Cyber chaos is spreading following this weekend's worldwide ransomware attack.
Hackers are demanding money to unlock important files. The extortion scheme has affected computers in 150 countries and could cause even more problems as malicious variations appear.
The virus known as "Wanna Cry" paralyzed computers running Britain's hospital network and Germany's national railway as well as scores of companies and government agencies around the world.
Anupam Josh is the Director of UMBC's Center for Cybsecurity. He joined ABC's In Focus to discuss the virus and what you can do to protect your computer.