Gfeller Treuhand und Verwaltungs
● Listed in the last 48hAbout the organisation
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.
What the listing means
Gfeller Treuhand und Verwaltungs appeared on the thegentlemen leak site on 14 August 2026. Groups publish a victim once negotiations stall or as pressure during them, so a listing usually means data was already exfiltrated. This group has published 155 claims in the last 30 days and remains active.
Recommended actions
- Treat any unsolicited message referencing Gfeller Treuhand und Verwaltungs as suspicious — leaked data gets weaponised for phishing within days.
- If you hold an account on gfeller-treuhand.ch, change that password now, update it anywhere you reused it, and enable two-factor authentication.
- Other Professional Services organisations should review this group's known TTPs and validate detection coverage against them.
- Watch for follow-on extortion: stolen data is often re-leaked or resold after the initial listing.
- A leak-site listing is a claim made by the attacker, not a confirmed breach — check the organisation's own disclosures before acting on it.
Leak-site evidence
Listing URL https://www.ransomware.live/id/R2ZlbGxlciBUcmV1aGFuZCB1bmQgVmVyd2FsdHVuZ3NAdGhlZ2VudGxlbWV...