HackingHealthcareHealthcareData ExfiltratedTargetedIdentity (basic)Government IDHealth (basic)PHIMediumContained

OSF HEALTHCARE SYSTEM

bd_642aeb97e779372a · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 23, 2021

Filed

Oct 1, 2021

To disclose

23 weeks

Affected

2state residents only

Linked

7 records

Confidence

65%

Full breach record for OSF HEALTHCARE SYSTEM →10 incidents on file

OSF HealthCare System notified patients of a security incident where unauthorized access occurred between March 7 and April 23, 2021. The breach affected patient data including names, SSNs, driver's licenses, and PHI at two Illinois medical centers. OSF engaged forensic investigators, notified law enforcement, and offered 12 months of Experian IdentityWorks.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >90d23 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 47 days

discovery → filing · 23 weeks / 161 days

Mar 7, 2021

Begins

Apr 23, 2021

Discovered

Oct 1, 2021

Filed

vs. sector median

+14 wks slower

This filing is one of 7 records about the same incident.View merged incident

A leak claim by xinglocker about this victim was first seen 136 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitexinglockerbd_f8ace411af1e1abf2021-05-18 · +136dVerified by operator

Regulatory filings (4) · sorted by filing gap

Massachusetts State AGbd_b288deb4577e5ece2021-10-01Verified
HHS OCRbd_bf20565c237987762021-10-01Verified by operator
Illinois State AGbd_14299358f0ba63fe2021-01-01 · +273dVerified by operator
Illinois State AGbd_c91f7fe398e530012021-01-01 · +273dVerified by operator

Enforcement records (1)

HHS OCR enforcementbd_7fbc6210e9c1f4d52026-07-29 · +1762dVerified by operator

Name: OSF HEALTHCARE SYSTEM
norm: osf healthcare system

Name: OSF HEALTHCARE SYSTEM
norm: osf healthcare system
Industry: Healthcarellm

Discovered: Apr 23, 2021
Breach occurred: Mar 7, 2021 – Apr 23, 2021
Undetected for: 47 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 24, 2021
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDHealth (basic)PHI
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Regulator citations: notified law enforcement

During the incident: Took steps to secure our systems
Launched an investigation with the assistance of a third-party forensic investigator
Notified law enforcement
Changes made: Implemented additional safeguards and technical security measures to further protect and monitor our systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 weeks(161 days from discovery to filing)
Compliance flags: Leak >90d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 3 states

View merged incident ↗

Illinois State AGJan 1 · first

Massachusetts State AG+273d

HHS OCR+273d

Montana State AG+273d · this page

Pattern: first filing Jan 1 (IL), last Oct 1 (MT) — a 273-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://dojmt.gov/wp-content/uploads/OCP/consumer-notification-letter-18.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 1, 2021
Raw hash: b0fdd02b0d1d5ecddd5e4b5cd8c90635b14e1e75b51f259b4f667c7219b6e5f8

Linked disclosures

Ransomware claims (1)

Regulatory filings (4) · sorted by filing gap

Enforcement records (1)

Reporting entityOSF HEALTHCARE SYSTEM

Victim entityOSF HEALTHCARE SYSTEM

Incidentdiscovered Apr 23, 2021

Stated responseTook steps to secure our systems

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenancedojmt.gov