In an effort to infect large number of people, cybercriminals have developed a new malicious software program that contains functionality to spread itself quickly.
Geodo, a new version of the infamous Cridex (also known as Feodo or Bugat) banking information stealing Trojan works in conjunction with a worm that sends out emails automatically to continue its self-spreading infection method,
Source: New Cridex Banking Trojan variant Surfaces with Self-Spreading Functionality