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New Trojan sends spam to mobile phones

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An ingenious new Trojan is circulating that hijacks PCs and uses them to send SMS-based spam to mobile phones, PCWorld.com reports.

After a PC has been infected, the Delf-HA Trojan contacts a Web site for details on which spam campaign to run and then randomly generates a series of Russian mobile numbers beginning with the prefix +7921 or +7911. That many of the numbers will not have been allocated to customers is of no consequence as enough real ones can be targeted randomly.

The Trojan uses the "send e-mail" function of a number of Russian mobile network Web sites to actually deliver the mail sent from the infected machines.

Although Delf-HA targets only Russian mobile networks, experts have warned that the same technique could be used to send spam to subscribers of networks in other countries.