Was Mutant hit by ransomware?

Mutant 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 Mutant breach?

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

Ransomware victim disclosure

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Mutant

Claimed by Thegentlemen · listed 5 days ago

Age

since listed · data leaked

Status timeline

ListedSep 7, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Brazil
Listed on leak site: Sep 7, 2026

About the victim

AI dossier — public-source company profile

Mutant is one of Latin America's largest AI-driven customer experience platforms, headquartered in São Paulo with 4,000+ employees across 14 countries. Founded in 2016 as a spin-off from Genesys Brazil and backed by Permira, GIC, and TCV, it processes 3.5 billion AI-driven interactions annually for 100+ enterprise clients including major Brazilian banks, telecom, and retail companies.

Industry: Artificial Intelligence & Customer Experience (CX) Platform
Address: Rua Hungria, 574 – Jardim Europa, São Paulo – SP, 01555-903, Brazil
Employees: 4000+
Founded: 2016

Attack summary

Severity: high — Mutant handles sensitive customer interaction data for regulated financial institutions (Itaú, Santander, Caixa), telecom providers (Vivo, Claro), and processes personally identifiable information at scale through 3.5B annual interactions. Even without disclosed data categories, compromise of a CX platform serving major financial services clients poses significant risk to regulated data and customer PII.

The threat actor claims to have compromised Mutant and published exfiltrated data. The leak post does not specify what data categories were exfiltrated, what operational systems were encrypted, or provide details of the attack method, only asserting access to the company.

high

What the group claims

mutant.com.br zoominfo.com/c/mutant/452328184 Mutant is one of Latin America's largest CX & AI companies, founded in 2016 as a spin-off from Genesys Brazil, HQ'd in São Paulo with 4,000+ employees across 14 countries. Backed by Permira, GIC and TCV, its holding "Clash" raised $75M from BlackRock in 2025 for M&A and AI. It runs 3.5 billion AI-driven interactions per year for 100+ enterprise clients — including the world's largest corporate WhatsApp operation (Caixa) — with clients like Itaú, Vivo, Santander, Claro and iFood. Built through 8+ acquisitions (Interaxa, GRB, Intervalor...), it projects ~R$1B revenue in 2026 and pours R$100M+/year into its proprietary generative AI ecosystem (IAM/Xavier/PALI). Bottom line: the quiet AI-giant of Brazilian customer experience — "Artificial Intelligence, Human Experiences" — now repositioning as the enterprise AI-intelligence layer of LatAm.

Sources

Victim sitemutant.com.br

Source

Indexed 5 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 838 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post September 9, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

September 7, 2026Mutant listed by thegentlemen on the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 838 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

Geographically, Mutant is reported in Brazil, a country with 209 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Mutant 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.