Hess (hess-gmbh.de) Listed by fog Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Ransomware groups continue to target mid-sized European firms, using double-extortion tactics that combine encryption with data theft and public leak-site listings. In this environment, even organisations without a high public profile can find themselves named on criminal forums, with limited independent verification available at the time of disclosure.

On 12 February 2025, the German company Hess (hess-gmbh.de) was listed by the fog ransomware group. Public reporting indicates that internal files were exfiltrated in a ransomware attack and that the volume claimed is 6.5 GB. The number of people affected remains unknown, and further technical details have not been released.

Inside the incident

According to available reports, Hess was listed by the fog ransomware group on 12 February 2025. The listing states that internal files were exfiltrated during a ransomware attack and that the data volume involved is 6.5 GB. No confirmed information has been published about the precise date of initial intrusion, the attack vector used, or whether systems were encrypted in addition to the data theft. The number of individuals whose information may have been involved is listed as unknown. Public detail beyond the group’s claim and the reported 6.5 GB figure remains limited.

The group behind it: fog

Fog is a ransomware operation that has appeared in public reporting as employing double-extortion methods: encrypting victim systems while also stealing data and threatening to publish it on a dedicated leak site if payment is not made. Like other groups in this category, fog typically posts victim names, sometimes with sample files or volume claims, to increase pressure. The listing of Hess is therefore a claim made by the group itself; independent confirmation of the full scope or contents has not been provided in the available facts. Fog’s prior activity has followed patterns common to modern ransomware crews—targeting organisations across multiple sectors and using leak sites as a primary leverage tool—but no additional statements attributed to fog specifically about Hess beyond the listing itself are recorded here.

About Hess (hess-gmbh.de)

Hess operates under the domain hess-gmbh.de and is a German company. Organisations of this type commonly handle internal business records, employee information, supplier and customer correspondence, technical documentation, and operational data. A breach involving such material can affect both the firm’s day-to-day operations and the privacy of individuals connected to it. Because the company appears to function in a professional or industrial context typical of many German mid-market firms, the exposure of internal files carries potential consequences for commercial confidentiality as well as personal data protection under European rules.

What was likely exposed

The facts name the exposed material only as “internal files exfiltrated in ransomware attack,” with a reported volume of 6.5 GB. Exact file types, whether personal data of employees or customers was included, and any further classification remain undisclosed. Organisations of this kind typically hold a range of records that could appear in such a collection. Concrete points that can be stated from the public record are therefore limited:

• Internal files were claimed to have been taken.
• The volume reported is 6.5 GB.
• No specific data categories (for example, names, financial details, or credentials) have been confirmed.
• The number of affected individuals is unknown.

Until further verified information appears, any assumption about precise contents would be speculative.

The real-world impact

For individuals whose data may have been among the internal files, possible consequences include unwanted contact, phishing attempts that reference genuine company details, or identity-related misuse if personal identifiers were present. Because the exact contents are unconfirmed, the level of risk for any single person cannot be quantified from public sources. For Hess itself, the incident raises operational and reputational considerations: recovery from ransomware, potential regulatory notification duties under data-protection law, and the need to assess whether commercial or technical secrets were among the 6.5 GB claimed. The absence of a confirmed headcount of affected people means the full human and organisational footprint is still unclear.

If your data was in this claimed breach

If you have a past or present connection to Hess—as an employee, contractor, customer or supplier—treat the listing as a signal to take basic protective steps. Monitor financial and email accounts for unusual activity, enable multi-factor authentication where available, and be cautious of unsolicited messages that appear to reference the company. Change passwords that may have been reused across work and personal services. Readers can also run a free exposure scan of their email address to check whether that address has already appeared in known breach data sets. Public detail on this incident remains limited; further verified information, if released, should guide any additional actions.

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