Microsoft Corp. said a Chinese hacking group is exploiting security vulnerabilities in the company’s SharePoint servers to deploy ransomware, following a cyberattack discovered last week that has affected hundreds of entities around the world. The group, which Microsoft has named Storm-2603, has a history of waging ransomware attacks, which use malicious software to lock down computers and render them inoperable. Ransomware groups usually then demand payment from their victims to unlock the computers.

Jennifer Ewbank, a veteran CIA operations officer who rose to become Deputy Director for Digital Innovation, now advises companies and clients on cyber resilience, digital transformation, and geopolitical risk through her company, Andaman Strategic Advisors. Jennifer examines today's pressing national security and tech issues, including the Microsoft SharePoint breach, with Tim Stenovec and Carol Massar on Bloomberg Businessweek Daily.