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Colégio Miguel de Cervantes

listed as cmc.com.br · Claimed by LockBit · listed 7 months ago

6m
Age
since listed · data leaked

Status timeline

  1. ListedDec 26, 2025
  2. Data leakeddate unknown

At a glance

Group
LockBit
Status
Data leaked
Country
Brazil
Listed on leak site
Dec 26, 2025

About the victim

AI dossier — public-source company profile

Colégio Miguel de Cervantes (CMC) is a private bilingual (Portuguese-Spanish) K-12 school located in the Morumbi district of São Paulo, Brazil. The school offers education from early childhood through high school, including the International Baccalaureate programme, and spans 57,000 m² with 107 learning environments. It has served over 40,000 students throughout its history and employs 39 masters and/or doctoral-level educators.

Industry
K-12 Private Education
Address
Av. Jorge João Saad, 905 - Morumbi - CEP 05618-001 - São Paulo, Brazil

Attack summary

Severity: high — Data has been confirmed published by LockBit against an educational institution likely holding PII of minors (students), parents, and staff including names, contact details, enrollment contracts, and potentially financial data — constituting significant regulated personal data exposure at scale.

LockBit claimed an attack against Colégio Miguel de Cervantes and has published data (disclosed status: data_published), indicating exfiltration of school data. No ransom amount or specific data volume was stated in the leak post.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Student records
  • Staff/faculty records
  • Administrative documents
  • Enrollment and contract data
  • Financial/payment records
  • Contact and personal information

What the group claims

Colégio Miguel de Cervantes: CMC

Sources

Source

Indexed 7 months 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 LockBit

LockBit is a highly prolific ransomware group that emerged in October 2020 and has become one of the most active ransomware operations globally, with over 3,500 documented victims and a primary motivation of financial gain through extortion. The group is suspected to originate from Russia and operates as a Ransomware-as-a-Service (RaaS) model, recruiting affiliates to conduct attacks while providing them with ransomware tools, infrastructure, and support. LockBit primarily gains initial access through exploiting vulnerabilities in public-facing applications, credential stuffing attacks, and phishing campaigns, employing double extortion tactics where they steal sensitive data before encrypting systems and threatening to leak the information if ransom demands are not met. The group has demonstrated significant technical sophistication, developing multiple variants including LockBit 3.0 (also known as LockBit Black), and has been particularly active in targeting business services, manufacturing, technology, and healthcare sectors across the United States, France, Germany, United Kingdom, and Italy. Despite ongoing law enforcement efforts and international cooperation to disrupt their operations, including seizures of infrastructure and arrests of affiliates, LockBit has shown resilience and adaptability, continuing to operate and evolve their tactics while maintaining their position as one of the most dominant ransomware threats in the cybercriminal landscape. The group has been linked to 3,536 public disclosures across our corpus. First observed on a leak site on October 21, 2020; most recent post March 30, 2026. The operation is currently active.

Also tracked as: LockBit 3.0, LockBit Black, LockBit Green, ABCD ransomware.

Timeline of this disclosure

  • December 26, 2025cmc.com.br listed by LockBiton the group's public leak site

Other recent disclosures by LockBit

LockBit has been linked to 3,536 public victims on Darkfield. A sample of the most recent:

See the full LockBit dossier →

Sector and geography

Geographically, cmc.com.br is reported in Brazil, a country with 404 ransomware disclosures in our corpus.

If your organisation is affected

A listing by LockBit means cmc.com.br 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 LockBit'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.