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Gfeller Treuhand und Verwaltungs

thegentlemen

This record tracks a ransomware attack claimed by the thegentlemen group against Gfeller Treuhand und Verwaltungs. 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.

23days open
t1 · Published t2 · Pending
Aug 13, 2026Not disclosed yet
Country
Switzerland
Discovered
2026-08-14
Published
August 13, 2026
Disclosed / Notified
Not disclosed yet
Victim ID
CBTHJCvEo9dN

Attack Summary

gfeller-treuhand.ch zoominfo.com/c/gfeller-treuhand-und-verwaltungs-ag/372661395 Gfeller Treuhand und Verwaltungs AG is a Swiss real estate and fiduciary company based in Dübendorf, operating since 1980. They specialize in comprehensive property management, real estate sales, and leasing services. The firm provides professional administrative support, utilizing modern IT solutions to efficiently handle property maintenance and tenant relations.

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 gfeller-treuhand.ch — indexed by HaveIBeenRansom.
0
found in Infostealer logs
14
found in Traditional breaches
0
found in Ransomware leaks
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VerificationsIO_BF.7z.011
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ANTIPUBLIC #1.tar.zip.001
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••• emails
Ronorp_Dump.rar
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••• emails
MySpace_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
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••• emails
LKnet reserve chat · breach
••• emails
Misha-z88 DB · breach
••• emails
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