You're being warned not to click on an email that appears to be from WhatsApp. The fake message - which has the subject "missed voicemail" - spreads a dangerous virus.
Cybercrime experts are telling people not to click any links including buttons that say "New voicemessage" and "Play".
SET Ireland says "clicking on the link will begin the download of a trojan... that usually redirects the browser to a malicious URL or implements a specific exploit."
ESET Ireland recommends "extreme caution" when it comes to such emails, as trojan infections can expose the computer to ransomware, that ends up locking your files and demands a ransom of several hundred Euros.
They advise that "rather than impulsively clicking a link in an unverified email" log in to your WhatsApp account the standard way instead and check for any messages there.