Karadeniz Holding (karadenizholding.com) Listed by fog Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On 3 February 2025, the ransomware group known as fog listed Karadeniz Holding, the Turkish energy company operating at karadenizholding.com, on its leak site. The group claims to have exfiltrated 1.5 TB of internal files during a ransomware attack. The number of people affected remains unknown, and public detail beyond the listing itself is limited. For an organisation of this scale, any confirmed exposure of internal material raises clear questions about operational continuity and the security of data that may touch employees, partners or commercial operations.

What is known so far rests on the group’s own claim rather than independent confirmation. No further technical indicators, ransom demands or official statements from the company have been made public at the time of reporting.

Inside the incident

The incident came to light through fog’s leak-site listing dated 3 February 2025. According to that listing, the group carried out a ransomware attack against Karadeniz Holding and exfiltrated 1.5 TB of internal files. No additional details have been released about the initial access method, the duration of any network presence, the encryption status of systems, or whether a ransom was demanded or paid. The number of individuals whose data may have been involved is listed as unknown. Public reporting has not confirmed whether the company has acknowledged the claim, begun recovery, or notified regulators or affected parties. In short, the scale and precise timing of the intrusion remain undisclosed beyond the volume figure and the date of the listing.

Who is fog?

Fog is a ransomware operation that became active in public view during 2024. Like many contemporary groups, it follows a double-extortion model: encrypting systems while also stealing data and threatening to publish it if payment is not made. The group typically posts victim names and sample file lists on a dedicated leak site to increase pressure. Public reporting has linked fog to attacks across multiple sectors and geographies, often using common initial-access techniques such as compromised credentials or unpatched remote services, though specific tooling can vary. Its listings are claims of successful intrusion and data theft; they are not independently verified until the victim or forensic investigators confirm them. In this case, the listing of Karadeniz Holding is presented solely as fog’s assertion.

Who is Karadeniz Holding (karadenizholding.com)?

Karadeniz Holding is a privately held Turkish energy company best known for its fleet of floating power plants—sometimes called power ships—that supply electricity to markets facing generation shortfalls. The group also maintains interests in related energy infrastructure and logistics. As a holding company operating across borders, it typically manages commercial contracts, technical designs, employee records, supplier information and operational data tied to power-generation assets. A breach involving such an organisation is consequential because energy-sector entities sit at the intersection of critical infrastructure, international trade and sensitive commercial negotiations. Even limited exposure of internal files can affect competitive positioning, contractual relationships and the personal data of staff working in multiple jurisdictions.

What data was at risk

The only data type named in public reporting is “internal files” said to have been exfiltrated in the ransomware attack, with a claimed volume of 1.5 TB. No further breakdown—such as whether the material included employee personal data, financial records, technical schematics, customer contracts or correspondence—has been disclosed. Organisations of this kind ordinarily hold a mix of human-resources files, procurement documents, engineering data and commercial agreements. Because the exact contents remain unconfirmed, it is not possible to state with certainty which categories of information were taken. The claim of 1.5 TB indicates a substantial volume, yet volume alone does not reveal sensitivity or the presence of personally identifiable information.

The real-world impact

For individuals whose details may appear in the stolen material, the practical risks include targeted phishing, identity fraud or social-engineering attempts that reference genuine internal context. Employees or contractors could face credential-stuffing attacks if login details or contact lists were among the files. For the organisation itself, the consequences centre on potential disruption of operations, loss of negotiating leverage if commercial documents surface, and the cost of forensic investigation, system restoration and any required regulatory notifications. Because the number of people affected is unknown and the precise data types are unconfirmed, the full scope of harm cannot yet be measured. Energy-sector incidents also carry secondary concerns around supply-chain trust and the security of critical infrastructure partners.

If your data was in this claimed breach

If you have a past or present connection to Karadeniz Holding—whether as an employee, contractor, supplier or partner—treat the possibility of exposure seriously until more detail emerges. Change passwords on any accounts that may have been linked to company systems, enable multi-factor authentication wherever available, and watch for unexpected emails or messages that reference internal projects or colleagues. Monitor financial accounts for unusual activity and consider placing fraud alerts with credit bureaus if personal identifiers were likely held by the company. Readers can also run a free exposure scan of their email address to check whether their information has already appeared in known breach data sets. Remain cautious of unsolicited contact claiming to offer remediation help; legitimate assistance will not demand payment or sensitive credentials up front.

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