Researchers are warning users to be on the lookout for form-based phishing attacks whereby scammers abuse or imitate branded file-sharing, content-sharing and productivity websites in order to trick users into giving up their credentials or their account access.

In a blog post on Thursday, Barracuda Networks says that from January through April 2020, these form-based attacks most often impersonated Google and Microsoft services, and comprised four percent of all spear phishing attacks -- with 24,508 such incidents taking place in April alone.

Cybercriminals leveraged branded Google file sharing and storage websites (e.g. and 65 percent of the time, and Microsoft (e.g., and 13 percent of the time. Other impersonated site brands included, and (2%) and more.

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