DisclosureLens
GLOBALMalwareHealthcareHealthcareRansomwareMeowRansom DemandedActor NamedData Leak ThreatenedData PublishedHigh

MEMORIAL SLOAN-KETTERING CANCER CENTER

bd_f86d359e2600fccc · schema v1 · pii pii-v1

Severity

High

Discovered

—

Filed

Dec 12, 2023

To disclose

—

Affected

Not disclosed

Linked

2 filings

Confidence

50%
Full breach record for MEMORIAL SLOAN-KETTERING CANCER CENTER →7 incidents on file

Threat-actor claim — not a regulatory filing

This row is a claim by the ransomware group Meow on its public extortion blog. It has not been validated by the victim or any regulator. Treat attribution and counts as the threat actor's assertion until a regulatory filing or victim disclosure corroborates them.

Group activity: HealthcareDiscovered: 2023-12-12
View aggregator listing on ransomware.liveView merged incident timeline

Source: Ransomware.live

Post text · scraped from the leak site

PREVIEW

Incident timeline — mostly unverified

? — ?

Breach window unknown

Dec 12, 2023

Claim posted

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

Claim → filing

—

Compliance clock

Not assessable

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Filing propagation · 2 filings

View merged incident ↗
Leak SiteDec 12 · first · this page
HHS OCR+196d

Pattern: first filing Dec 12, last Jun 25 (NY) — a 196-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claimThis record

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source ceiling

  • actor name
  • victim claim
  • ransom/leak status
  • discovery date
  • materiality
  • notification
  • affected count
  • confirmed data types
  • compliance clock

The ✕ fields stay blank until a regulatory filing or victim disclosure lands.

About this groupFirst seen 2023-09-04

meow

According to ransomware.live, Meow emerged in 2022 (resurfacing aggressively in 2024), initially operating as a RaaS using the Conti v2 codebase before transitioning to a data-extortion-only model — selling stolen data rather than encrypting files — with a heavy focus on US healthcare and medical research organizations.

145 victims claimed globally145 tracked hereFull profile →