Is avast! be safe from Tox Ransomeware?Look at mcafee blog about this: https://blogs.mcafee.com/mcafee-labs/meet-tox-ransomware-for-the-rest-of-us :-\ :o
No idea as the malware changes daily, I am currently working on a McAfee system that got hit by this http://www.geekstogo.com/forum/topic/352846-possible-trojan-infection-superantispyware/#entry2505431 so you do need additional controls in place like cryptoprevent and a decent back up strategy