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Thialf

thegentlemen

This record tracks a ransomware attack claimed by the thegentlemen group against Thialf. 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.

48days open
t1 · Published t2 · Pending
Jul 23, 2026Not disclosed yet
Country
Netherlands
Business Category
Construction / Real Estate
Employees
101-1000
Discovered
2026-07-23
Published
July 23, 2026
Disclosed / Notified
Not disclosed yet
Victim ID
bGiNTzAv7rnb

Attack Summary

***.nl zoominfo.com/c/thialf/430686423 Thialf is a world-renowned ice arena located in Heerenveen, Netherlands, often referred to as the "Cathedral of Speed Skating." It serves as the home base for the Dutch national speed skating team and hosts a wide range of ice sports, including long track and short track speed skating, figure skating, and ice hockey. Recently, it was officially confirmed as the long-track speed skating venue for the 2030 Winter Olympics. The facility is celebrated for its modern, sustainable design and its role as a major hub for both elite professional competitions and public recreational skating.

Leak Screenshots

SAMPLE

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file_tree.png
finance_2024.xlsx
passport_scan.jpg
contract_signed.pdf
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Dark Web Exposure

Findings for thialf.nl — indexed by HaveIBeenRansom.
3
found in Infostealer logs
25
found in Traditional breaches
1
found in Ransomware leaks
linkedIN_2.7z.001
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Untitled leak
— · breach
••• emails
Instagram.rar
Formaceft db · breach
••• emails
B F R e p o V 3 F i l e s · breach
••• emails
B F R e p o V 3 F i l e s · breach
••• emails
Misha-z88 DB · breach
••• emails
+ 4 more leak sources locked
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