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 252 public disclosures across our corpus. First observed on a leak site on December 7, 2025; most recent post May 12, 2026. The operation is currently active.

Timeline of this disclosure

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

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, zsfh.cz is reported in CZ, a country with 5 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

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Základní škola a Mateřská škola F. Hrubína Havířov-Podlesí

listed as zsfh.cz · Claimed by lockbit5 · listed 1 month ago

36d

Age

since listed · data leaked

Status timeline

Listed
Apr 14, 2026
Data leaked

At a glance

Group: lockbit5
Status: Data leaked
Country: CZ
Sector: Not Found
Listed on leak site: Apr 14, 2026

About the victim

AI dossier — public-source company profile

Základní škola a Mateřská škola F. Hrubína Havířov-Podlesí is a public primary school and kindergarten (příspěvková organizace) established and funded by the statutory city of Havířov, in the Podlesí district of the Czech Republic. The institution provides elementary and pre-school education and operates multiple facilities including a school canteen, after-school club, and counselling services.

Industry: Primary & Pre-School Education (Public)
Address: Havířov-Podlesí, Czech Republic

Attack summary

Severity: high — Data has been published (not merely listed), and the victim is a public school holding PII of minors (students), parents, and staff — constituting regulated personal data under GDPR. Exposure of children's data elevates severity to high.

LockBit 5 claims to have attacked the school and has published data (disclosed status: data_published), indicating exfiltration of school records. No ransom amount or specific data volume has been stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Student personal records
Staff/teacher personal data
Parent contact information
Administrative documents
Financial/budgetary records
School counselling records

What the group claims