Banking trojans infect people’s web browsers as drive-by downloads and take over their bank accounts, performing transactions without the user knowing, Jerome Segura, senior researcher at security software maker Malwarebytes, told me in an email. Mass infections from email attachments and drive-by downloads are also turning computers into nodes in botnets—tens of thousands of machines commandeered for jobs like churning out spam email or launching distributed denial of service attacks on websites.
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