Was kdynium.cz hit by ransomware?

kdynium.cz was listed by the ZaWoo 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 ZaWoo ransomware group?

ZaWoo 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 kdynium.cz breach?

ZaWoo published data attributed to kdynium.cz. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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KDYNIUM a.s.

listed as kdynium.cz · Claimed by ZaWoo · listed 21 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedAug 30, 2026
Data leakeddate unknown

At a glance

Group: ZaWoo
Status: Data leaked
Country: Czechia
Sector: Technology
Listed on leak site: Aug 30, 2026

About the victim

AI dossier — public-source company profile

KDYNIUM is a Czech precision casting foundry established in 1954. The company specializes in producing precise metal castings for industrial customers, offering services from modeling and mold creation through casting, finishing, and machining. They work with various alloys and serve clients across multiple industries requiring complex precision-cast components.

Industry: Precision Casting & Foundry Services
Founded: 1954

Attack summary

Severity: low — The leak post contains no substantive proof materials (no file counts, screenshots, or sample data visible), no detailed disclosure of what was compromised, and no evidence of encryption or operational disruption. The post appears to be a bare announcement without supporting evidence.

ZaWoo claims to have compromised KDYNIUM and published data. The leak post provides only a generic login prompt with no specific details about what was exfiltrated, encrypted, or the nature of the operational impact.

low

What the group claims

KDYNIUM a. s. is a Czech precision foundry based in Kdyně, Plzeň Region, specializing in precision castings made using the lost-wax (investment casting) process. The company says its foundry has been operating since 1954, while the current joint-stock company was incorporated in 1992.

The leak post

captured from the group's site

Please login to view files.
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Sources

Victim sitekdynium.cz
Leak posthttps://fyenuhkq3pfhnbpidj5jm2fl2lryxip4byhg6eozynrnlomu4szf2nyd.onion/index.html?indexId=bgfsdfhjydrju

Source

Indexed 21 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 ZaWoo

ZaWoo is a ransomware group first observed in August 2026 with an apparent financial motivation, having claimed at least 16 known victims across a relatively short operational window. The group's country of origin and potential affiliations with established threat actors or ransomware-as-a-service ecosystems have not been publicly attributed by CISA, the FBI, Mandiant, or other reputable security research organizations at this time, leaving its operational structure largely uncharacterized in open-source intelligence. Based on available victimology data, ZaWoo has demonstrated a targeting pattern favoring the Technology, Manufacturing, and Professional Services sectors, with additional intrusions recorded against Retail and E-Commerce entities, suggesting opportunistic selection of mid-market organizations likely to possess both sensitive data and financial resources sufficient to meet ransom demands. The group's geographic targeting has spanned Germany, Canada, Austria, Brazil, and the United States, indicating either a broad opportunistic reach or the use of access brokers supplying footholds across multiple regions. No specific tools, initial access vectors, encryption methods, or extortion tactics have been publicly documented for ZaWoo by authoritative sources, and no major high-profile campaigns, record ransom demands, or law enforcement actions against the group have been publicly recorded to date. Given its recent emergence and limited public profile, ZaWoo should be regarded as an emerging threat actor warranting continued monitoring, though definitive technical or attribution assessments remain pending further research and disclosure. The group has been linked to 16 public disclosures across our corpus. First observed on a leak site on August 30, 2026. The operation is currently active.

Timeline of this disclosure

August 30, 2026kdynium.cz listed by ZaWooon the group's public leak site

Other recent disclosures by ZaWoo

ZaWoo has been linked to 16 public victims on Darkfield. A sample of the most recent:

See the full ZaWoo dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,577 disclosures indexed across all operators we track. Geographically, kdynium.cz is reported in Czechia, a country with 16 ransomware disclosures in our corpus.

If your organisation is affected

A listing by ZaWoo means kdynium.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 ZaWoo'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.