Zeus, which was first detected in 2007 and has become one of the most damaging pieces of botnet
software in the world. Zeus originally stole passwords via Internet Explorer’s Password Store and if it
detected that the user was visiting a banking website, it would use keylogging techniques to discover
usernames and passwords. Zeus has hit computers at the Bank of America, NASA, and Amazon.
Because the Zeus uses malware to obtain sensitive information, it can also be classed as Spyware.
How many computers had Zeus infected by 2009?