WASHINGTON – Despite repeated alerts, tens of thousands of Americans may still lose their Internet service Monday unless they do a quick check of their computers for malware that could have taken over their machines more than a year ago.

The warnings about the Internet problem have been splashed across Facebook and Google. Internet service providers have sent notices, and the FBI set up a special website.

According to the FBI, the number of computers that probably are infected is more than 277,000 worldwide, down from about 360,000 in April.

About 64,000 still-infected computers are probably in the United States.

People whose computers are still infected Monday will lose their ability to go online, and they will have to call their service providers for help deleting the malware and reconnecting to the Internet.

The problem began when international hackers ran an online advertising scam to take control of more than 570,000 infected computers around the world.

When the FBI went in to take down the hackers late last year, agents realized that if they turned off the malicious servers being used to control the computers, all the victims would lose their Internet service.

In a highly unusual move, the FBI set up a safety net. They brought in a private company to install two clean Internet servers to take over for the malicious servers so that people would not suddenly lose their Internet.

The temporary Internet system they set up, however, will be shut down at 12:01 a.m. EDT Monday.

Most victims don’t even know their computers have been infected, although the malicious software probably has slowed their online surfing and disabled their antivirus software, making their machines more vulnerable to other problems.

Both Facebook and Google created their own warning messages that showed up if someone using either site appeared to have an infected computer.

 

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