Microsoft is warning that the BazarCall (or Bazacall) call center malware operation is actually more dangerous than first thought, with initial attacks potentially leading to ransomware attacks within 48 hours. The group had been targeting Office 365/Microsoft 365 customers with phishing email regarding 'expiring' bogus trial subscriptions that dupe the target into calling a call center to chat with an operator, who then try to trick the victim into installing the Bazacall backdoor. .

Link: This unusual malware attack can go from first contact to launching ransomware in just 48 hours
via http://www.zdnet.com