A technique of using Google Calendar invites and events as spam is gathering volume, according to researchers.

The mechanics are relatively simple: an attacker crafts an unsolicited calendar invitation carrying a link to a phishing URL, which is sent to the user's Gmail or G Suite address. By default, smartphone Gmail will automatically add events to the calendar and notify the user via a popup. If users click the link, they are taken to a phishing site or malware is downloaded directly. As the popups appear to originate from the trusted Google Calendar app, users are much more likely to interact with them, and Gmail spam filters are sidestepped by the association too.

"Cybercriminals send targets an unsolicited calendar invitation carrying a link to a phishing URL," explained Kaspersky researcher Maria Vergelis, in a recent blog post. "A pop-up notification of the invitation appears on the smartphone's screen, and the recipient is encouraged to click on the link. The website where they are directed then tells victims to enter their credit card details and add some personal information, which is sent straight to the scammers."

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