With regards to the second breach, named "X2", the New York Times had reported that the infiltration was discovered using United States Computer Emergency Readiness Team (US-CERT)'sĮinstein intrusion-detection program. The first breach, named "X1" by the Department of Homeland Security (DHS), was discovered Mawhen a third party notified DHS of data exfiltration from OPM's network. 2.1 Theft of security clearance information.In the aftermath of the event, Katherine Archuleta, the director of OPM, and the CIO, Donna Seymour, resigned. The first attack was discovered March 20, 2014, but the second attack was not discovered until April 15, 2015. It is unclear when the first attack occurred but the second attack happened on May 7, 2014, when attackers posed as an employee of KeyPoint Government Solutions, a subcontracting company. The data breach consisted of two separate, but linked, attacks. State-sponsored hackers working on behalf of the Chinese government carried out the attack. history, information that was obtained and exfiltrated in the breach included personally identifiable information such as Social Security numbers, as well as names, dates and places of birth, and addresses. One of the largest breaches of government data in U.S.
Approximately 22.1 million records were affected, including records related to government employees, other people who had undergone background checks, and their friends and family. In June 2015, the United States Office of Personnel Management (OPM) announced that it had been the target of a data breach targeting personnel records. Cyberattack stealing 20 million federal personnel records
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