Denver Public Schools

Summary

A cybersecurity incident at Denver Public Schools involved unauthorized access to computer servers, compromising personal data of all district employees. The breach exposed sensitive information including Social Security numbers, bank account details, fingerprints, driver's license and passport numbers, and student identification data. While employee records were affected, there was no evidence of student information being accessed. The district notified impacted individuals, established a dedicated call center, and provided credit monitoring and identity theft protection services. Subsequent security enhancements were implemented alongside ongoing employee data protection training to prevent future incidents.

Motives

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TTPs

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Description

The Denver Public Schools (DPS) experienced a cybersecurity incident involving unauthorized access to its computer servers between December 13, 2022, and January 13, 2023. The district discovered on January 4, 2023, that an unauthorized actor had accessed and exfiltrated certain files containing sensitive personal information. The compromised data included Social Security numbers, bank account numbers, fingerprints, driver's license numbers, passport numbers, and student identification numbers belonging to current and former participants in the district's health plan. All 15,000 DPS employees were affected by this breach, making it a district-wide compromise of employee records. The accessed files contained multiple categories of personally identifiable information, though officials stated there was no evidence that student data had been compromised during the intrusion. The breach window spanned approximately one month before detection, with the district confirming the data theft nearly two months prior to its March 3, 2023 public disclosure.

DPS initiated response measures by mailing notification letters to all affected employees and establishing a dedicated call center (855-951-4287) to address inquiries related to the breach. The district offered complimentary credit monitoring and identity theft protection services to mitigate potential financial harm to impacted individuals. Administrators implemented additional network security enhancements following the incident, though specific technical controls were not detailed in public statements. The district reinforced existing employee data security training programs as part of its corrective actions. No ransomware demands or extortion attempts were mentioned in the disclosure, focusing instead on the theft of sensitive personnel records. As Colorado's largest school district, the breach represented a significant compromise of education sector employee data, though the investigation did not identify threat actor motivations or attribution. The district maintained operations throughout the incident response period while working to secure affected systems against future intrusions.

Sources

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