Was mesto-jemnice.cz hit by ransomware?

mesto-jemnice.cz was listed by the lockbit5 ransomware operation (Czechia), 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 lockbit5 ransomware group?

lockbit5 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 mesto-jemnice.cz breach?

lockbit5 published data attributed to mesto-jemnice.cz. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Město Jemnice (City of Jemnice)

listed as mesto-jemnice.cz · Claimed by Lockbit5 · listed 2 months ago

Age

since listed · data leaked

Status timeline

ListedApr 14, 2026
Data leakeddate unknown

At a glance

Group: Lockbit5
Status: Data leaked
Country: Czechia
Sector: Public Sector
Listed on leak site: Apr 14, 2026

About the victim

AI dossier — public-source company profile

Město Jemnice is the official municipal authority of Jemnice, a small town in the South Moravian/Vysočina region of the Czech Republic. It serves as the administrative, economic, and cultural centre of the local area, operating a city council, municipal office with multiple departments, social services, and public infrastructure projects. The municipality publishes official documents, manages public procurement, and provides citizen services through its official web portal.

Industry: Municipal Government Administration
Address: Město Jemnice, Náměstí Jemnice, Jemnice, Czech Republic

Attack summary

Severity: high — Data has been published (disclosed status: data_published) by a ransomware group targeting a public-sector municipal authority. Municipal systems typically hold PII of residents, financial records, and social services data, making exfiltration and publication a significant breach of regulated personal data under GDPR in the Czech Republic.

LockBit 5 claims to have attacked the City of Jemnice municipality, with data listed as published ('data_published'), suggesting exfiltration and public release of data obtained from the municipal administration systems. No ransom amount was stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Municipal administrative documents
City council resolutions and minutes
Budget and financial records
Public procurement contracts
Citizen services data
Social services records
Personal data of residents (potential)

What the group claims

Historie města Jemnice Město Jemnice je správním, hospodářským a kulturním střediskem kraje mezi Da...

Sources

Source

Indexed 2 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 lockbit5

Based on the provided data, LockBit5 appears to be a recently emerged ransomware operation first observed in December 2025, representing what may be a new iteration or rebrand within the LockBit ransomware ecosystem, with primary financial motivations evidenced by their targeting of high-value sectors. Given the LockBit naming convention and the timing of emergence, this group likely operates from Eastern Europe or Russia and may represent either a continuation of previous LockBit operations or a new affiliate group leveraging the established LockBit brand, though specific organizational details remain undocumented by major security agencies. While detailed attack methodologies have not been publicly documented by CISA, FBI, or major security researchers, the group's targeting pattern across 157 victims suggests a broad-spectrum approach focusing on technology, manufacturing, healthcare, and transportation sectors primarily in the United States, Brazil, Germany, Italy, and Mexico. Due to the group's recent emergence in December 2025, there are no publicly documented notable campaigns or major incidents reported by established threat intelligence sources, though the victim count indicates active operations. The group appears to be currently active based on the recent first observation date, though comprehensive analysis from major security agencies has not yet been published given the short timeframe since emergence. The group has been linked to 278 public disclosures across our corpus. First observed on a leak site on December 7, 2025; most recent post June 11, 2026. The operation is currently active.

Timeline of this disclosure

April 14, 2026mesto-jemnice.cz listed by lockbit5on the group's public leak site

Other recent disclosures by lockbit5

lockbit5 has been linked to 278 public victims on Darkfield. A sample of the most recent:

See the full lockbit5 dossier →

Sector and geography

This disclosure adds to ransomware activity in the Public Sector sector, which has 260 disclosures indexed across all operators we track. Geographically, mesto-jemnice.cz is reported in Czechia, a country with 5 ransomware disclosures in our corpus.

If your organisation is affected

A listing by lockbit5 means mesto-jemnice.cz 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 lockbit5'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.