Was Lider Aviacao hit by ransomware?

Lider Aviacao was listed by the thegentlemen ransomware operation (Brazil), 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 Lider Aviacao breach?

thegentlemen published data attributed to Lider Aviacao. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Lider Aviacao

Claimed by Thegentlemen · listed 4 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedSep 5, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Brazil
Sector: Transportation
Listed on leak site: Sep 5, 2026

About the victim

AI dossier — public-source company profile

Líder Aviação is Latin America's largest business aviation company, founded in 1958 in Belo Horizonte, Brazil. It operates as a diversified aviation conglomerate offering aircraft charters (including online booking), a large FBO network, aircraft sales (HondaJet exclusive dealer), maintenance and repair (MRO), and offshore helicopter operations for Petrobras. The company operates 50+ aircraft across 22 bases with ~1,300 staff and approximately R$1.2B annual revenue.

Industry: Business Aviation & Helicopter Services
Address: Belo Horizonte, Brazil (headquarters); 22 operating bases across Latin America
Employees: 1300
Founded: 1958

Attack summary

Severity: medium — Data published status with no proof files, screenshots, or specific data inventory provided in the leak post. The absence of proof, operational impact detail, or confirmed data type prevents higher severity classification. Medium reflects listing on a known ransomware group's site with published status, indicating some level of compromise claim.

The leak post does not explicitly state what data was exfiltrated or the nature of the attack (encryption vs. exfiltration). The group lists the company on its leak site claiming disclosure of data, but the post provided contains only company profile information and does not detail specific compromised data or attack methodology.

medium

What the group claims

lideraviacao.com.br zoominfo.com/c/líder-aviação/372493800 Líder Aviação is Latin America's largest business aviation company, founded in 1958 in Belo Horizonte, Brazil, as an air taxi with a single Cessna 170. Today: ~R$1.2B revenue, 1,300+ staff, 50+ aircraft, 22 own bases; 42.5% owned by US Bristow Group, run by the founder's third generation (President: Junia Hermont). A one-stop shop: charters (first booking app in Brazil), the region's largest FBO network, aircraft sales (exclusive HondaJet dealer, 1,000+ sold), a top MRO (authorized for Bell, HondaJet, Gulfstream) and offshore helicopter ops for Petrobras since 1973 (1M+ flight hours). Key edge: safety — the only Brazilian company with IS-BAO Stage 3, plus Argus Platinum and 5× Petrobras Peotram wins. First SAF flight in Brazilian business aviation (2024), now expanding into agribusiness and electric aviation. Bottom line: a 67-year-old family giant controlling South American business aviation end-to-end.

Sources

Victim sitelideraviacao.com.br

Source

Indexed 4 hours 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 817 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post September 5, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

September 5, 2026Lider Aviacao listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 817 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 Transportation sector, which has 47 disclosures indexed across all operators we track. Geographically, Lider Aviacao is reported in Brazil, a country with 209 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Lider Aviacao 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.
Report the incident to your national CERT, CERT.br (Brazil), as required for your jurisdiction.
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.