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India tops list of spam e-mail spewers

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"While the spam originates from a location in India, it's very difficult to find where the actual fingers on the keyboard are," said Shantanu Ghosh, Symantec's managing director in India.

A host of companies in India handles "digital marketing" for local and foreign clients, using unsolicited e-mails to target website and cellphone users. At Brainpulse Technologies' bare-bones offices outside Delhi, dozens of twentysomethings at cheap wooden desks in dented cubicles design Web pages and mass marketing campaigns for foreign clients. A company selling point: Our unsolicited bulk mail campaigns are well crafted, allowing them to sneak past most e-mail filters.

"If the e-mails reach your inbox, it's e-mail marketing; if not, it ends up in your spam folder," said Vishwajeet Bhattcharya, the company's senior business development manager. "I don't know spammers. We work legally."

Although most spam these days comes from zombie computers in Asia and Latin America, its preferred targets are users in the U.S. and Europe, where incomes are relatively high and credit card use widespread.

Once an Indian computer is corrupted, it may be linked with hundreds, even thousands, of bots in what is known as a "botnet," controlled by a "bot herder." Botnets can be exploited directly. Alternately, they can be leased or sold to scammers who use the zombie computers to spew junk mail, which includes relatively benign ads for fake designer bags and Rolex watches, hoaxes, financial scams and identity theft and "phishing" emails that solicit bank or credit card details.

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The cost of leasing a network of 100 bots capable of generating 500 to 1,000 e-mails per minute is about $2,000 a month. Buying a few hundred might cost $1 apiece, the Moscow-based Internet security firm Kaspersky Lab said, noting that a botnet with 100,000 zombie computers sold a few years ago for $36,000.

Although malicious e-mails account for only 4 percent to 5 percent of spam, their numbers are growing exponentially because they're so profitable.

"Spam is becoming increasingly malicious," said Graham Cluley, Sophos' senior technology consultant. "They recognize that the best way to monetize isn't necessarily by offering fake Viagra or false degrees."

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