The emails, apparently from a 'David Adams' at F-Secure, tell the recipient that they are having problems with their browser, and include a screenshot in a .zip file.
But the file contains a new worm variant called Breplibot.AE which installs a backdoor to allow remote control of the PC. It also attempts to shut down any security software running on the machine.
The email reads: 'I noticed whilst browsing your site that there were problems with some of your links, when I tried again with Internet Explorer the problems were not there so I assume that they were caused by me using the Mozilla browser.
'As more people are turning to alternative browsers now it may be of help for you to know this. I have enclosed a screen capture of the problem so your team can get it fixed if you deem it an issue.'
F-Secure has confirmed that it has no employee by the name 'David Adams' and does not distribute emails with attachments to its customers in this way.
"There is a mass spamming underway right now. Some emails were also spoofed from [email protected] or from [email protected]," said Mikko Hyppönen, chief research officer at F-Secure on the company's blog.
"The emails are not sent from our network. They are just spoofed to look like they are coming from an F-Secure address."
Molybdenum ditelluride is a two-dimensional material that can be easily stacked into multiple layers to create a memory cell
New light-guiding nanoscale device can control and monitor a nanoparticle trapped in a laser beam with high sensitivity
Optical traps are scientific instruments in which a focused laser beam is used to exert an attractive or repulsive force on a microscopic object to hold it in place
Scientists estimate that the exoplanet has already lost up to 35 per cent of its mass over its lifetime
The observations were made using the Atacama Array in the Chilean desert