Rempe Construction Listed by sinobi Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Rempe Construction, a construction services firm based in Novato, California, was listed on November 23, 2025, by the sinobi ransomware group. The listing states that internal files were exfiltrated during a ransomware attack. The number of individuals whose information may be involved remains unknown, as does any confirmation of the data’s scope or subsequent use. For clients, employees, and business partners of a construction company, such an event raises questions about the handling of project records, financial details, and personal identifiers that firms in this sector routinely maintain.

What happened

The only confirmed public information is the November 23, 2025 listing by sinobi. The group claims to have obtained internal files through a ransomware operation. No official statement from Rempe Construction has been referenced in available records, and details such as the date of the intrusion, the volume of data taken, or the method of initial access have not been disclosed.

Inside sinobi

Sinobi is a ransomware group that maintains a public leak site where it lists organizations it claims to have targeted. The group’s typical pattern involves encrypting systems and exfiltrating data, then threatening to publish the material unless a ransom is paid. Listings on the site represent the group’s assertions rather than independently verified events. Prior activity attributed to sinobi has followed this double-extortion model across multiple industries, though each claim must be evaluated on its own evidence.

About Rempe Construction

Rempe Construction provides building and construction services to clients in Novato, California, and surrounding areas. Organizations of this type manage contracts, subcontractor agreements, employee records, client specifications, and financial documentation tied to ongoing projects. A breach affecting such a firm can expose information that spans both corporate operations and the personal details of individuals connected to those projects.

What was likely exposed

The listing refers only to “internal files exfiltrated in ransomware attack.” No inventory of specific file types or data categories has been released. Construction companies commonly store employee tax forms, client contact information, bid documents, insurance records, and project schedules; whether any of these categories are present in the claimed exfiltration is unconfirmed.

The real-world impact

Individuals whose records appear in construction-industry files may face risks of identity misuse or targeted fraud if personal identifiers are among the material. The organization itself may encounter operational delays while restoring systems and responding to any regulatory or client inquiries. Without a published list of affected records, the precise scale of these risks cannot be quantified from public sources.

Were you affected?

Begin by contacting Rempe Construction directly to inquire whether your information was involved and what steps the company is taking. Monitor financial accounts and credit reports for unusual activity. Consider placing a fraud alert with major credit bureaus if you have shared personal details with the firm. Readers can also run a free exposure scan of their email address against known breach data sets to check for prior appearances in public listings.

• Request confirmation from the company about any notification process.
• Review bank and credit statements regularly for the next several months.
• Change passwords for any accounts linked to the organization.
• Retain records of all correspondence with the company.

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