Trend Micro was the target of an insider threat that saw about 100,000 of its consumer customers have their account information stolen, sold and used to make scam phone calls.

Less than one percent of Trend Micro’s 12 million consumer customers were compromised when an employee improperly accessed their data and then sold it to an as-yet-unknown third party. The data involved included customer support database that contained names, email addresses, Trend Micro support ticket numbers, and in some instances telephone numbers.

The cybersecurity company said in a statement today the first inkling something was wrong came in August 2019 when some customers complained of receiving scam phone calls from people purportedly from Trend Micro. The information the callers disclosed to their targets during the conversations led the company to believe it had to have come from an insider.

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