Burnham Brown listed on Inc Ransom leak site following claims of a data breach

• Ransomware group: Inc Ransom
• Country: United States
• Sector: Professional Services
• Announcement date: December 31, 2025

The Oakland-based law firm Burnham Brown has been listed on the Inc Ransom leak site. This listing follows claims made by the threat actors regarding a data breach involving the organization's internal network.

The alleged incident and claims made by Inc Ransom

On December 31, 2025, the ransomware group known as Inc Ransom announced that it had targeted Burnham Brown. According to the group's claims, they successfully gained unauthorized access to the firm's internal network. The threat actors allege that this access allowed them to exfiltrate various documents from the organization's systems.

As part of their public announcement on the leak site, the group has shared several document samples intended to demonstrate the nature of the breach. These samples are presented to support the group's claims of successful data exfiltration. No information was provided regarding the total size of the data stolen, the specific number of files taken, or a specific ransom demand.

Data involved in the alleged breach

Based on the samples provided by the threat actors, the leaked information appears to include sensitive organizational and personal data. The screenshots shared by the group show tables containing various types of information. The data identified in the samples includes:

• Employee personal data, such as full names, addresses, and email addresses
• Various legal documents

The presence of these documents suggests that the breach may impact the privacy of individuals associated with the firm and the confidentiality of legal matters handled by the practice.

About Burnham Brown

Burnham Brown is a law firm headquartered in Oakland, California. The firm provides a variety of legal services, including legal consulting and representation. Their practice areas cover several different sectors, such as retail, real estate, business, and employment law.

Analysis and implications for the professional services sector

This incident may pose a significant risk to the confidentiality of both client and employee data within Burnham Brown. Because the organization operates as a law firm, there is a possibility that sensitive client information and trade secrets may be included in the leaked data. The nature of legal practice requires a high degree of data protection to maintain attorney-client privilege and protect the interests of various parties.

As a United States-based entity, the firm may face specific legal obligations. This could include data breach notification requirements under various state laws and potential federal regulations. The consequences of such breaches often depend on the specific jurisdictions involved and the type of data compromised.

The tactics employed by the Inc Ransom group appear to follow a double-extortion model. In such scenarios, threat actors not only encrypt systems but also steal data to use as leverage. This increases secondary risks if the data is published on the internet or if a ransom is not paid. The leaked information could potentially be utilized by malicious actors for identity theft or for launching targeted phishing campaigns against the firm, its employees, or its clients.

Organizations operating in the professional services sector often face similar risks due to the high value of the sensitive information they manage. To mitigate these risks, common defensive steps include implementing robust network monitoring, enforcing multi-factor authentication, and maintaining strict access controls to limit the movement of unauthorized users within a network. Additionally, regular data encryption and comprehensive employee training on phishing awareness are standard practices to defend against the types of exfiltration and extortion tactics used by modern ransomware groups.