Trustwave researchers say that approximately two millions accounts at Facebook, Twitter, Google, and others have been hacked in recent weeks.
The research report indicates that passwords were compromised in the attack, which is being called “massive” in nature.
According to CNN, the massive data breach was a result of keylogging software maliciously installed on an untold number of computers around the world.
The virus deployed in the attack captured log-in credentials for the aforementioned websites over the past month. The maliciously obtained usernames and passwords were then directed to another server controlled by the hackers behind this security breech.
The server, located in the Netherlands, was found to contain compromised credentials for more than 93,000 websites, including the most popular social media sites in the world.
“We don’t have evidence they logged into these accounts, but they probably did,” said John Miller, a security research manager at Trustwave.