A hacking group has been phishing the owners of popular Instagram accounts, extorting the victims, and then keeping them from recovering the stolen accounts, according to new research that underscores how attackers are exploiting the value of social-media brands. “We’ve seen cases where owners of Instagram profiles with followers between 15,000 and 70,000 were hacked and were never retrieved,” researchers from cybersecurity company Trend Micro wrote in a Thursday blog post.

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