A posting from Cnet News in there Security &  Privacy section:  Microsoft has issued a warning that a new piece of malware masquerading as a Google Chrome extension and Firefox add-on is making the rounds, threatening to hijack Facebook accounts. First detected in Brazil, Trojan:JS/Febipos.A attempts to keep itself updated, just like normal, legitimate browser extensions, Microsoft noted in a security bulletin late Friday.

Once downloaded, the Trojan monitors whether the infected computer is logged into a Facebook account and attempts to download a config file that will includes a list of commands for the browser extension. The malware can then perform a variety of Facebook actions, including liking a page, sharing, posting, joining a group, and chatting with the account holder’s friends.

Some variants of the malware include commands to post provocative messages written in Portuguese that contain links to other Facebook pages. The number of likes and shares on one such page grew while malware experts at Microsoft were analyzing the Trojan, suggesting that the infections are continuing to occur.

To read more click here: