If you work in finance or accounting and receive an email from your boss asking you to transfer some funds to an external account, you might want to think twice.

That’s because so-called “whaling” attacks — a refined kind of phishing in which hackers use spoofed or similar-sounding domain names to make it look like the emails they send are from your CFO or CEO — are on the rise, according to security firm Mimecast.

In fact, 55 percent of the 442 IT professionals Mimecast surveyed this month said their organizations have seen an increase in the volume of whaling attacks over the last three months, the firm reported on Wednesday.

Those organizations spanned the U.S., U.K., South Africa and Australia.

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