Was kbc-zagreb.hr hit by ransomware?

kbc-zagreb.hr was listed by the lockbit3 ransomware operation (Croatia), 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 lockbit3 ransomware group?

lockbit3 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 kbc-zagreb.hr breach?

lockbit3 published data attributed to kbc-zagreb.hr. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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KBC Zagreb

listed as kbc-zagreb.hr · Claimed by Lockbit3 · listed 2 years ago

$500M

Ransom

demanded

23m

Age

since listed · data leaked

Status timeline

ListedJul 1, 2024
Data leakeddate unknown

At a glance

Group: Lockbit3
Status: Data leaked
Country: Croatia
Sector: Healthcare
Listed on leak site: Jul 1, 2024
Ransom demanded: $500M

About the victim

AI dossier — public-source company profile

KBC Zagreb is a major hospital and health care operator in Croatia serving 2,001–5,000 employees with annual revenue in the $500M–$1B range. The organization provides comprehensive medical services including surgery, organ transplantation, and patient care.

Industry: Hospital & Health Care
Employees: 2001-5000

Attack summary

Severity: critical — Confirmed exfiltration of regulated medical data at scale (PII, patient health records, organ transplant data) from a major health care institution serving thousands of patients; GDPR and health privacy regulations apply.

LockBit3 claims to have exfiltrated medical records, patient examination data, research papers, and organ/donor transplant information from KBC Zagreb's systems.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Medical records
Patient exam and study data
Doctors' research papers
Surgery and organ transplant records
Donor data

What the group claims

KBC Zagreb is a company that operates in the Hospital & Health Care industry. It employs 2,001-5,000 people and has $500M-$1B of revenue. we have: Medical records, patient exams and studies; doctors' research papers; surgery, organ and donor data...

Sources

Victim sitekbc-zagreb.hr
Leak posthttp://lockbit3753ekiocyo5epmpy6klmejchjtzddoekjlnt6mu3qh4de2id.onion//post/40ZvogB5UmXS7vun6682987077e5e

Source

Indexed 2 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 lockbit3

LockBit 3.0, also known as LockBit Black, is a prominent ransomware-as-a-service operation that emerged in June 2022 as the third major iteration of the LockBit ransomware family, operating with primarily financial motivations and becoming one of the most prolific ransomware groups globally. The group is believed to operate from Russia or former Soviet states, functioning as a sophisticated RaaS platform that recruits affiliates to conduct attacks while the core group maintains the ransomware infrastructure and negotiates with victims. LockBit 3.0 employs multiple initial access vectors including exploitation of remote desktop protocols, vulnerable VPN appliances, and phishing campaigns, utilizing a fast-encrypting ransomware payload that can complete network-wide encryption in minutes while implementing triple extortion tactics that include data theft, encryption, and threats to leak stolen information on their dedicated leak site called "LockBit Black Blog." The group has claimed responsibility for attacks against thousands of organizations worldwide, with notable victims including major corporations and critical infrastructure entities across their primary target countries of the United States, France, United Kingdom, Germany, and Italy, focusing heavily on business services, technology, manufacturing, healthcare, and government sectors. Despite law enforcement disruptions including Operation Cronos in February 2024 which temporarily seized their infrastructure and websites, LockBit has demonstrated resilience by quickly rebuilding their operations and continuing to recruit new affiliates and victims. The group has been linked to 2,016 public disclosures across our corpus. First observed on a leak site on June 29, 2022; most recent post December 5, 2025. The operation is currently active.

Timeline of this disclosure

July 1, 2024kbc-zagreb.hr listed by lockbit3on the group's public leak site

Ransom demanded: $500M

Other recent disclosures by lockbit3

lockbit3 has been linked to 2,016 public victims on Darkfield. A sample of the most recent:

See the full lockbit3 dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,593 disclosures indexed across all operators we track. Geographically, kbc-zagreb.hr is reported in Croatia, a country with 3 ransomware disclosures in our corpus.

If your organisation is affected

A listing by lockbit3 means kbc-zagreb.hr 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.
Monitor for the data appearing on lockbit3'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.