"These activities show Mimail's primary purpose is for spam and fraud, " says Joe N.

FORBES: Technology

Some versions warned e-mail service firms that they would be attacked online if they disabled the accounts to which Mimail was sending data.

FORBES: Companies, People, Ideas

As the Sobig threat eased, a new profit-driven virus appeared:Mimail, which crashed machines and directly asked users to type in their credit card numbers.

FORBES: Criminal Outbreak

Mimail sent the data to e-mail addresses hosted in Russia.

FORBES: Criminal Outbreak