HackingHealthcareFinancial ServicesHealthcareStolen CredentialsData ExfiltratedCustomer Data InvolvedMulti-Stage ChainIdentity (basic)Health (basic)CredentialsLowActive

Premera Blue Cross

bd_0852d7157ec904da · schema v1 · pii pii-v1

Severity

Low

Discovered

May 17, 2022

Filed

Jun 10, 2022

To disclose

24 days

Affected

1state residents only

Confidence

64%

Full breach record for Premera Blue Cross →7 incidents on file

Premera Blue Cross notified Montana residents of a credential stuffing attack on its pharmacy vendor, Express Scripts, affecting mobile app users. The incident, discovered May 17, 2022, potentially exposed names, prescription history, and credentials. Premera reset accounts and offered credit monitoring.

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Incident timeline

undetected · 17 days

discovery → filing · 24 days

Apr 30, 2022

Begins

May 17, 2022

Discovered

Jun 10, 2022

Filed

vs. sector median

9 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1,314 affectedView incident

Name: Premera Blue Cross
norm: premera blue cross
Domain: premera.com

Name: Premera Blue Cross
norm: premera blue cross
Domain: premera.com
Industry: HealthcarellmFinancial Servicesllm

Discovered: May 17, 2022
Breach occurred: Apr 30, 2022
Undetected for: 17 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 25, 2022
Affected individuals: 1state-resident count only
Data types: Identity (basic)Health (basic)Credentials
Attack vector: Phishing
MITRE ATT&CK: T1110 Brute ForceT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified the Federal Bureau of Investigation (FBI)
Third party: via Express Scripts
Initial access: valid_credentials

During the incident: Notified the Federal Bureau of Investigation (FBI)
Engaged a third-party incident response firm
Locked all potentially compromised accounts
Forced a password reset
Temporarily shut down the mobile app for further investigation
Implemented additional monitoring, blocking, and preventive controls
Reset member login accounts on www.premera.com
Changes made: Expedited implementation of mandatory multifactor authentication capabilities on the Express Scripts mobile app
Implemented a reputable third-party security solution that prevents large-scale fraud with account takeover protection
Blocked device characteristics at the network infrastructure level
Deployed a new network-based technology to monitor and mitigate anomalous or potentially suspicious activity
Updated internal threshold monitoring tools to limit login attempts per IP address
Increased monitoring of the dark web for chatter related to the sale of Express Scripts credentials
Provided 12-month free credit monitoring service through Equifax Complete Premier
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 24 days(24 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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-737.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 10, 2022
Raw hash: 528ce963959ad06969a88584dbd042556ec43338124dbe6c96a11f44caf4b7aa

Reporting entityPremera Blue Cross

Victim entityPremera Blue Cross

Incidentdiscovered May 17, 2022

Stated responseNotified the Federal Bureau of Investigation (FBI)

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov