CPS Listed by sinobi Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
The Crown Prosecution Service (CPS) has been listed by the Sinobi ransomware group, with the incident coming to public attention on 9 December 2025. An undisclosed number of people may have been affected by the exfiltration of internal files; anyone connected to the CPS is advised to review official guidance and monitor their personal information.
On December 09, 2025, the ransomware group sinobi listed CPS on its leak site, claiming to have exfiltrated internal files from the North Dakota engineering firm. The number of individuals whose information may be involved remains unknown, and no further details on the scope or confirmation of the listing have been made public.
The incident matters because CPS works with municipal governments and agencies on projects involving infrastructure, land records, and regulatory documentation. Any exposure of internal materials from such an organization can affect planning processes and client data held in the ordinary course of business.
Breaking down the breach
The only confirmed public detail is the listing itself. CPS, Ltd. was added to the sinobi leak site on the reported date. The group claims internal files were taken during a ransomware attack. No information has been released on the number of files, the timeline of the intrusion, or whether any data was subsequently published.
Who is sinobi?
Sinobi is a ransomware operator that targets organizations and lists victims on a dedicated leak site when negotiations fail. Like other groups in this category, it typically combines encryption of systems with the removal of data to create leverage. Public records show the group has claimed responsibility for incidents across multiple sectors in recent years, though specific tactics and victim lists vary.
About CPS
CPS, Ltd. is an engineering firm established in 1979 and based in Grand Forks, North Dakota. It provides municipal engineering, transportation planning, water resources management, solid waste services, construction engineering, land planning, and surveying for clients that include local governments and agencies in North Dakota and northwest Minnesota. Organizations of this type routinely handle project documentation, survey data, and correspondence with public-sector clients.
The information in question
The listing refers only to “internal files exfiltrated in ransomware attack.” No inventory of specific file types or data categories has been disclosed. Engineering firms commonly store design documents, client correspondence, survey records, and regulatory submissions, but the exact contents of any exfiltrated material remain unconfirmed.
What's at stake
Exposed internal files could contain project details or client communications that are not intended for public release. For individuals or agencies named in those records, the primary concerns are loss of confidentiality and potential misuse of technical or administrative information. The organization faces operational disruption and the need to assess whether any third-party data was involved.
Were you affected?
Because the number of individuals potentially impacted is unknown, anyone who has worked with CPS or its public-sector clients should monitor official statements from the company. Practical first steps include:
- Reviewing recent correspondence from CPS or partner agencies for any direct notification.
- Changing passwords for any accounts linked to projects involving the firm.
- Running a free exposure scan of your email address against known breach data to check for prior appearances.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
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Publicly posted by sinobi — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
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