Trojan.FBSpammer is Malwarebytes’ detection name for a family of Firefox extensions that are designed to spam Facebook groups.
Users of affected systems may notice a Firefox extension that is called Page Update and the corresponding .xpi file has a random name consisting of capital characters and underscores.
Users may also notice posts made on their behalf on Facebook groups they did not join themselves.
Trojan.FBSpammer is a Firefox extension that joins multiple Facebook groups and starts posting in them on behalf on the victim.
Trojan.FBSpammer is installed from websites that offer it as a Flash update.
Both the Web protection module and the Malwarebytes browser extension block the websites pushing this malicious extension.
Malwarebytes can detect and remove Trojan.FBspammer without further user interaction.
Extension name examples: