Mattele Listed by stormous Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
The Mattele Listed by stormous Ransomware Group (reported April 25, 2022) is an unverified claim; the data involved is undisclosed belonging to roughly unknown people. If you have an account with them, your information may now be circulating on the open web and with data brokers. Here’s exactly what happened, how to check if you were affected, and what to do next.
What happened
Mattele appeared on the Stormous ransomware leak site on April 25, 2022. The group asserted that it had exfiltrated internal files during a ransomware attack. Public records do not disclose the date of the intrusion itself, the volume of data taken, or whether any files were subsequently published. The number of people whose information may be involved remains unknown.
Who is stormous?
Stormous is a ransomware group that has operated since at least 2021. It follows a double-extortion model in which data are encrypted on victim systems and copies are removed for possible disclosure. The group maintains a leak site where it lists organizations it claims to have targeted. Such listings serve as pressure tactics and are not independently verified at the time they appear.
About Mattele
Mattele is an organization that maintains internal operational records. Entities of this type routinely store documents related to business processes, communications, and administrative functions. Exposure of such material can reveal details about internal decision-making and relationships that are not intended for external view.
What was likely exposed
The only data category named in connection with the incident is internal files. The precise contents of those files have not been disclosed. Organizations in this category commonly hold records such as contracts, employee information, financial summaries, and technical documentation, but the exact composition of any exfiltrated material remains unconfirmed.
Why it matters
Internal files can contain information that affects operational continuity or the privacy of individuals referenced in those documents. If released, the material may be used for further targeting or public scrutiny. For the organization, the incident adds the cost of investigation, potential regulatory review, and the need to reassess access controls.
If your data was in this claimed breach
Monitor official statements from Mattele for any guidance on next steps. Change passwords for accounts that may have been referenced in internal records and enable multi-factor authentication where available. Individuals can also run a free exposure scan of their email address against known breach data sets to check for prior appearances of their information.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
More recent breaches
ioi Listed by stormous Ransomware GroupSuccess Neeti Listed by stormous Ransomware GroupA message to France Listed by stormous Ransomware GroupAurora hacked data Listed by stormous Ransomware GroupLatest breaches
Read GalaxyWarden’s full analysis of the Mattele Listed by stormous Ransomware Group →
Publicly posted by stormous — 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.