This record tracks a ransomware attack claimed by the
BrainCipher group against
prosomnus.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.
0days open
t1 · Published
t2 · Pending
Indexed by Breach House
October 21, 2026
Leak Status
leaked
checked 2026-10-21
Disclosed / Notified
Not disclosed yet
Attack Summary
prosomnus.com operates within the IT sector and is headquartered in the United States. The entity is cataloged within this threat-intelligence index as a ransomware victim linked to the BrainCipher threat actor. This listing type indicates an association with a cyber threat campaign targeting information technology infrastructure. No specific incident details, such as stolen data categories, record counts, ransom amounts, or confirmed breach specifics, are provided in this entry to maintain factual neutrality and avoid speculation. The entry serves to index the entity's relationship to the identified threat actor within the ransomware victim category.
Leak Screenshots
1 CAPTURED
Captured directly from the operator's leak site by our collector, last checked 2026-10-21. Verdict evidence: [H5] Total size - 100GB, 78,000 files. Contents: Patients' PHI; Kaiser Permanente Patient-Partner Tracking Sheet; Non-public FDA regulatory files; .bak; .pst.; If you think you are here by mistake, pl
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Dark Web Exposure
Findings for prosomnus.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
226
found in Traditional breaches
72
found in Ransomware leaks
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TheUnderground - Reborn · breach
••• emails
pureincubation-com.7z.001
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••• emails
Legend Networking & Telecom
play · ransomware
••• emails
Questel SAS
shinyhunters · ransomware
••• emails
MGM_Grand_Hotels RUTOR.7z
TheUnderground - Reborn · breach
••• emails
shinyhunters · ransomware
••• emails
Database World ROC · breach
••• emails
Database World ROC · breach
••• emails
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