Was TransUnion hit by ransomware?

TransUnion was listed by the Hunters International ransomware operation (United States), 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 Hunters International ransomware group?

Hunters International 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 TransUnion breach?

Hunters International published data attributed to TransUnion. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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TransUnion

Claimed by Hunters International · listed 9 months ago

Age

since listed · data leaked

Status timeline

ListedOct 3, 2025
Data leakeddate unknown

At a glance

Group: Hunters International
Status: Data leaked
Country: United States
Sector: Financial Services
Listed on leak site: Oct 3, 2025

About the victim

AI dossier — public-source company profile

TransUnion is one of the three major consumer credit reporting agencies in the United States, headquartered in Chicago, Illinois. It collects and aggregates credit history, scoring, and personal data on over one billion consumers across more than 30 countries. The company provides credit information, risk assessment, and analytics services to businesses and individual consumers globally.

Industry: Credit Reporting & Consumer Analytics
Address: 555 W Adams St, Chicago, IL 60661, United States
Employees: 10000+
Founded: 1968

Attack summary

Severity: critical — TransUnion holds regulated financial and personal data on over one billion consumers globally; any confirmed exfiltration of such records constitutes a critical-scale breach of highly sensitive PII and financial data subject to multiple regulatory frameworks.

Hunters International claims to have attacked TransUnion and has published data, though the leak post does not specify whether encryption or exfiltration occurred; the disclosed status of 'data_published' indicates exfiltrated data has been released.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Credit history records
Credit scores
Personally identifiable information (PII)
Consumer financial data
Personal information protection service records

Original description

AI-summarised, not from the leak post

TransUnion is a global credit reporting agency that provides credit information and analytics services to businesses and individual consumers. It collects and aggregates information on over a billion individual consumers in over thirty countries including "Big Three" credit-reporting agencies in the United States. The data they handle includes credit history, credit scoring, and personal information protection services.

Source

Indexed 9 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 Hunters International

Hunters International is a ransomware group that emerged in October 2023, operating with primarily financial motivations and demonstrating rapid expansion in their victim targeting across multiple sectors. The group's origin and specific affiliations remain largely undocumented by major security agencies, though their operational patterns suggest they function as an independent ransomware operation rather than a established Ransomware-as-a-Service model. Based on publicly available victim data, Hunters International has demonstrated a preference for targeting business services, technology, and manufacturing sectors, with their attacks primarily concentrated in English-speaking countries including the United States, France, and the United Kingdom. Their attack methodology and specific technical capabilities have not been extensively documented by major threat intelligence organizations such as CISA, FBI, or Mandiant, limiting detailed analysis of their initial access vectors, encryption methods, or data exfiltration practices. With 388 documented victims since their emergence, the group has shown consistent activity levels, though specific high-profile campaigns or notable ransom demands have not been widely reported in public threat intelligence reports. As of current reporting, Hunters International appears to remain active with no documented law enforcement disruptions or operational changes reported by major cybersecurity agencies. The group has been linked to 695 public disclosures across our corpus. First observed on a leak site on October 20, 2023; most recent post March 26, 2026. The operation is currently active.

Also tracked as: Hunters.

Timeline of this disclosure

October 3, 2025TransUnion listed by Hunters Internationalon the group's public leak site

Other recent disclosures by Hunters International

Hunters International has been linked to 695 public victims on Darkfield. A sample of the most recent:

See the full Hunters International dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,184 disclosures indexed across all operators we track. Geographically, TransUnion is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Hunters International means TransUnion 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, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on Hunters International'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.