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Latest Trojan 'Phishing' For Personal Data: Page 2 of 2

To defend against Mmdload and other malicious email attachments, Sophos recommends companies consider blocking all programs at the email gateway. For most businesses, it's rare for employees to receive a legitimate program from the outside via email.

"Best practice for business should include automatic blocking of all executable code at the email gateway," Belthoff said. "Reputable companies do not send out files in this way, and users should think twice before they click on unsolicited email messages."