Stefan Mileschin

Hackers have managed to steal millions of Facebook, Google, Twitter, Yahoo data by installing key logging software on peoples' PCs.

Researchers at cybersecurity firm Trustwave said that the virus was capturing log-in credentials for key websites over the past month and sending those usernames and passwords to a server controlled by the hackers.

Last month Trustwave researchers tracked that server to Holland and they found compromised credentials for more than 93,000 websites, including:

318,000 Facebook accounts, 70,000 Gmail, Google+ and YouTube accounts, 60,000 Yahoo accounts, 22,000 Twitter accounts and 8,000 LinkedIn accounts were hacked.

Trustwave notified these companies of the breach. So far, there is no evidence that hackers have used the passwords.

John Miller, a security research manager at Trustwave, said that his team had not worked out how the virus got onto so many personal computers. The hackers set up the keylogging software to rout information through a proxy server, so it is impossible to track down which computers are infected.

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