Homestead Museum Listed by sinobi Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On November 23, 2025, the Homestead Museum appeared on a listing associated with the sinobi ransomware group. The number of individuals affected is not known, and the precise contents or volume of any material taken have not been confirmed publicly. The incident involves the claimed exfiltration of internal files during a ransomware operation. No further details on the timing of access, the method of entry, or the scale of the activity have been disclosed.

What happened

The Homestead Museum was listed by the sinobi ransomware group on November 23, 2025. The listing references a ransomware attack in which internal files were said to have been removed from the organization’s systems. No independent confirmation of the listing or the data removal has been made public, and the organization has not released statements detailing the events.

The group behind it: sinobi

Sinobi is a ransomware operator that has conducted multiple campaigns involving encryption of systems and the removal of data for potential disclosure. The group maintains a public listing of claimed victims and has previously targeted organizations across various sectors. In this case, the group claims the Homestead Museum as a victim through its leak site; that claim remains unverified by outside sources.

Who is Homestead Museum?

The Homestead Museum is a historic-cultural landmark in the City of Industry, California. It preserves and presents the history of Los Angeles from the 1840s to the 1920s through preserved structures, gardens, and educational programs that include workshops, tours, storytelling, crafts, and genealogy sessions. As a nonprofit cultural institution, it maintains records related to operations, visitors, donors, staff, and program participants.

What was likely exposed

The only data type identified in connection with the incident is internal files exfiltrated during the ransomware attack. The exact nature of those files has not been disclosed. Organizations of this type commonly hold contact information, membership or donor records, financial documents, employee files, and program-related materials, but it is not confirmed whether any of these categories were among the files referenced in the listing.

What's at stake

Individuals whose information appears in internal museum records could face risks such as unauthorized use of contact details or attempts to exploit financial information if such data were later circulated. For the museum itself, exposure of operational files could affect administrative functions, donor relations, and compliance obligations under applicable privacy regulations. The absence of Reported Details limits precise assessment of these risks at present.

If your data was in this claimed breach

Monitor bank and credit accounts for unusual activity and consider placing a fraud alert with major credit bureaus. Change passwords for any accounts associated with the museum and enable multi-factor authentication where available. Readers can also run a free exposure scan of their email address against known breach data sets to check for prior appearances of their information.

AICompiled with AI assistance from public sources and published under our editorial standards.