Warning: Urgent Microsoft update may be Firefox malware

A phony anti-virus scam is presenting itself as a near-perfect Microsoft update popup with one notable exception - it appears only on machines using Firefox browsers.

According to the Sophos Naked Security blog machines infected in drive-by downloads from compromised sites receive the scareware that appears as urgent update notifications.

The clue that the updates are phony is that they appear only when the affected computer uses Firefox. Legitimate updates come via Internet Explorer, Sophos says.

Victims click to receive the urgent updates and their computers are infected with malware that seizes up the machines. A persistent popup says the infection can be cleaned up by buying anti-virus software - a phony product sold by the criminals behind the phony Microsoft update notification.

Sophos recommends accepting updates only from vendors from whom users have requested updates.

Read more about wide area network in Network World's Wide Area Network section.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags Microsoftsophosanti-malware

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.
Tim Greene

Tim Greene

Network World
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?