[Blink]

Do we know exactly what type of malware it is?

After reading into it more (seeing what VT actually reports), it seems be a shady installer; thus, botg was not entirely incorrect. It appears to use InstallCore, or FusionCore for the installation, you can read up on that here: https://www.microsoft.com/en-us/wdsi/thr...nstallCore

Therefore, FileZilla would not be considered straight malware, but simply riskware, as it uses an installer that distributes adware and has a low reputation. I'll update the original post with this information. However, even with this information, I would recommend that you avoid using it, and use an alternative instead.