6. RSA Security

Date: March 17 2011

Impact: 40 thousand employee information stolen

An anonymous phishing mail called 2011 Recruitment Plan was sent to many employees. The mail breached the adobe flash player of the PC and installed a Trojan called Poison Ivy Rat that gave the remote access of the PC to the hackers.

5. TJX Inc.

Date: December 2006

Impact: 94 million credit cards exposed

The company did not have any firewall installed in the network. This allowed the hackers to steal about hundred million credit card details by toying with an in store kiosk that lets the users apply for jobs.