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Incident

AccelHealth

Incident posture

Attack window
Dec 2021
Location
United States of America
Status
Historical
CIA posture
Available to members
Updated
2025-12-16 00:00

Linked entities

Victim
AccelHealth
Threat actors
0 actors
Sources
1 source

Timeline

Occurred
Dec 2021
Discovered
Pending
Disclosed
Pending
Resolved
Pending

Summary

AccelHealth experienced a ransomware attack that compromised its network for six days, potentially exposing sensitive patient information including names, Social Security numbers, financial details, health insurance data, and medical treatment records affecting 48,126 individuals. Forensic analysis found no evidence of data exfiltration or subsequent misuse, though the organization implemented enhanced security measures and provided affected patients with complimentary credit monitoring services while reporting the incident to federal regulators.

Motives

Detailed motive labels are available to members.

1 motive

TTPs

Detailed technique labels are available to members.

1 technique

Description

On December 15, 2021, Cross Timbers Health Clinics, operating as AccelHealth, experienced a ransomware attack that disrupted access to specific files and folders within its network. The Federally Qualified Health Center, based in Brownwood, Texas, initiated an investigation with third-party forensic specialists, revealing unauthorized actors first infiltrated the network on December 9, 2021. Attackers maintained network access for six days, during which they potentially viewed or obtained files containing sensitive patient information. A comprehensive review of compromised systems confirmed the exposure of protected health information belonging to 48,126 individuals. The forensic analysis identified no evidence of data exfiltration from AccelHealth’s systems.

The compromised data included patient names, addresses, dates of birth, Social Security numbers, driver’s license numbers, financial account details, health insurance information, medical record numbers, and treatment or diagnosis records. AccelHealth stated no reports indicated actual or attempted misuse of patient data at the time breach notifications were issued. In response, the organization implemented additional technical security measures to prevent future cyber incidents and provided affected individuals with complimentary credit monitoring services. The breach was reported to the HHS Office for Civil Rights, reflecting the confirmed impact on 48,126 patients. AccelHealth’s remediation efforts focused on securing network vulnerabilities exploited during the intrusion period from December 9 to December 15.

Sources

Sources available to members: 1 source.

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