MalwareHealthcareData ExfiltratedCustomer Data InvolvedN-DayPHIHealth (basic)Identity (basic)Government IDMediumContained

Crozer-Keystone Health System (Delaware County, PA)

bd_e3b090b7ca2e27de · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 14, 2020

Filed

Sep 1, 2020

To disclose

11 weeks

Affected

Not disclosed

Linked

3 filings

Confidence

66%

Full breach record for Crozer-Keystone Health System (Delaware County, PA) →

Crozer-Keystone Health System notified Delaware residents of a June 14, 2020 ransomware incident affecting a small portion of hospital data. The attack involved a known ransomware group and resulted in the exfiltration of patient health and personal information, including names, DOBs, SSNs, and lab results. The malware was isolated, systems restored, and all stolen data recovered. The organization engaged forensic investigators, enhanced security controls, and offered one year of free credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >90d11 weeks discovery → filing

Incident timeline

discovery → filing · 11 weeks / 79 days

Jun 14, 2020

Discovered

Sep 1, 2020

Filed

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siterevilbd_345d0588be0850f82020-06-01 · +92dCandidate

Regulatory filings (1) · sorted by filing gap

Montana State AGbd_b9f11fdc5991ca6b2020-09-30 · +29dVerified by operator

Name: Crozer-Keystone Health System (Delaware County, PA)
norm: crozer keystone health system delaware county

Name: Crozer-Keystone Health System (Delaware County, PA)
norm: crozer keystone health system delaware county

Discovered: Jun 14, 2020
Materiality determined: —
Notification sent: Sep 1, 2020
Affected individuals: Not disclosed
Data types: PHIHealth (basic)Government IDIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial

During the incident: Engaged external security professionals to assist in conducting a full investigation
Isolated the malware
Repaired and brought systems back to full functionality
Recovered all accessed data
Enhanced security detection and response processes
Implemented additional safeguards to enhance access controls
Offered free credit monitoring and identity recovery services for one year
Changes made: Enhanced security detection and response processes
Implemented additional safeguards to enhance access controls to systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(79 days from discovery to filing)
Compliance flags: Leak >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Delaware State AGSep 1 · first · this page

Montana State AG+29d

Pattern: first filing Sep 1 (DE), last Sep 30 (MT) — a 29-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

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

Press / market report

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

State AG / regulator filingThis record

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

SEC 8-K / victim statement

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

Source URL: https://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2020/11/Crozer-Master-Notice-to-Customers.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 1, 2020
Raw hash: 5950eeb79210e204e541810204830dae4f6592138924ceefa88e2f69ee0464db

Linked disclosures

Ransomware claims (1)

Regulatory filings (1) · sorted by filing gap

Reporting entityCrozer-Keystone Health System (Delaware County, PA)

Victim entityCrozer-Keystone Health System (Delaware County, PA)

Incidentdiscovered Jun 14, 2020

Stated responseEngaged external security professionals to assist in conducting a full investigation

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenanceattorneygeneral.delaware.gov