Compromised Office 365 Accounts Used to Send 1.5 Million Email Threats in March

Microsoft Office 365 remains an attractive target for cybercriminals as it continues to be used by businesses worldwide. In a new report from Barracuda Networks, the company revealed that more than 1.5 million malicious and spam emails were sent from thousands of compromised Office 365 accounts of their customers in March 2019 alone. The increase in the number of account takeover attacks was said to be the cause for this massive total.

Credential harvesting behind account takeovers

The report details the various methods cybercriminals employ to take over Office 365 accounts. One of the most popular methods is the use of phishing emails that trick users into visiting impersonated Office 365 login forms. Once users log in, cybercriminals gain access to their email accounts. In 2018, the Trend Micro™ Cloud App Security™ solution detected 3.5 million attacks of this type.

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Source: Trend Micro