Security experts say a spike in email scams linked to coronavirus is the worst they have seen in years.
Cyber-criminals are targeting individuals as well as industries, including aerospace, transport, manufacturing, hospitality, healthcare and insurance.
Phishing emails written in English, French, Italian, Japanese, and Turkish languages have been found.
The BBC has tracked five of the campaigns.
Researchers at the cyber-security firm Proofpoint first noticed a strange email being sent to customers in February. The message purported to be from a mysterious doctor claiming to have details about a vaccine being covered up by the Chinese and UK governments.
The firm says people who click on the attached document are taken to a spoof webpage designed to harvest login details. It says up to 200,000 of the emails are being sent at a time.