No April Fools'--Storm worm is back

New spam campaign takes advantage of April Fools' Day in an effort to to infect more computers to become part of the larger Storm worm botnet.

Robert Vamosi Former Editor
As CNET's former resident security expert, Robert Vamosi has been interviewed on the BBC, CNN, MSNBC, and other outlets to share his knowledge about the latest online threats and to offer advice on personal and corporate security.
Robert Vamosi
Jose Nazario, Arbor Networks

Don't click on that silly April Fools' Day e-mail, says one security expert.

In a blog, Arbor Networks' Jose Nazario reports that within the last 24 hours he's seeing new releases of the Storm worm designed to take advantage of the first day of April. This new spam campaign is a lure to infect new computers that will become part of the larger Storm worm botnet.

The e-mail body is spartan: the words "Doh! April Fools" followed by a numeric URL. If a user clicks on that URL, the default Internet browser will open to a page with a cartoon character. A download is supposed to start within five seconds and, according to the message, "If your download does not start, click here and then press 'Run.'"

The compromised computer will then install the downloaded file as C:\WINDOWS\aromis.exe. Nazario reports that the botnet file opens the firewall using the netsh firewall set command, makes a lot of outbound connections, then listens on a random UDP port.