MB Contabilidade Listed by vect Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
MB Contabilidade was listed by the vect ransomware group on 24 February 2026 after internal files were exfiltrated in a ransomware attack. The number of people affected has not been disclosed; anyone who has shared data with the firm should verify whether their information may have been compromised and take protective steps.
What happened
The available information comes from a public listing on the vect group's site. It describes exfiltration of internal files from MB Contabilidade, an accounting organization, and references a data volume of 121.03 GB. Specific directories mentioned in the listing include public and shared company directories covering general, accounting, HR, legal, and systems areas, along with accounting system data and balance databases for multiple company instances. No independent confirmation of the volume, contents, or timeline has been published, and the status is described only as negotiating.
Who is vect?
Vect is a ransomware group that has been publicly tracked for several years. Its documented pattern involves gaining access to corporate networks, exfiltrating data, deploying encryption, and posting victim details on a leak site when ransom negotiations stall or fail. The group typically sets deadlines and publishes file samples or directory listings to increase pressure. Its listings constitute claims made by the group itself and are not verified by third parties unless additional evidence emerges.
About MB Contabilidade
MB Contabilidade operates in the accounting sector, providing services that commonly include bookkeeping, tax preparation, payroll processing, and financial reporting for client companies. Organizations in this sector routinely store records that contain client financial statements, tax identifiers, employee data, and transactional details. A compromise at such a firm can therefore affect not only the company's own operations but also the records of its clients.
What was likely exposed
The listing names internal files and references directories that include accounting databases, HR materials, legal documents, and client or company records. The exact contents of the 121.03 GB have not been independently verified or itemized beyond the high-level descriptions in the post. Public detail on specific data fields or the number of individuals whose information appears in those files remains limited.
The real-world impact
Accounting records often contain identifiers and financial information that can be used for fraud or identity misuse if released. Clients of the firm may face risks of targeted scams, unauthorized account access, or tax-related fraud. For the organization, the incident can lead to regulatory scrutiny, loss of client trust, and costs associated with investigation and remediation. The scale of these effects cannot be quantified until more details on the data and affected parties are confirmed.
If your data was in this claimed breach
Monitor bank and tax accounts for unusual activity and review statements regularly. Place fraud alerts or credit freezes with relevant agencies if personal identifiers appear to have been involved. Organizations and individuals can run a free exposure scan of their email addresses against known breach data to check for prior appearances in published records.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
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Publicly posted by vect — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.