Was jastrebarsko.hr hit by ransomware?

jastrebarsko.hr was listed by the Threeam 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 Threeam ransomware group?

Threeam 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 jastrebarsko.hr breach?

Threeam published data attributed to jastrebarsko.hr. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Town of Jastrebarsko

listed as jastrebarsko.hr · Claimed by Threeam · listed 19 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedJun 12, 2026
Data leakeddate unknown

At a glance

Group: Threeam
Status: Data leaked
Country: Croatia
Listed on leak site: Jun 12, 2026

About the victim

AI dossier — public-source company profile

Jastrebarsko is a historic municipality in Central Croatia, located between Zagreb and Karlovac. It operates as a local government entity providing public services, urban planning, cultural heritage management, and community development to its residents.

Industry: Local Government / Public Administration
Address: Jastrebarsko, Central Croatia (between Zagreb and Karlovac)

Attack summary

Severity: low — The leak post contains only a basic announcement with no technical details, no proof files or screenshots advertised, no specifics on data exfiltration or operational impact, and no ransom demand. The disclosure is minimal.

The threeam group claims to have compromised the Town of Jastrebarsko's systems. The leak post does not specify whether data was exfiltrated, encrypted, or both, nor does it detail what specific data categories are at stake.

low

What the group claims

Town of Jastrebarsko, a historic city in Central Croatia located between Zagreb and Karlovac.

Sources

Source

Indexed 19 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 Threeam

Threeam is a financially motivated ransomware group that emerged in September 2023, operating as a relatively new player in the ransomware ecosystem with 64 documented victims across multiple countries and sectors. The group's origin and potential affiliations remain unclear due to limited public documentation from major security agencies, though their targeting patterns suggest a broad opportunistic approach rather than nation-state backing. Based on available victim data, Threeam appears to employ common initial access vectors targeting organizations across business services, healthcare, manufacturing, and technology sectors, with the United States, United Kingdom, Australia, France, and Brazil representing their primary geographic focus areas. While specific technical details about their encryption methods and extortion tactics have not been extensively documented by major threat intelligence firms, their emergence in late 2023 and victim count suggests they have established operational capabilities within the competitive ransomware landscape. The group's current operational status remains active based on the recency of their emergence, though detailed law enforcement actions or disruption efforts have not been publicly reported by CISA, FBI, or other major security organizations. The group has been linked to 85 public disclosures across our corpus. First observed on a leak site on September 14, 2023; most recent post June 12, 2026. The operation is currently inactive.

Timeline of this disclosure

June 12, 2026jastrebarsko.hr listed by Threeamon the group's public leak site

Other recent disclosures by Threeam

Threeam has been linked to 85 public victims on Darkfield. A sample of the most recent:

See the full Threeam dossier →

Sector and geography

Geographically, jastrebarsko.hr is reported in Croatia, a country with 2 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Threeam means jastrebarsko.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 Threeam'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.