Eastern European organized criminal group hacked a database server to steal payment card data and intellectual property using SQL injection and stolen credentials. They installed malware like packet sniffers and backdoors on the server to extract the data over time. The 2010 Data Breach Investigations Report from Verizon and the United States Secret Service analyzed hundreds of data breaches from the previous year and found hacking by external actors to be the most common cause, with malware and stolen credentials frequently used to compromise servers and steal confidential information.