This record tracks a ransomware attack claimed by the
clop group against
BELFUSE.COM. 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.
-63days
t1 · Published
t2 · Disclosed
Business Category
Communication / Marketing
Published
November 21, 2025
Disclosed / Notified
Sep 20, 2025
Attack Summary
[AI generated] Bel Fuse Inc. is a leading global manufacturer of products that power, protect and connect electronic circuits. Founded in 1949, the company offers an array of products including magnetic solutions, power transformers, circuit protection connectors, and power conversion products. These products are used in industries such as computing, telecommunication, automotive and aerospace. Bel Fuse operates from numerous locations across America, Europe, and Asia.
Leak Screenshots
SAMPLE
Proof-of-breach screenshots the operator posted from the stolen data. Previews are
redacted and locked — the originals are available on HaveIBeenRansom.
Dark Web Exposure
Findings for belfuse.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
1,116+
found in Traditional breaches
90+
found in Ransomware leaks
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+ 17 more leak sources locked
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Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house does not acquire, download, host, access or redistribute unlawfully obtained data. It indexes only publicly visible information posted by ransomware, breach and infostealer operators and open web sources, without accessing the underlying stolen content. The service supports public awareness, legitimate research and cyber-resilience.