Hackers attack Facebook's internal network


Facebook revealed on Saturday that its internal network was hacked last month.

The attackers were able to access the tech giant's computer network after employees visited a mobile developer's website which downloaded malware - software often used to steal information - onto employees' laptops.

"As soon as we discovered the presence of the malware, we remediated all infected machines, informed law enforcement, and began a significant investigation that continues to this day," the company wrote in a blog post. The staffers whose laptops were infected were found to be running up-to-date anti-virus software. But the attackers used what is known as a "zero-day" exploit, software that exploits previously unknown flaws in computer software, making it almost impossible for anti-virus software to detect.