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.
284days open
t1 · Published
t2 · Pending
Business Category
Communication / Marketing
Published
November 21, 2025
Disclosed / Notified
Not disclosed yet
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
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What's In This Leak
Composition analysis from Have I Been Ransom · ransomware leak.
YES
Identity documents present
csv
705,863
records · 23 files
txt
588
records · 33 files
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records · ••••• files
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records · ••••• files
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••••••••
records · ••••• files
Identity documents
••••
••% of records
Full composition is locked
Unlock the remaining 3 file type(s), the corporate vs personal email split and the identity-document analysis.
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
pureincubation-com.7z.001
Database World ROC · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
Televerde
play · ransomware
••• emails
limeleads_breach.7z
TheUnderground - Reborn · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
B F R e p o V 3 F i l e s · breach
••• emails
Database World ROC · breach
••• emails
B F R e p o V 3 F i l e s · breach
••• emails
+ 17 more leak sources locked
Leak volumes are locked
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