The Storm Worm, malicious software spread via spam, has been so active in recent weeks that the FBI has even gotten involved. The agency posted an alert on the home page of its Web site Tuesday: “If you unexpectedly receive a Valentine’s Day e-card, be careful. It may not be from a secret admirer, but instead might contain the Storm Worm virus.”

ComputerWorld notes that security firms have been issuing the same warning for weeks, knowing that Storm has a tendency to take advantage of the holidays. The virus also appears to be optimized this year. So, stay smart and avoid joining the spam network.