Yulkok Ltd
bd_a59ec18d83713a17 · schema v1 · pii pii-v1
Full breach record for Yulkok Ltd →Threat-actor claim — not a regulatory filing
This row is a claim by the ransomware group Beast on its public extortion blog. It has not been validated by the victim or any regulator. Treat attribution and counts as the threat actor's assertion until a regulatory filing or victim disclosure corroborates them.
Source: Ransomware.live
Post text · scraped from the leak site
Yulkok Ltd. (South Korea) 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.
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Incident timeline — mostly unverified
? — ?
Breach window unknown
Feb 5, 2026
Claim posted
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No filing yet · watching
Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.
Claim → filing
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Compliance clock
Not assessable
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.
No regulatory filing corroborates this yet — it is the attacker's own assertion. Watch this entity to be notified the moment a filing corroborates or contradicts it.
Source ceiling
- actor name
- victim claim
- ransom/leak status
- discovery date
- materiality
- notification
- affected count
- confirmed data types
- compliance clock
The ✕ fields stay blank until a regulatory filing or victim disclosure lands.
beast
According to ransomware.live, Beast is a Ransomware-as-a-service (RaaS) product which provides functionality such as SMB scanning, file encryption, service and process starting and stopping, and geographic identification to avoid encryption in CIS countries.