HIDROCARBUROS ARGENTINOS S.A. Listed by blacklock Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On 4 January 2025, HIDROCARBUROS ARGENTINOS S.A., an Argentine energy company also known as HASA, appeared on a listing associated with the blacklock ransomware group. The claim states that internal files were taken during a ransomware attack. The number of people whose information may be involved remains unknown, and public detail on the precise contents is limited. For employees, contractors, partners or others whose records sit inside such a company’s systems, the practical stakes are straightforward: personal or operational data that was never meant to leave the organisation may now be in the hands of criminals who specialise in pressure and resale.

Because the scale and exact data types have not been confirmed beyond the group’s claim of internal-file exfiltration, anyone connected to the firm must treat the situation as unresolved risk rather than settled fact. The listing itself is an assertion by the attackers; it has not been independently verified in the available record.

Breaking down the breach

According to the reported information, HIDROCARBUROS ARGENTINOS S.A. was listed by the blacklock ransomware group on 4 January 2025. The only description of the incident states that internal files were exfiltrated in a ransomware attack. No further public detail has been supplied on the date the intrusion began, the method of initial access, the volume of data taken, or the number of individuals affected. Those figures remain unknown or undisclosed.

The organisation is described as operating in the Energy, Utilities & Waste sector in Argentina, with roughly 638 employees and revenue reported at approximately $35.1 million. Headquarters are listed in Buenos Aires. Beyond the claim of file exfiltration, the public record does not confirm whether systems were encrypted, whether a ransom demand was made, or whether any negotiation took place. The listing is therefore best understood as an unverified assertion by the group rather than a fully documented breach report.

Inside blacklock

Blacklock is a ransomware operation that has appeared in public threat reporting as a group that encrypts victim systems and, when payment is not forthcoming, publishes stolen data on dedicated leak sites. Like other ransomware crews of this type, it typically gains access through common vectors such as compromised credentials, unpatched remote services or phishing, then moves laterally to locate and copy valuable files before deploying encryption. The group’s public listings serve both as pressure on the victim and as a marketplace signal to other criminals.

In this case the only specific claim tied to HIDROCARBUROS ARGENTINOS S.A. is the listing itself and the statement that internal files were exfiltrated. No additional statements, screenshots or file samples from blacklock about this particular organisation have been included in the available facts. Therefore any broader characterisation of the group’s usual methods is drawn from established public knowledge of its activity, not from Reported Details of this incident.

Who is HIDROCARBUROS ARGENTINOS S.A.?

HIDROCARBUROS ARGENTINOS S.A., often abbreviated HASA, is an Argentine company active in the Energy, Utilities & Waste industry. Public business profiles place its headcount in the 500-to-999 range (with one figure citing 638 employees) and its annual revenue in the $25-to-$50 million band, specifically around $35.1 million. It is headquartered in Buenos Aires, Buenos Aires F.D., Argentina.

Organisations of this kind typically manage operational data related to fuel, hydrocarbons or related utilities, together with the ordinary corporate records of any mid-sized firm: employee files, supplier contracts, financial documents, customer or partner correspondence, and technical or logistical information. A ransomware incident at such a company is consequential because energy-sector entities sit at the intersection of critical infrastructure, commercial supply chains and personal data. Disruption or leakage can affect both day-to-day operations and the privacy of the people whose information the company holds.

The information in question

The facts state only that “internal files” were exfiltrated in a ransomware attack. No inventory of specific data categories—such as names, national identity numbers, bank details, medical records, contracts or technical schematics—has been disclosed. The exact contents therefore remain unconfirmed.

Companies operating in energy and utilities commonly store employee personal data, payroll and tax information, supplier and customer contact details, invoices, operational logs and proprietary technical documents. Whether any of those categories were among the files taken in this incident is not known from the public record. Readers should treat the exposure as possible rather than proven for any particular data type.

Why it matters

When internal files leave an organisation under criminal control, the immediate risks are identity misuse, targeted phishing, financial fraud and, for the company itself, operational disruption and regulatory scrutiny. Employees or contractors whose personal details appear in the stolen material may face attempts to open accounts, file false claims or craft convincing social-engineering messages. Partners and suppliers whose commercial information is included can become secondary targets.

For HIDROCARBUROS ARGENTINOS S.A., the listing also creates reputational and contractual pressure. Even without confirmed encryption or downtime, the mere claim of data theft can trigger notification obligations under Argentine data-protection rules and can affect relationships with clients who expect confidentiality. Because the number of affected people is unknown and the precise data types are undisclosed, the full extent of individual harm cannot yet be measured; the prudent assumption is that anyone whose information resided in the company’s systems should remain alert.

What to do if you're exposed

If you have a past or present connection to HIDROCARBUROS ARGENTINOS S.A.—as an employee, contractor, supplier or customer—treat the blacklock listing as a prompt to act, not as proof that your own data has already been misused. Concrete first steps include:

• Monitor bank and credit-card statements for unfamiliar transactions and enable transaction alerts where available.
• Change passwords on any accounts that reused credentials associated with work email or company systems, and enable multi-factor authentication.
• Watch for phishing messages that reference the company, invoices or personal details that could have come from internal files; verify unexpected requests through a separate channel.
• Consider placing a fraud alert or credit freeze with the relevant Argentine credit-reporting services if you believe sensitive identity data may have been involved.
• Run a free exposure scan of your email address against known breach data sets to check whether that address has already appeared in other publicly indexed incidents.

Public detail on this particular event remains limited. Continued caution and routine security hygiene are the most practical responses until more verified information emerges.

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