Was Oldelval Oleoductos del Valle hit by ransomware?

Oldelval Oleoductos del Valle was listed by the thegentlemen ransomware operation (Argentina), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the thegentlemen ransomware group?

thegentlemen is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Oldelval Oleoductos del Valle breach?

thegentlemen published data attributed to Oldelval Oleoductos del Valle. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Oldelval Oleoductos del Valle

Claimed by Thegentlemen · listed 6 days ago

Age

since listed · data leaked

Status timeline

ListedJul 23, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Argentina
Sector: Energy & Utilities
Listed on leak site: Jul 23, 2026

About the victim

AI dossier — public-source company profile

Oldelval (Oleoductos del Valle S.A.) is a leading Argentine midstream energy company specializing in the transportation of liquid hydrocarbons. Based in Cipolletti, Río Negro, it transports over 50% of Argentina's oil production and approximately 80% of oil from the Neuquén Basin, with a national concession extended to 2037.

Industry: Oil & Gas Transportation / Midstream Energy
Address: Cipolletti, Río Negro, Argentina
Founded: 1963

Attack summary

Severity: high — Confirmed data exfiltration from a critical infrastructure operator (oil transportation) responsible for majority of national hydrocarbon flows. Operational disruption to this company could impact national energy security. No ransom demand suggests data may have been published or monetized separately.

The ransomware group 'thegentlemen' claims to have breached Oldelval and published data. No specific details on encryption, exfiltration scope, or data categories are provided in the post excerpt.

high

What the group claims

***.com zoominfo.com/c/oleoductos-del-valle-sa/456337922 Oldelval (Oleoductos del Valle S.A.) is a leading Argentine midstream energy company specializing in the transportation of liquid hydrocarbons. Based in Cipolletti, Río Negro, it transports over 50% of the oil produced in Argentina and approximately 80% of the oil from the Neuquén Basin. With over 60 years of history, the company focuses on sustainable operations, safety, and infrastructure maintenance, having recently extended its national concession until 2037.

Sources

Victim siteoldelval.com

Source

Indexed 6 days ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 655 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post July 28, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

July 23, 2026Oldelval Oleoductos del Valle listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 655 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

This disclosure adds to ransomware activity in the Energy & Utilities sector, which has 166 disclosures indexed across all operators we track. Geographically, Oldelval Oleoductos del Valle is reported in Argentina, a country with 30 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Oldelval Oleoductos del Valle appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Monitor for the data appearing on thegentlemen's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.