Images: Customized e-mail attacks

Two highly targeted e-mail attacks on individuals at corporations cropped up on Monday. In both cases, the e-mails contained malicious attachments that could lead to the recipient's system being taken over. MessageLabs security analyst Paul Wood said it is likely the two attacks are related, but their attachments and delivery mechanisms varied somewhat.

The first attack was sent to more than 400 individuals at financial institutions and claimed to be a U.S. Department of Justice complaint.