Security researchers from Bitdefender Labs have spotted a new variant of the Dorkbot malware that targets Facebook users , spreading through the social network's internal chat.

Dorkbot is a IRC based worm that spreads via instant message programs, social networks that can steal login credentials and blocks security updates.

The malware has been uploaded with '.JPG' extension in file sharing website mediafire. Once the malware compromised the victim's system, it sent links to the malware to the victim's friends via chat service, according to Computer world report.

Researchers said the malware is capable of spying on users’ browsing activities and stealing their personal details.Bitdefender discovered links to the malware circulating in the United States, India, Portugal, the UK, Germany, Turkey and Romania.