MBM Listed by thegentlemen Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
MBM was listed by thegentlemen ransomware group on January 11, 2026, after internal files were exfiltrated in a ransomware attack. Individuals connected to MBM should verify whether their information was involved and take appropriate protective steps.
What happened
The listing appeared on the group’s leak site on the reported date. The entry states that files were taken during a ransomware operation against MBM. No confirmation of the claim has been issued by MBM, and no information on the method of access, the duration of any intrusion, or the scale of the data removal has been disclosed.
Who is thegentlemen?
Thegentlemen is a ransomware group that maintains a public leak site where it lists organisations it claims to have targeted. Such groups typically encrypt systems and threaten to publish stolen material unless a ransom is paid. The listing of MBM constitutes the group’s claim of involvement; independent verification of the incident has not been reported.
MBM and its sector
MBM is a Polish firm with more than eight years of operation in professional training and compliance support. Its clients include public bodies and private companies that seek assistance with legal requirements, audits and documentation, particularly in the areas of personal-data protection and workplace obligations. Organisations in this sector routinely process information about their clients’ internal procedures and, in some cases, personal data related to training participants.
The information in question
The listing refers only to “internal files exfiltrated in ransomware attack.” The precise categories of data involved have not been disclosed. Companies of this type commonly hold records relating to client contracts, training materials, audit reports and compliance documentation; whether any of these categories, or any personal data, were among the files cannot be confirmed from available information.
What's at stake
Exposure of internal compliance and training records could reveal operational details of client organisations and, where personal data are present, could affect individuals whose information appears in those records. For MBM itself, the incident may require notification to regulators and clients under applicable data-protection rules, along with remediation of any systems that were accessed.
What to do if you're exposed
Individuals who have received services from MBM or similar providers should monitor their accounts for unusual activity and consider placing fraud alerts with credit agencies if financial or identity-related information may be involved. A free exposure scan of an email address against known breach data sets can indicate whether the address has appeared in previously published records. Organisations should follow their incident-response plans and consult legal counsel regarding any regulatory obligations.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
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Publicly posted by thegentlemen — 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.