http://www.zdnet.com/blog/security/3-mi ... in;content
Summary: First, he warned of the security flaw in Iran’s banking system. Then he provided them with 1,000 bank account details. When they didn’t listen, he hacked 3 million accounts across at least 22 banks.
After finding a security vulnerability in Iran’s banking system, Khosrow Zarefarid wrote a formal report and sent it to the CEOs of all the affected banks across the country. When the banks ignored his findings, he hacked 3 million bank accounts, belonging to at least 22 different banks, to prove his point.
It does not appear as if Zarefarid stole money from the accounts; he merely dumped the account details of around 3 million individuals, including card numbers and PINs, on his blog: ircard.blogspot.ca. I found the link via his Facebook account, along with the question “Is your bank card between thease 3000000 cards?”