HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedIdentity (basic)PIILowContained

EISAI INC.

bd_e87b4887774c3dad · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 3, 2023

Filed

Oct 2, 2023

To disclose

17 weeks

Affected

6state residents only

Linked

6 filings

Confidence

66%

Full breach record for EISAI INC. →5 incidents on file

Eisai Inc. notified Montana residents of unauthorized network access between May 22 and June 3, 2023. The incident involved the exfiltration of names and consolidated data elements. Eisai engaged a cybersecurity firm, notified law enforcement, and offered credit monitoring services to affected individuals.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 12 days

discovery → filing · 17 weeks / 121 days

May 22, 2023

Begins

Jun 3, 2023

Discovered

Oct 2, 2023

Filed

vs. sector median

+5 wks slower

This filing is one of 6 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Indiana State AGbd_205406df7a4d5b0e2023-10-02Verified
Maine State AGbd_278d9749e3b058b52023-10-02Candidate
Vermont State AGbd_8312ac8b94d224692023-10-02Verified
New Hampshire State AGbd_8ac324a55291e8952023-10-02Verified

Show 1 more filing ↓

Massachusetts State AGbd_cec3ca64f45dce4c2023-10-02Verified

Name: EISAI INC.
norm: eisai
Domain: eisai.com

Name: EISAI INC.
norm: eisai
Domain: eisai.com
Industry: Healthcarellm

Discovered: Jun 3, 2023
Breach occurred: May 22, 2023 – Jun 3, 2023
Undetected for: 12 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 6state-resident count only
Data types: Identity (basic)PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1041 Exfiltration Over C2 ChannelT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified law enforcement

During the incident: Implemented our incident response plan
Took steps to contain the activity
Launched an investigation
Engaged a cybersecurity firm
Notified law enforcement
Changes made: Implement additional security measures
Provide training to employees concerning data security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 weeks(121 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

Indiana State AGOct 2 · first

Maine State AGOct 2 · first

Vermont State AGOct 2 · first

New Hampshire State AGOct 2 · first

Massachusetts State AGOct 2 · first

Montana State AGOct 2 · first · this page

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-742.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 2, 2023
Raw hash: 230dccb2f54ec6b10af1e3aa34f96180c4a6d2bd89b7439430c07cad7e5f1198

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityEISAI INC.

Victim entityEISAI INC.

Incidentdiscovered Jun 3, 2023

Stated responseImplemented our incident response plan

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov