Straten & Kollegen Listed by incransom Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On April 12, 2026, the ransomware group incransom listed Straten & Kollegen on its leak site and claimed to have exfiltrated internal files from the firm. The number of individuals whose information may be involved remains unknown, and no further details on the scope or confirmation of the listing have been made public. The incident highlights the exposure risks that arise when files from a tax advisory practice are removed without authorization, particularly for clients whose financial and business records are handled by such firms.

Inside the incident

Public reporting on the event is limited to the April 12 listing. The group asserts that internal files were taken during a ransomware operation, but no information has been released on the date of the intrusion, the volume of data, or whether any systems were encrypted. The number of people potentially affected is not stated.

The group behind it: incransom

Incransom is a ransomware operator that conducts intrusions into corporate networks, exfiltrates data, and lists selected victims on a public site. The group’s listings function as claims of possession; independent verification of the underlying access is not provided by the actor. Similar groups in this category have used data exposure as leverage in extortion attempts, though specifics tied to this listing remain unconfirmed.

About Straten & Kollegen

Straten & Kollegen GmbH is a tax consulting firm based in Nordhorn, Germany. It provides advisory services to businesses and private clients in the Grafschaft Bentheim and Emsland regions, including support for Dutch companies operating in Germany and specialized bookkeeping for agricultural enterprises and registered associations. Organizations of this type routinely process client tax returns, financial statements, and correspondence with tax authorities.

The information in question

The only detail released is that internal files were allegedly exfiltrated. The precise categories of data contained in those files have not been disclosed. Tax consulting firms commonly hold client identification details, income and expense records, bank information, and filings submitted to revenue authorities; whether any of these specific elements are present in the claimed exfiltration cannot be confirmed from available information.

Why it matters

Unauthorized access to internal files at a tax firm can place client financial records outside the control of the organization that collected them. Individuals and businesses may face subsequent misuse of identifiers or account details, while the firm itself must address regulatory notification obligations and potential operational disruption. The absence of confirmed data categories leaves the exact exposure level unclear for those served by the firm.

Were you affected?

Straten & Kollegen has not published a public statement on the listing or a dedicated notification process. Individuals who are or were clients can contact the firm directly to inquire about the status of their records. In the meantime, routine monitoring of tax accounts and financial statements remains a standard precaution.

• Request written confirmation from the firm on whether your data was among the exfiltrated files.
• Review recent tax filings and correspondence for any unexpected activity.
• Run a free exposure scan of your email address against known breach datasets to check for prior appearances of your information.

AICompiled with AI assistance from public sources and published under our editorial standards.