Definitely harmful software. I specifically denied permissions to access my contacts during the installation, and yet the Viber spammed all my contacts that I've installed Viber. 1. I didn't allow it to access my contacts. 2. Why would a software send anything to my contacts without even notifying me about it? I'm not even talking about asking for my consent. Sure thing I'm uninstalling it. Hope Viber will send notification about that as well. It's not normal for software to do such things.