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Hot! Hackers have stolen usernames and passwords for nearly two million accounts at Facebook, Google, Twitter & Yahoo

Hackers have stolen usernames and passwords for nearly two million accounts at Facebook, Google, Twitter, Yahoo and others, according to a report released this week.

The massive data breach was a result of keylogging software maliciously installed on an untold number of computers around the world, researchers at cybersecurity firm Trustwave said. 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.

On Nov. 24, Trustwave researchers tracked that server, located in the Netherlands. They discovered 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
9,000 Odnoklassniki accounts (a Russian social network)
8,000 ADP accounts
8,000 LinkedIn accounts

Trustwave notified these companies of the breach. They posted their findings publicly on Tuesday.

“We don’t have evidence they logged into these accounts, but they probably did,” said John Miller, a security research manager at Trustwave.

Facebook, LinkedIn and Twitter told CNNMoney they have since reset passwords for all of its compromised users. Google declined to comment. Yahoo and ADP did not provide immediate responses.

Miller said the team doesn’t yet know 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’s impossible to track down which computers are infected.

Among the compromised data are 41,000 credentials used to connect to File Transfer Protocol (FTP, the standard network used when working from home) and 6,000 remote log-ins.

The hacking campaign started secretly collecting passwords on Oct. 21, and it might be ongoing: Although Trustwave discovered the Netherlands proxy server, Miller said there are several other similar servers they haven’t yet tracked down.

Want to know whether your computer is infected? Just searching programs and files won’t be enough, because the virus running in the background is hidden, Miller said. Your best bet is to update your antivirus software and download the latest patches for Internet browsers, Adobe (ADBE) and Java.

Of all the compromised services, Miller said he is most concerned with ADP. Those log-ins are typically used by payroll personnel who manage workers’ paychecks. Any information they can see can be viewed by hackers.

“They might be able to cut checks, modify people’s payments,” Miller speculated.

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