http://www.networkworld.com/news/201...my-250956.html

A mammoth army of infected computers is being assembled, but it's unclear
yet what purpose they will be put to.

Wave after wave of malicious email attachments has been sent out since
August, and with average success rates for such mailings, millions of
machines could be compromised, says Internet security firm Commtouch.

Once infected, the computers can be loaded with additional malware that
can perform a range of activities, including spamming, participating in
DDoS attacks, stealing bank credentials and compromising email and social-
network accounts, according to an upcoming Commtouch blog post.