This record tracks a ransomware attack claimed by the
sinobi group against
White Birch Paper. 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.
-33days
t1 · Published
t2 · Disclosed
Business Category
Communication / Marketing
Published
August 09, 2025
Disclosed / Notified
Jul 08, 2025
Attack Summary
White Birch Paper produces high-quality paper and paperboard products. Through continuous investment in safety, sustainability and operations, they are able to thrive as a reliable partner that works with a sense of urgency to meet our customers’ needs and enable their success. It manufacture newsprint, recycled kraft paper, high-bright, paperboard and other specialty paper products at their four paper mills in Canada and the United States, where they serve customers throughout North America and across the world.
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 whitebirchpaper.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
668
found in Traditional breaches
31
found in Ransomware leaks
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
linkedIN_2.7z.001
Database World ROC · breach
••• emails
contacts_20.csv
Database World ROC · breach
••• emails
WASHINGTONPOST.COM
clop · ransomware
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Marcus & Millichap, Inc.
shinyhunters · breach
••• emails
+ 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.