On August 13, 2025, construction contractor J. Derenzo Co. appeared on the leak site of the sinobi ransomware group. The company, a well-known site-work specialist in New England with more than 75 years of operation, is claimed to have had internal files exfiltrated during a ransomware attack.
Already exposed?
You can’t unleak data. You can take away what it’s worth.
A leaked record is where it starts, not where it ends. What turns it into your front door is the look-up sites publishing your address beside your name — and those are what an AI reads when somebody asks about you. The free scan shows you both. We write to 580 companies.
See what is exposed about you — free scan →Watch J Derenzo
Get alerted the next time J Derenzo files a breach with any US regulator — the filing, dated and sourced. A free single-company slice of Signals; no account needed.
We’ll email you only about J Derenzo’s future breach filings and how to watch a whole vendor list — not general marketing. Unsubscribe any time.
Watching your whole vendor list (50 to 500 companies, by tier) is GalaxyWarden Signals.
What Public Reporting Shows
Public reporting indicates that sinobi listed J. Derenzo on its dark-web leak page and claimed to have stolen internal company files. The exact number of affected individuals remains unknown, and the precise volume or types of data have not been independently verified. Available reporting describes the incident as a classic ransomware operation in which the threat actors first gained access, encrypted systems, and then threatened to publish the stolen information unless a ransom was paid.
Internal files were the primary material exfiltrated. No customer lists, employee records, or specific data categories have been detailed in the public leak notice. The listing carries the typical extortion timeline used by this group, although the exact deadline has not been disclosed in secondary coverage.
Why This Matters for You and Your Family
When a regional business like a construction contractor is hit, the information inside its files can easily include details about suppliers, subcontractors, project bids, employee payroll, or even contracts that list home addresses and personal phone numbers. If your name, address, or contact information appears in any of those documents, it can surface on the open internet or in underground marketplaces. That single exposure often becomes the starting point for identity theft, phishing campaigns, or unwanted solicitations aimed at you and your family.