Security researchers responded Monday to news of the REvil ransomware attack on computer and electronics manufacturer Acer late last week, mostly expressing shock over the $50 million price tag and advising the computer maker not to pay. Oliver Tavakoli, our CTO, said it’s expected that the recently disclosed Microsoft Exchange Server vulnerabilities, collectively known as ProxyLogon, will continue be leveraged by a number of actors with varying objectives over the coming weeks and months.