CASHMAG Listed by avaddon Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
The CASHMAG Listed by avaddon Ransomware Group (reported September 9, 2021) 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.
On September 9, 2021, the ransomware group Avaddon listed CASHMAG on its data-leak site. The listing stated that internal files had been taken during a ransomware operation against the organisation. No figure for the number of individuals affected has been published, and the precise contents of the material have not been described beyond the general category of internal files.
The incident forms part of a wider pattern in which ransomware operators combine encryption of systems with the threat of publishing stolen material. When an organisation’s name appears on a leak site, the claim itself becomes public even if the files are never released, creating uncertainty for anyone whose records may have been held by the victim.
Inside the incident
The only confirmed public information is the September 9, 2021 listing on Avaddon’s site. The group asserted that it had exfiltrated internal data from CASHMAG. No independent confirmation of the volume of data, the date of the intrusion, or the technical method used has been released. The number of people whose information may be involved remains unknown.
The group behind it: avaddon
Avaddon operated as a ransomware-as-a-service group between 2020 and 2021. Its model involved supplying encryption tools to affiliate attackers in exchange for a share of ransom payments. The group routinely employed double-extortion tactics: after encrypting files on victim systems, it copied data and threatened to publish it on a dedicated leak site if the ransom demand was not met. Several other organisations were listed on the same site during the same period.
CASHMAG and its sector
CASHMAG appears to operate in the financial-services or payments sector, where companies routinely process transaction records, account details and internal operational documents. Such entities maintain systems that handle sensitive commercial and, in some cases, personal financial information. A successful intrusion at one of these firms can therefore expose both corporate records and data belonging to customers or counterparties.
The information in question
The listing refers only to “internal files.” No inventory of specific data types has been published. Organisations of this kind commonly store transaction histories, customer identifiers, account numbers and internal communications. Without a confirmed list, it is not possible to state which categories of information were actually taken.
Why it matters
Exposure of internal files can create downstream risks for individuals whose financial records are held by the affected organisation, including the possibility of fraud or identity misuse. For the organisation itself, the incident may lead to regulatory scrutiny, operational disruption and costs associated with investigation and remediation. The absence of published details leaves both the scale of potential harm and the status of any data still unclear.
If your data was in this claimed breach
Monitor bank and credit-card statements for unusual activity and consider placing fraud alerts with credit-reference agencies. Change passwords for any accounts linked to the organisation and enable multi-factor authentication where available. Readers can also run a free exposure scan of their email address against known breach data sets to check whether their information has appeared in previously published collections.
AICompiled with AI assistance from public sources and published under our editorial standards.
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Read GalaxyWarden’s full analysis of the CASHMAG Listed by avaddon Ransomware Group →
Publicly posted by avaddon — 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.