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Prefeitura Municipal de Cássia, Minas Gerais

listed as Cássias MG Government (CASSIAS.MG.GOV) · Claimed by Emperador · listed 3 hours ago

Today
Age
since listed · negotiating

Status timeline

  1. ListedSep 22, 2026

Current state: Negotiating

At a glance

Group
Emperador
Status
Negotiating
Country
Brazil
Sector
Government
Listed on leak site
Sep 22, 2026

About the victim

AI dossier — public-source company profile

Cássia is a municipality in Minas Gerais state, Brazil, governed through its municipal administration (prefeitura). The organization operates government services including health (SUS), civil registry, financial management, and police coordination at the local level.

Industry
Local Government Administration
Address
Cássia, Minas Gerais, Brazil

Attack summary

Severity: critical — Confirmed exfiltration of government credentials and at-scale PII including medical records, national IDs, birth certificates, and CPF numbers (Brazil's primary identity/tax document). Access to justice panels and financial sector credentials indicates systemic compromise of critical government infrastructure. Data involves Brazilian citizens' sensitive personal and health information.

Emperador claims to have exfiltrated government credentials, justice system access panels, financial sector access, police data, and personally identifiable information including medical records (SUS), national ID documents (RG/CIN), birth certificates, and CPF (Brazilian tax ID/identity numbers). The group states it is negotiating with the victim and has published sample proof files.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Government credentials
  • Justice system access panels
  • Financial sector access credentials
  • Police data
  • Medical records (SUS)
  • National ID documents (RG/CIN)
  • Birth certificates
  • CPF (Brazilian tax ID/identity numbers)
  • Municipal financial records

The group's post references roughly 2 proof files proof files.

What the group claims

Brazilian municipal government of Cássia, MG. Attackers claim access to government credentials, justice panels, financial sector, police, personal data, medical (SUS), RG (CIN), birth certificates, CPF (Brazilian identity numbers), and data from CASSIAS.MG.GOV departments.

The leak post

captured from the group's site
network commitment, from government credentials to justice panels, such as access to the financial sector, police, personal data, medical (SUS), RG(CIN), BIRTH CERTIFICATE, CPF (identity number in Brazil) among other data from CASSIAS.MG.GOV departments, we will give you a deadline to negotiate with us!
[UBS TIPO I CÁSSIA-UBS 1 CÁSSIA.pdf](http://emprdr4p7iwlhpky33tswt3k2qdeljyjcdpoysabudmmrz4z32laexad.onion/post/cassias-mg-government/sample/24/)
[Débitos Agrupados por Origem de Lançamento_2026-09-04_17_02_47 (1).pdf](http://emprdr4p7iwlhpky33tswt3k2qdeljyjcdpoysabudmmrz4z32laexad.onion/post/cassias-mg-government/sample/25/)

Data the group says was taken

  • government credentials
  • financial records
  • police data
  • personal data
  • medical records
  • RG/CIN
  • birth certificates
  • CPF

Screenshot of the leak post

Leak screenshot for Cássias MG Government (CASSIAS.MG.GOV)

Sources

Source

Indexed 3 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 emperador

Emperador is a ransomware group first observed in August 2026 with an apparent financial motivation, though its limited operational history makes comprehensive attribution difficult at this time. Based on available data, the group has recorded at least one confirmed victim, with targeting concentrated in the Philippines and a demonstrated focus on the Government and Defense sector, suggesting either opportunistic targeting or a deliberate interest in sensitive public-sector data. Specific details regarding initial access vectors, encryption methodologies, and tooling have not been publicly documented by CISA, the FBI, Mandiant, or other reputable threat intelligence sources as of this profile's compilation, and no affiliation with known ransomware-as-a-service ecosystems or established threat actor clusters has been formally established. No notable high-profile campaigns, record ransom demands, or law enforcement actions have been publicly attributed to this group, which is consistent with its nascent operational timeline and minimal victim count. Given its very recent emergence and limited observed activity, Emperador should be considered an emerging and uncharacterized threat requiring continued monitoring, particularly by organizations operating within Philippine government and defense environments. The group has been linked to 40 public disclosures across our corpus. First observed on a leak site on August 12, 2026; most recent post September 22, 2026. The operation is currently active.

Timeline of this disclosure

  • September 22, 2026Cássias MG Government (CASSIAS.MG.GOV) listed by emperador on the group's public leak site

Other recent disclosures by emperador

emperador has been linked to 40 public victims on Darkfield. A sample of the most recent:

See the full emperador dossier →

Sector and geography

This disclosure adds to ransomware activity in the Government sector, which has 685 disclosures indexed across all operators we track. Geographically, Cássias MG Government (CASSIAS.MG.GOV) is reported in Brazil, a country with 404 ransomware disclosures in our corpus.

If your organisation is affected

A listing by emperador means Cássias MG Government (CASSIAS.MG.GOV) appeared on a ransomware extortion site and is being pressured to pay before any publication. 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 emperador'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.