"In its first big strike against technical support scamming companies, Microsoft's Digital Crimes Unit (DCU) filed a civil lawsuit in federal court in the central district of California against Omnitech Support and related entities for unfair and deceptive business practices and trademark infringement," a Microsoft spokesperson said.

One of the companies named in the case filed recently is C-Cubed Solutions Private Limited, which the court papers said is "a private business company formed under the laws of India" that operates the mail server through which "fraudulent technical support businesses communicate with customers".

Microsoft's suit said that 3.3 million Americans fall victim to technical support scams every year and lose USD 1.5 billion. Describing the fraud, senior Microsoft attorney Courtney Gregoire wrote in a company blog, "These scammers claim to find non-existent computer viruses and infections then con people out of their hard-earned money for bogus tech support, in addition to stealing personal and financial information or even installing new malicious software." Microsoft has received over 65,000 complaints about such scams since May, she wrote.

The court papers specifically mention alleged frauds using web sites and phone numbers from the sites leading to scammers that Microsoft said it had investigated. Many people in US have reported receiving telephone calls -  in several instances from persons speaking with an Indian accent and using Indian names - claiming to be from Microsoft or a related organisations and saying a problem has been discovered in their computer.

In a typical call a person identifying himself as "Raj" from Microsoft called from a number with a Washington, DC, telephone area code and claimed that the company had identified a problem with the computer. Asked in one instance how he knew about the problem and if he had hacked the computer, "Raj" said he had. When he was told that hacking was a crime, he hung up.

Unwary computer users who take the bait are asked to visit a web site or to download a program, which will introduce a malware that can collect information like logons and financial data or be used to spread the malware. The information collected can be used for identity theft. In other cases, they ask for remote access to the computer and demand credit card numbers to collect their fees.

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