Was CPTM hit by ransomware?

CPTM was listed by the Blackbyte 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 Blackbyte ransomware group?

Blackbyte 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 CPTM breach?

Blackbyte published data attributed to CPTM. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Companhia Paulista de Trens Metropolitanos (CPTM)

listed as CPTM · Claimed by Blackbyte · listed 4 years ago

43m

Age

since listed · data leaked

Status timeline

ListedDec 29, 2022
Data leakeddate unknown

At a glance

Group: Blackbyte
Status: Data leaked
Country: Brazil
Sector: Transportation & Logistics
Listed on leak site: Dec 29, 2022

About the victim

AI dossier — public-source company profile

CPTM (Companhia Paulista de Trens Metropolitanos) is a state-owned commuter rail operator under the Secretariat of Urban Transportation of the State of São Paulo, Brazil. Created in 1992 through the merger of several railways, it operates a metropolitan rail network serving Greater São Paulo across 97 stations and approximately 2.5 million daily passengers.

Industry: Public Commuter Rail Transit
Address: São Paulo, SP, Brazil
Founded: 1992

Attack summary

Severity: critical — CPTM is a state-owned public transit operator serving ~2.5 million daily passengers; it is critical infrastructure. Data_published status confirms exfiltration. A breach of a government-owned rail operator likely involves PII of employees and potentially passengers, as well as sensitive operational and infrastructure data.

Blackbyte claims to have attacked CPTM and has published data ('data_published' status), suggesting confirmed exfiltration of company data. No specific ransom amount or data size was stated in the post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Internal corporate documents
Government/public-sector operational data
Potentially employee and HR records
Potentially citizen/passenger data

What the group claims

The São Paulo Metropolitan Train Company is a commuter rail system owned by the Secretariat of Urban Transportation of the State of São Paulo. It was created in 1992 with the merger of several railways in Greater São Paulo, Brazil.

Sources

Victim sitecptm.sp.gov.br/

Source

Indexed 4 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 Blackbyte

BlackByte is a ransomware-as-a-service (RaaS) operation that emerged in October 2021, primarily motivated by financial gain through double extortion tactics targeting organizations across multiple sectors. The group is suspected to operate from Russia or former Soviet states based on their use of Russian-language forums and avoidance of targeting organizations in Commonwealth of Independent States countries, though they maintain no confirmed links to other established ransomware families. BlackByte operators typically gain initial access through vulnerable Microsoft Exchange servers, phishing campaigns, and exploitation of remote desktop protocol (RDP) services, employing tools such as Cobalt Strike for lateral movement and data exfiltration before deploying their custom ransomware payload that uses AES-256 encryption with RSA-2048 key protection. The group has demonstrated particular focus on critical infrastructure sectors, with the FBI and CISA issuing joint advisories in February 2022 highlighting attacks against organizations in government, healthcare, manufacturing, and education sectors, including notable incidents affecting San Francisco's transportation authority and multiple healthcare systems across the United States. BlackByte remains active as of 2024, continuing to evolve their tactics and maintain their leak site for publishing stolen data from victims who refuse to pay ransoms. The group has been linked to 147 public disclosures across our corpus. First observed on a leak site on October 4, 2021; most recent post July 30, 2025. The operation is currently inactive.

Timeline of this disclosure

December 29, 2022CPTM listed by Blackbyteon the group's public leak site

Other recent disclosures by Blackbyte

Blackbyte has been linked to 147 public victims on Darkfield. A sample of the most recent:

See the full Blackbyte dossier →

Sector and geography

This disclosure adds to ransomware activity in the Transportation & Logistics sector, which has 180 disclosures indexed across all operators we track. Geographically, CPTM is reported in Brazil, a country with 404 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Blackbyte means CPTM 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 Blackbyte'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.