Experts predict the U.S. will face what they call "an advanced persistent threat" from countries engaged in cyber-espionage.

McAfee says spies are using more targeted ways of infiltrating companies through email. The message appears to come from a close friend or colleague. But clicking on the attached link releases a worm that steals source codes and data. They call this "spear-phishing."

This story is part of Federal News Radio's daily Cybersecurity Update brought to you by Tripwire. For more cybersecurity news, click here.