What is the Petya ransomware attack, and how can it be stopped?

[ahlam1399]

http://img-s-msn-com.akamaized.net/tenant/amp/entityid/BBDn5yu.img?h=100&w=100&m=6&q=60&o=f&l=fCompanies have been crippled by an attack dubbed ?Petya?, the second major ransomware crime in two months. Olivia Solon answers the key questions

أكثر... (http://www.msn.com/en-ca/news/world/what-is-the-petya-ransomware-attack-and-how-can-it-be-stopped/ar-BBDn3Lr?li=AAggv0m&srcref=rss)