A week before Christmas in 2013, a small Pittsburgh-based mechanical contractor gained notoriety as the source of one of the largest data breaches in history. Using a set of pilfered network credentials stolen from that contractor, criminals gained access to the global payment and billing network for retail giant Target. Once inside Target's network, the criminals utilized a sophisticated form of malware (i.e., malicious software) to identify and access approximately 40 million credit and debit card accounts.