The FBI is warning users of popular email services such as Outlook and Gmail that they could be subject to cyberattacks by ransomware called Medusa, which has impacted more than 300 victims from a number of sectors, including technology, legal, medical and manufacturing.

Medusa, a ransomware-as-a-service that was first identified in June, was spotted as recently last month, according to an advisory released last week by the FBI, the Cybersecurity and Infrastructure Security Agency (CISA) and the Multi-State Information Sharing and Analysis Center (MS-ISAC).

“Both Medusa developers and affiliates—referred to as 'Medusa actors' in this advisory—employ a double extortion model, where........

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