More than one million records were stolen from banks, US government agencies and other websites by an affiliate of the Anonymous group known as the GhostShell Team. According to an analysis by Imperva, a global vendor of security solutions the breached databases succumbed to SQL injection attacks. Some of the breached databases each contained more than 30,000 records.
Read more here – http://blog.imperva.com/2012/08/analyzing-the-team-ghostshell-attacks.html