Researchers have uncovered a new variant of the infamous Zeus Trojan. It’s called Chthonic, a reference to spirits and deities from the underworld in Greek mythology, and it’s targeting 150 banks and 20 payment systems in 15 countries.

Zeus, as its name suggests, is the king of banking malware. It first emerged in 2007 and has been wreaking havoc on online bank accounts ever since. In 2011, its developers threw in the towel and posted its source code for all to see. It may seem as though this would be the end for Zeus, but, in fact, the opposite is true.