In the past month I noticed ads inside Viber desktop (it's used a lot here, instead of WhatsApp)
Later I got a call from a friend that his windows defender picked up a trojan in Viber files.. Next day I got it too.
I shit you not, they let out an update with malware, on a popular chat app. I uninstalled and got the next update, with blind trust, I can't migrate atm...