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MB Contabilidade

Claimed by Vect · listed 5 months ago

121.03 GB
Data size
4m
Age
since listed · data leaked

Status timeline

  1. ListedFeb 24, 2026
  2. Data leakeddate unknown

At a glance

Group
Vect
Status
Data leaked
Country
Brazil
Listed on leak site
Feb 24, 2026
Data size
121.03 GB

About the victim

AI dossier — public-source company profile

MB Contabilidade is a full-service accounting and consulting firm founded in 1969 by Marcus Guedes Barra and currently directed by his children Guilherme and Aline. Based in Juiz de Fora, Minas Gerais, Brazil, the firm serves clients across multiple sectors including commerce, healthcare professionals, and service providers. Services include tax advisory, payroll management, financial BPO, HR outsourcing, and company formation.

Industry
Accounting & Bookkeeping Services
Address
Juiz de Fora, Minas Gerais, Brazil
Founded
1969

Attack summary

Severity: critical — 121 GB of exfiltrated data from an accounting firm encompasses highly sensitive multi-client financial records, balance databases, HR data, legal documents, and system tokens spanning numerous third-party businesses, constituting large-scale exposure of regulated financial and personal data across many client organisations.

The group 'vect' claims to have exfiltrated approximately 121.03 GB of data from MB Contabilidade, including shared company directories, accounting system data, balance databases, HR records, legal files, system tokens, and multi-client company instances. The status is listed as 'NEGOTIATING' with a published deadline, indicating data has been published or is staged for release.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Public/shared company directories (general, accounting I & II, HR, legal, indexes)
  • System tokens and credentials
  • Accounting system data
  • Balance sheet databases (multiple company instances)
  • Client/company records
  • HR records
  • Legal files

What the group claims

Status: STATUS: NEGOTIATING | Sector: accounting | ├─ Public/shared company directories (general, accounting I & II, HR, legal, indexes, systems, tokens) ├─ Accounting system data and balance databases (multiple company instances) ├─ Client/company... DATA SIZE: 121.03 GB | Deadline: 8d 4h

Sources

Source

Indexed 5 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.

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Disclosure context

About vect

The Vect ransomware group is an emerging threat actor first observed in January 2026, operating with apparent financial motivations based on their ransomware deployment patterns. With limited public documentation available from major cybersecurity organizations, the group's country of origin and potential affiliations remain unclear, though their targeting patterns suggest a relatively small-scale operation compared to established ransomware families. Based on available victim data, Vect has compromised at least 23 organizations globally, with primary focus on Brazil, the United States, South Africa, Namibia, and Egypt, demonstrating a geographically diverse targeting approach that spans multiple continents. The group appears to concentrate their attacks on manufacturing, healthcare, technology, and energy sectors, suggesting they may seek targets with critical infrastructure dependencies or valuable data assets, though their specific attack methodologies and encryption techniques have not been extensively documented by major threat intelligence providers. Given the group's recent emergence in early 2026, comprehensive analysis of their tactics, techniques, and procedures remains limited in public threat intelligence reporting. As of current reporting, Vect appears to remain active, though the limited public visibility suggests they operate at a smaller scale compared to prominent ransomware-as-a-service groups that typically attract more extensive law enforcement and security researcher attention. The group has been linked to 25 public disclosures across our corpus. First observed on a leak site on January 6, 2026; most recent post April 15, 2026. The operation is currently active.

Timeline of this disclosure

  • February 24, 2026MB Contabilidade listed by vecton the group's public leak site
Data size
121.03 GB

Other recent disclosures by vect

vect has been linked to 25 public victims on Darkfield. A sample of the most recent:

See the full vect dossier →

Sector and geography

Geographically, MB Contabilidade is reported in Brazil, a country with 404 ransomware disclosures in our corpus.

If your organisation is affected

A listing by vect means MB Contabilidade appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Report the incident to your national CERT, CERT.br (Brazil), as required for your jurisdiction.
  • Monitor for the data appearing on vect's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.