A new Trojan horse is spreading over the internet by posing as a software extension for the open source Firefox browser.
Internet security software company McAfee says the FormSpy Trojan attacks computers that have already been infected with the Downloader-AXM Trojan.
Once FormSpy is executed it installs itself as a component of the Firefox browser, which currently has around 11% of the browser market.
When installed, the FormSpy spyware gleans sensitive information, such as credit card and on-line bank account details, and forwards them to a remote server where they can be used by fraudsters.
The Trojan can also be used to sniff passwords in e-mail and instant messaging traffic, again, then forwarding this information to a remote server.
If users have installed protection against the Downloader-AXM Trojan, they can’t be infected with FormSpy, said McAfee.
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