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McKesson Corporation

shinyhunters

This record tracks a ransomware attack claimed by the shinyhunters group against McKesson Corporation. 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.

7days open
t1 · Published t2 · Pending
Aug 28, 2026Not disclosed yet
Country
United States
Business Category
Healthcare / Pharma
Employees
+1000
Discovered
2026-08-28
Published
August 28, 2026
Leak Status
leaked
checked 2026-09-04
Disclosed / Notified
Not disclosed yet
Victim ID
jWFYcM9uVRSh

Attack Summary

Hundreds of millions of records/rows of data was compromised containing very sensitive information spanning from PII to PHI. We urge you to reach out. Read our emails. We will provide a substanial discount. Failure to engage with us will result in the full publication of data taken from you and we very much intend to carry that out if you do not engage with us. This is a final warning to reach out by 1 Sep 2026 before we leak along with several annoying (digital) problems that'll come your way. Make the right decision, don't be the next headline. | Updated: 29 Aug 2026 | Warning: FINAL WARNING

Leak Screenshots

1 CAPTURED

Captured directly from the operator's leak site by our collector, last checked 2026-09-04. Verdict evidence: [M1] Download: McKesson Corporation (2024-06-27) (100%) (100%)

Leak site capture 2026-09-04
2026-09-04
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Dark Web Exposure

Cross-referenced against HaveIBeenRansom's dark-web index of ransomware leaks, breaches & infostealer logs.
0
found in Infostealer logs
0
found in Traditional breaches
0
found in Ransomware leaks
Emails exposed
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Internal
•••
External
•••
Distinct leaks
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•••••••••• · ••••••
••• emails
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•••••••••• · ••••••
••• emails
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•••••••••• · ••••••
••• emails
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•••••••••• · ••••••
••• emails
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View Group: shinyhunters

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Legal Disclaimer: This ransomware victim record reflects information published on the operator's leak site. Breach.house only records what the operators themselves publish in the open. We take screenshots of their public pages and keep the proof material they post there, so that a listing can be verified and its status tracked over time. We do not purchase data, we do not solicit or encourage its publication, we do not access any private system, and we do not alter anything we record. Nothing is offered for download here, and detailed content is not published on this page or anywhere else on the public site: access to it is restricted to vetted customers under contract, for incident response, due diligence and cyber-resilience work. Breach.house is not affiliated with, and does not act on behalf of, the operators who publish this material. If you represent an organisation or individual named here and want a record reviewed or removed, contact us and we will act on it.