In an age when new cyber threats crop up constantly and existing malware variants are hatched every day, CISOs have a lot of ground to cover. Yet older threats don’t necessarily go the way of the dinosaur. As Check Point recently reported, the Conficker worm and Zeus trojan–both more than five years old–still rank among the top 10 most common malware globally.

As a result, CISOs need to be up on emerging threats and the latest technologies and threat vectors, for sure. But they also need historic context and situational awareness.

In this article, CSO Online highlights four of the worst malware threats that still have some life despite their age–Conficker, CryptoLocker, Zeus, and Duqu–and provide a quick study of what they’re about.

Read the full story here.