This record tracks a ransomware attack claimed by the
akira group against
High Grade Materials. 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.
-11days
t1 · Published
t2 · Disclosed
Business Category
Finance / Legal / Insurance
Disclosed / Notified
Apr 21, 2025
Attack Summary
High Grade Materials is a Michigan-based company specializing in
concrete and concrete-related products.
We are going to upload about 20 GB of corporate data. A lot of em
ployee information (DOB, passport number, address, phone and so o
n), detailed financial data (audits, payment details, reports, in
voices), contracts and agreements, death/birth certificates, NDAs
, etc.
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 highgradematerials.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
152+
found in Traditional breaches
38+
found in Ransomware leaks
VerificationsIO_BF.7z.011
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••• emails
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••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
limeleads_breach.7z
TheUnderground - Reborn · breach
••• emails
linkedIN_2.7z.001
Database World ROC · breach
••• emails
Factual_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Colonial Surety Company
medusa · ransomware
••• emails
+ 17 more leak sources locked
Leak volumes are locked
Sign in to reveal how many records each source exposed and the remaining 20 sources.
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.