On March 5, 2012, Hammond was arrested by FBI agents in the Bridgeport neighborhood of Chicago for his involvement in the December 2011 cyberattack on the servers of Stratfor, a private intelligence firm. The intrusion compromised 60,000 credit card numbers, $700,000 in fraudulent charges, and involved the download of 5 million emails, some of which were subsequently published by WikiLeaks. The indictment was unsealed the following day in the Manhattan federal district court. He was one of six individuals from the United States, England and Ireland indicted.