Disclosure context

About bravox

Bravox is an emerging ransomware group first observed in February 2026, operating with apparent financial motivations based on their targeting patterns and victim selection. The group has claimed responsibility for attacks against at least 9 organizations, though limited public reporting exists regarding their specific origin, country of operation, or confirmed affiliations with other cybercriminal groups. Based on available victim data, Bravox demonstrates a preference for targeting organizations in the United States, Switzerland, France, and Canada, with particular focus on healthcare and agriculture/food production sectors, though their victim profile also includes entities from unspecified industry verticals. Due to the group's recent emergence and limited documented activity, detailed information regarding their specific attack methodologies, initial access vectors, encryption techniques, or use of double extortion tactics has not been extensively reported by major security firms or law enforcement agencies. Given the recency of their first observed activity in early 2026, comprehensive analysis of notable campaigns, major victim organizations, or law enforcement disruption efforts remains limited in publicly available threat intelligence reporting. The group's current operational status appears active based on the timeline of their emergence, though their relatively small victim count and limited public visibility suggest they may be a smaller-scale operation compared to more established ransomware groups. The group has been linked to 14 public disclosures across our corpus. First observed on a leak site on February 11, 2026; most recent post May 12, 2026. The operation is currently active.

Timeline of this disclosure

March 11, 2026UMBERG TREUHAND AG listed by bravoxon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, UMBERG TREUHAND AG is reported in Switzerland, a country with 78 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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UMBERG TREUHAND AG

Claimed by bravox · listed 2 months ago

Age

since listed · data leaked

Status timeline

Listed
Mar 11, 2026
Data leaked

At a glance

Group: bravox
Status: Data leaked
Country: Switzerland
Sector: Not Found
Listed on leak site: Mar 11, 2026

About the victim

AI dossier — public-source company profile

Umberg Treuhand AG is an independent fiduciary and tax advisory firm rooted in the Glarnerland region of Switzerland. It provides consulting services to private individuals, commercial enterprises, industrial clients, public-sector organisations, and the service sector. The firm is a member of TREUHAND|SUISSE and is licensed as a RAB-approved audit expert.

Industry: Tax Advisory & Fiduciary Services
Address: Zwinglistrasse 6, 8750 Glarus, Switzerland

Attack summary

Severity: high — Data has been published by the threat actor. As a fiduciary and tax advisory firm, the stolen data is highly likely to contain regulated financial PII for private individuals and businesses, including sensitive tax records and financial plans, constituting a significant data exposure of sensitive client information.

The bravox ransomware group claims to have attacked Umberg Treuhand AG and has published data from the victim (disclosed status: data_published). The group states the company provides tax optimisation consulting, implying exfiltration of sensitive financial and tax-related client records.

high

Data the group says was taken

AI dossier — extracted from the leak post

Tax optimisation client records
Financial consulting documents
Private individual tax data
Business client financial data
Public organisation advisory files

What the group claims

The company provides tax optimization consulting for individuals, businesses, and public organizations.

Sources

Source

Indexed 2 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.