Security firm Sophos warns of fake Firefox ‘infected’ warnings

By on June 6, 2011
submit to reddit

New scareware campaign scare users into believing their PC is infected.

Press release:
IT security and control firm Sophos is warning people to be vigilant, following the discovery of an advanced ‘scareware’ campaign that presents users of Firefox with fake warnings that are designed to scare them into believing their computer is infected.

Mozilla Firefox users may see a genuine-looking ‘Firefox security alert’, which displays a convincing system scan, including a progress bar and the names of malware supposedly found in files on the victim’s machine – all lending to the credibility of the attack as a way to frighten computer users into parting with cash to clean up non-existent malware infections.

Scareware, or fake anti-virus attacks, prey on IT security fears and fool users into believing their computer has a problem when it does not.  Typically, scareware is planted on websites in the form of pop-up advertisements or disguised downloads. There have also been occasions when hackers have spammed out scareware, or links to it, using traditional social engineering tricks to fool users into clicking on the attachment or link.

“Taking advantage of detailed information about the person’s computer and software allows for a much more specific, believable social engineering attempt,” said Chester Wisniewski, senior security advisor at Sophos.  “We are likely to continue to see these criminals targeting each operating system, browser and any other details that can be gleaned from HTTP requests sent from our devices.”

For more information, including images, please visit the Sophos Naked Security site:

Graham Cluley, senior technology consultant at Sophos, is available for further comment on +44 (0)1235 544114 or +44 (0)7990 552181


Mufaddal Fakhruddin is the Editor for IGN ME and thinks writing in third person about himself in an about me section is weird.

Most Read
Most Commented
Win two Toshiba AT200 tablets

This festive season Toshiba has 2 tablets to giveaway.

Win an MSI FM2-A85XA-G65 Motherboard

Thanks to MSI we have an great AMD FM2 motherboard to giveaway.

Win a Nokia Asha 311

Thanks to Nokia we have a great entry-level smartphone to giveaway.