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

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,640 disclosures indexed across all operators we track. Geographically, Contitec Empresarial is reported in Brazil, a country with 319 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

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Contitec Empresarial

Claimed by Knight · listed 2 years ago

250 GB

Data size

30m

Age

since listed · data leaked

Status timeline

Listed
Nov 30, 2023
Data leaked

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 2 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.