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A program that can secretly change your dialup connection setting so that instead of calling your local internet provider, your PC calls are routed to an expensive 0900 or international phone number.
Carlson Dialer is known to be installed by IM worms particularly related to the MSN chat client. Once it is on the victim's PC, it will make long distance calls depending on your geographic position. If the machine infected with this dialer is part of a larger network, the dialer will attempt to write itself to the domain server.