Was Contitec Empresarial hit by ransomware?

Contitec Empresarial was listed by the Knight 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 Knight ransomware group?

Knight 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 Contitec Empresarial breach?

Knight published data attributed to Contitec Empresarial (~250 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Contitec Empresarial

Claimed by Knight · listed 3 years ago

250 GB

Data size

31m

Age

since listed · data leaked

Status timeline

ListedNov 30, 2023
Data leakeddate unknown

At a glance

Group: Knight
Status: Data leaked
Country: Brazil
Sector: Business Services
Listed on leak site: Nov 30, 2023
Data size: 250 GB

About the victim

AI dossier — public-source company profile

Contitec Empresarial is a Brazilian professional services firm based in Cuiabá, Mato Grosso, specializing in accounting, fiscal, labor, and tax services for businesses. The company provides a full suite of financial administration solutions aimed at supporting business growth. It operates under the domain contitec.net.br and can be reached at [email protected].

Industry: Accounting & Tax Advisory Services
Address: Rua Comandante Costa, 827 - Centro Norte, 78005-400 - Cuiabá - MT, Brazil

Attack summary

Severity: critical — 250 GB of exfiltrated data from an accounting and tax advisory firm almost certainly contains highly sensitive regulated financial, tax, and payroll PII for numerous business clients at scale, meeting the threshold for critical severity.

The Knight ransomware group claims to have exfiltrated 250 GB of data from Contitec Empresarial, publishing three proof screenshots (including directory/folder listings) as evidence of the breach.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Client accounting records
Fiscal and tax documentation
Labor and payroll records
Internal file directories

The group's post references roughly 3 proof files.

What the group claims

https://www.contitec.net.br/    *250GB OF STOLEN DATA* Atuamos no mercado auxiliando empresas nas áreas contábil, fiscal, trabalhista e tributária. Por meio da dedicação e do comprometimento da nossa equipe, você dispõe de uma linha completa de serviços que facilitam a sua administração financeira.Conte com soluções seguras e tenha a contribuição certa para o crescimento do seu negócio.CONTITECRua Comandante Costa - 827 - Centro Norte - 78005-400 - Cuiaba - MT(65) [email protected]_5.png 73.38 KBpastas.png 131.13 KBpastas2.png 135.14 KB

Sources

Source

Indexed 3 years 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 Knight

Knight is a relatively new ransomware group that emerged in September 2023, operating with primarily financial motivations and demonstrating a focus on targeting critical infrastructure and high-value sectors. The group's origin and specific affiliations remain largely undocumented in public threat intelligence reports, though their operational patterns suggest they operate as an independent entity rather than a established ransomware-as-a-service model. With 48 known victims since their emergence, Knight has shown a preference for targeting organizations across the United States, Brazil, Italy, Spain, and Germany, with particular focus on healthcare, manufacturing, media, and government sectors. Their attack methodology and specific technical capabilities have not been extensively documented by major security firms, though their targeting of healthcare and government entities suggests they employ effective initial access techniques and likely utilize double extortion tactics common among contemporary ransomware groups. While specific notable campaigns have not been widely publicized by CISA, FBI, or major security researchers, the group's consistent activity across multiple countries and high-value sectors indicates sustained operational capability. Knight appears to remain active as of current reporting, though detailed technical analysis and specific law enforcement actions against the group have not been publicly documented by authoritative sources. The group has been linked to 48 public disclosures across our corpus. First observed on a leak site on September 6, 2023; most recent post February 12, 2024. The operation is currently inactive.

Timeline of this disclosure

November 30, 2023Contitec Empresarial listed by Knighton the group's public leak site

Data size: 250 GB

Other recent disclosures by Knight

Knight has been linked to 48 public victims on Darkfield. A sample of the most recent:

See the full Knight dossier →

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 3,796 disclosures indexed across all operators we track. Geographically, Contitec Empresarial is reported in Brazil, a country with 404 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Knight means Contitec Empresarial 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 Knight'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.