Make sure your antivirus definitions are updated as many vendors will have an update for this malware quickly.
Researchers at BitDefender have discovered a new type of malicious software that collects passwords for banking sites but targets only Firefox users.
The malware, which BitDefender dubbed “Trojan.PWS.ChromeInject.A” sits in Firefox’s add-ons folder, said Viorel Canja, the head of BitDefender’s lab. The malware runs when Firefox is started.
Firefox has been continually gaining market share against main competitor Internet Explorer since its debut four years ago, which may be one reason why malware authors are looking for new avenues to infect computers, Canja said.
Users could be infected with the Trojan either from a drive-by download, which can infect a PC by exploiting vulnerability in a browser, or by being duped into downloading it, Canja said.
When it runs on a PC, it registers itself in Firefox’s system files as “Greasemonkey,” a well-known collection of scripts that add extra functionality to Web pages rendered by Firefox.
BitDefender has updated its products to detect it, and other vendors will likely follow suit quickly, Canja said. Users could avoid it by only downloading signed, verified software, but that’s a measure that restricts the usability of a PC, he said.