Who is the beast ransomware group?

beast is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

Ransomware victim disclosure

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Korea Aerospace Industries (KAI) supplier / Changwon aerospace manufacturer

Q: What data was leaked in the Korea Aerospace Industries (KAI) supplier / Changwon aerospace manufacturer breach?

beast published data attributed to Korea Aerospace Industries (KAI) supplier / Changwon aerospace manufacturer. Darkfield captured the leak post and a screenshot of the listing.

Claimed by Beast · listed 3 months ago

Age

since listed · data leaked

Status timeline

ListedMay 29, 2026
Data leakeddate unknown

At a glance

Group: Beast
Status: Data leaked
Country: South Korea
Sector: Aerospace & Defense Manufacturing
Listed on leak site: May 29, 2026

About the victim

AI dossier — public-source company profile

A Changwon-based aerospace manufacturer specializing in high-precision 5-axis CNC metal machining and fuselage component assembly. Founded in 1990, the company supplies critical parts to global aerospace primes including Boeing, Airbus, and Korea Aerospace Industries (KAI) for military aircraft production such as the T-50 and FA-50.

Industry: Aerospace & Defense Manufacturing
Address: Changwon, South Korea
Founded: 1990

Attack summary

Severity: critical — Confirmed data exfiltration from a defense contractor supplying military aircraft components to KAI and global aerospace primes. Exposure of manufacturing specs, designs, or operational data poses direct national security and supply-chain integrity risks.

The Beast group claims to have exfiltrated data from this aerospace supplier. The leak post indicates data has been published, though specific details on the scope and nature of exfiltrated files are not provided in the available excerpt.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Manufacturing specifications
Technical drawings
Customer/partner contracts
Operational data

What the group claims

A major global player headquartered in Changwon, South Korea, founded in 1990. Specializes in manufacturing high-precision parts and assemblies for the aerospace industry, including 5-axis CNC metal machining and fuselage component assembly. Collaborates with Boeing, Airbus, and Korea Aerospace Industries (KAI) for the production of military aircraft such as the T-50 and FA-50.

The leak post

captured from the group's site

This is a major global player with the same name.
Operations: Manufacturing high-precision parts and assemblies for the aerospace industry.
Specialization: 5-axis CNC metal machining, fuselage component assembly.
Partners: Collaborates with global giants such as Boeing and Airbus, as well as Korea Aerospace Industries (KAI) for the production of military aircraft (e.g., T-50, FA-50).
Location: Headquartered in Changwon, South Korea; founded in 1990.
P U B L I S H E D

Screenshot of the leak post

Leak screenshot for Korea Aerospace Industries (KAI) supplier / Changwon aerospace manufacturer

Sources

Leak posthttp://beast6azu4f7fxjakiayhnssybibsgjnmy77a6duufqw5afjzfjhzuqd.onion/card/yulkok_ltd

Source

Indexed 3 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 beast

The Beast ransomware group is a relatively new threat actor that emerged in July 2025, operating with apparent financial motivations through their ransomware campaigns. With limited public documentation available from major security agencies, the group has demonstrated activity primarily targeting victims across the United States, United Kingdom, Brazil, South Korea, and Argentina, accumulating approximately 65 known victims since their emergence. Their targeting pattern shows a focus on healthcare organizations, manufacturing companies, educational institutions, and construction firms, suggesting an opportunistic approach rather than highly specialized sector expertise. The group's recent emergence means there is insufficient public intelligence from CISA, FBI, Mandiant, or other established security researchers regarding their specific attack methodologies, initial access vectors, or technical capabilities. Given the timeline of their first observation in mid-2025, Beast represents an active and emerging threat with their current operational status remaining unclear due to limited threat intelligence reporting from authoritative sources. The group has been linked to 106 public disclosures across our corpus. First observed on a leak site on July 29, 2025; most recent post August 25, 2026. The operation is currently active.

Timeline of this disclosure

May 29, 2026Korea Aerospace Industries (KAI) supplier / Changwon aerospace manufacturer listed by beaston the group's public leak site

Other recent disclosures by beast

beast has been linked to 106 public victims on Darkfield. A sample of the most recent:

See the full beast dossier →

Sector and geography

This disclosure adds to ransomware activity in the Aerospace & Defense Manufacturing sector. Geographically, Korea Aerospace Industries (KAI) supplier / Changwon aerospace manufacturer is reported in South Korea, a country with 48 ransomware disclosures in our corpus.

If your organisation is affected

A listing by beast means Korea Aerospace Industries (KAI) supplier / Changwon aerospace manufacturer 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.
Report the incident to your national CERT, KrCERT/CC (South Korea), as required for your jurisdiction.
Monitor for the data appearing on beast'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.