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Asseco

Claimed by Hellcat · listed 1 year ago

15m
Age
since listed · data leaked

Status timeline

  1. ListedApr 5, 2025
  2. Data leakeddate unknown

At a glance

Group
Hellcat
Status
Data leaked
Country
Poland
Sector
Technology
Listed on leak site
Apr 5, 2025

About the victim

AI dossier — public-source company profile

Asseco Group is a major European software vendor operating in over 50 countries, specializing in enterprise IT solutions for banking, insurance, public administration, healthcare, utilities, and defense sectors. Listed on multiple stock exchanges (Warsaw, Tel-Aviv, NASDAQ), the company generates approximately 80% of revenue from proprietary software and ranks 6th among European software vendors.

Industry
Enterprise Software & IT Solutions
Address
Ul. Piastów 24, 87-100 Torum, Poland (headquarters inferred from phone number +48 17)
Employees
5000-10000
Founded
1981

Attack summary

Severity: critical — Large multinational software vendor with operations across critical sectors (banking, defense, government, healthcare) confirmed to have exfiltrated source code, financial records, and internal communications. The scale of potential downstream impact on clients in regulated industries and the nature of intellectual property theft warrants critical classification.

Hellcat claims to have breached Asseco's internal systems and exfiltrated sensitive files including communications, financial records, and source material. The group posted the announcement to their leak site indicating data publication.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • internal communications
  • financial records
  • source code/source material
  • sensitive files

What the group claims

Jiraware <<3 !! We have breached Asseco’s internal systems, stealing sensitive files, communications, financial records, and source material

Sources

Source

Indexed 1 year 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 Hellcat

Hellcat is a recently emerged ransomware group first observed in October 2024, operating with apparent financial motivations based on their targeting patterns across multiple high-value sectors. The group's origin and potential state affiliations remain unclear due to their recent emergence, though their broad geographic targeting spanning the United States, China, Germany, France, and Israel suggests either a sophisticated international operation or the use of ransomware-as-a-service infrastructure. Limited public documentation exists regarding Hellcat's specific attack methodologies, encryption techniques, or whether they employ double extortion tactics involving data exfiltration prior to encryption, as major cybersecurity firms and government agencies have yet to publish detailed technical analyses of their operations. With only 20 documented victims to date, the group has not yet conducted any widely publicized major campaigns or drawn significant law enforcement attention, though their targeting of technology, education, government, and business services sectors indicates a focus on organizations likely to possess valuable data and have strong incentives to pay ransoms. Hellcat remains active as of current reporting, though their limited operational footprint and recent emergence make long-term assessment of their capabilities and persistence difficult to determine. The group has been linked to 20 public disclosures across our corpus. First observed on a leak site on October 25, 2024; most recent post April 10, 2025. The operation is currently inactive.

Timeline of this disclosure

  • April 5, 2025Asseco listed by Hellcaton the group's public leak site

Other recent disclosures by Hellcat

Hellcat has been linked to 20 public victims on Darkfield. A sample of the most recent:

See the full Hellcat dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,549 disclosures indexed across all operators we track. Geographically, Asseco is reported in Poland, a country with 49 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Hellcat means Asseco 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 Polska (Poland), as required for your jurisdiction.
  • Monitor for the data appearing on Hellcat'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.