I can attest to this as the downloaded file is indeed harboring the trojan. I have got a new laptop(3 days old), and was looking to replicate the setup I have in my other computer, so I proceeded to download and install BTSync(yesterday) and Kaspersky Internet Security(v13.0.1.4190) gave me a warning that BTSync.exe contains Trojan-Ransom.Win32.Foreign.diwl at "Program Files\Bittorrent Sync\BTSync.exe//UPX I uninstalled and performed a thorough scan and restarted. Scanned again, and the system was clean. When I tried to download the installer again, the AV gave me a warning that the installer has a trojan and I had to delete it. Is it possible that the virus signature has been added recently and that is causing alarms in the detection? I was searching for help on this and found no reports anywhere online about similar incidences. I was looking to write to the BT team when I chanced upon this thread, so had to add to this.