure this doesn't happen again. I have already done a full system scan of every drive with the Malwarebytes Premium 4.4,10 application (including rootkits) and among 1,540,813 files, none raised a flag, and I had my computer entirely offline for the duration of the scan.
If you could offer any insight on why this could have happened and how to avoid a similar event from occurring in the future, I would greatly appreciate it. I am very paranoid about viruses and it's entirely possible I am simply missing something extremely simple. Thanks for indulging me.