Superfish adware made its claim to fame through a class action lawsuit filed against Lenovo, the largest maker of PCs in the world. Superfish spyware came pre-installed on Lenovo machines without Lenovo customers being told of its existence. Superfish installed its own root certificate authority which allowed it to void SSL/TLS connections, creating an opening or hole for attackers. This exposed Lenovo users to potential cyber criminals while providing Superfish and Lenovo with a way to target unsuspecting users with tailored advertisements.