Social EngineeringHealthcareHealthcarePhishingStolen CredentialsCustomer Data InvolvedData ExfiltratedPHIHealth (basic)Identity (basic)Government IDHighContained

Highmark Inc

bd_942a588b7d88d2c3 · schema v1 · pii pii-v1

Severity

High

Discovered

Dec 15, 2022

Filed

Feb 6, 2023

To disclose

8 weeks

Affected

1,980state residents only

Linked

10 filings

Confidence

69%

Full breach record for Highmark Inc →8 incidents on file

Highmark Health reported a phishing incident where an employee's email account was compromised between Dec 13-15, 2022. Discovered Dec 15, 2022. Exposed PHI, names, SSNs, and member data for 1,980 Washington residents. Notices sent Feb 13, 2023, offering 24 months of credit monitoring.

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Washington clock⏱ WA AG >30d8 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 2 days

discovery → filing · 8 weeks / 53 days

Dec 13, 2022

Begins

Dec 15, 2022

Discovered

Feb 6, 2023

Filed

vs. sector median

5 wks faster

This filing is one of 10 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (9) · sorted by filing gap

South Carolina State AGbd_f08d1e5c8ae3fa0f2023-02-07 · +1dVerified
California State AGbd_e3ddb304e00287ca2023-02-03 · +3dCandidate
Maine State AGbd_f75581b2eb9ebe572023-02-03 · +3dVerified
HHS OCRbd_67a2105beb6464002023-02-10 · +4dVerified

Show 5 more filings ↓up to 140d gap

HHS OCRbd_979c36a1443ad8f12023-02-10 · +4dVerified
Indiana State AGbd_b1db1c0f4716a2872023-02-10 · +4dVerified
Delaware State AGbd_b2b69efe74984e652023-02-10 · +4dVerified
Delaware State AGbd_9b2ceab0938674db2023-02-15 · +9dVerified
New Hampshire State AGbd_445a421e449e6ca32023-06-26 · +140dVerified

Name: Highmark Inc
norm: highmark
Domain: highmark.com

Name: Highmark Inc
norm: highmark
Domain: highmark.com
Industry: Healthcarellm

Discovered: Dec 15, 2022
Breach occurred: Dec 13, 2022 – Dec 15, 2022
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 13, 2023
Affected individuals: 1,980state-resident count only
Data types: PHIHealth (basic)Identity (basic)Government ID
Data elements: NameHealth insurance IDMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: External
Initial access: phishing_link

During the incident: Engaged an external forensics firm to analyze the contents to the email box and identify impacted individuals
Shut down the mailbox
Implemented network blocking
Reset passwords
Changes made: Pursuing additional phishing prevention, detection, and response solutions
Employees will receive additional cyber security training and education
Enhance email security controls
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(53 days from discovery to filing)
Compliance flags: WA AG >30d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 10 filings · 8 states

View merged incident ↗

California State AGFeb 3 · first

Maine State AGFeb 3 · first

Washington State AG+3d · this page

South Carolina State AG+4d

HHS OCR+7d

Indiana State AG+7d

Delaware State AG+7d

Delaware State AG+12d

New Hampshire State AG+143d

Pattern: first filing Feb 3 (CA), last Jun 26 (NH) — a 143-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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA19731.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 6, 2023
Raw hash: 2cf0a6956f4b368cfe0a746a2a1e190a8b3dc08103615075b2e230cbbcee5a76

Linked disclosures

Regulatory filings (9) · sorted by filing gap

Reporting entityHighmark Inc

Victim entityHighmark Inc

Incidentdiscovered Dec 15, 2022

Stated responseEngaged an external forensics firm to analyze the contents to the email box and identify impacted individuals

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com