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Yulkok Ltd

beast

This record tracks a ransomware attack claimed by the beast group against Yulkok Ltd. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.

Window Zero

EXPOSURE GAP

Window Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.

219days open
t1 · Published t2 · Pending
Feb 05, 2026Not disclosed yet
Country
Korea, Republic of
Business Category
Manufacturing / Engineering
Employees
+1000
Discovered
2026-02-05
Published
February 05, 2026
Leak Status
leaked
checked 2026-09-05
Disclosed / Notified
Not disclosed yet
Victim ID
2Tcr56GTa64Z

Attack Summary

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.

Leak Screenshots

14 CAPTURED

Captured directly from the operator's leak site by our collector, last checked 2026-09-05. Verdict evidence: [H5] data size: 200GB links=http://isnunjmt7nvxwe2q2xvynntrqfjga7qpywiwtol4rmyoycwrccjezcad.onion

Leak site capture 2026-09-05
2026-09-05

Proof files published by the operator — 13 image(s) harvested from this entry. Content is locked; type and dimensions shown.

Spreadsheet
File listing
Document
Document
Document
Document
Document
File listing
Document
File listing
Image, little text
File listing
Image, little text

Capture history — 2 day(s) tracked. Content is locked.

2026-09-05
2026-09-05
Showing the latest capture only
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Dark Web Exposure

Findings for yulkok.com — indexed by HaveIBeenRansom.
0
found in Infostealer logs
1
found in Traditional breaches
0
found in Ransomware leaks
VerificationsIO_BF.7z.011
Kedr | Forum 🪾 · breach
••• emails
Leak volumes are locked
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