HackingHealthcareGovernment IDIdentity (basic)MediumContained

EISAI INC.

bd_8ac324a55291e895 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 3, 2023

Filed

Oct 2, 2023

To disclose

17 weeks

Affected

87state residents only

Linked

6 filings

Confidence

66%

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

Eisai Inc. notified the New Hampshire Attorney General of a cybersecurity incident involving unauthorized access to network files between May 22 and June 3, 2023. The breach affected 87 New Hampshire residents, whose information (including SSNs and credit card numbers) was accessed. Eisai engaged a cybersecurity firm, notified law enforcement, and began mailing notification letters on October 2, 2023, offering identity protection services.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d17 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 · 12 days

discovery → filing · 17 weeks / 121 days

May 22, 2023

Begins

Jun 3, 2023

Discovered

Oct 2, 2023

Filed

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

A leak claim by atomsilo about this victim predates this filing by 650 days.View originating leak claim

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
Massachusetts State AGbd_cec3ca64f45dce4c2023-10-02Verified

Show 1 more filing ↓

Montana State AGbd_e87b4887774c3dad2023-10-02Verified

Name: Edward J. McAndrew
norm: edward j mcandrew

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

Discovered: Jun 3, 2023
Breach occurred: May 22, 2023 – Jun 3, 2023
Undetected for: 12 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 2, 2023
Affected individuals: 87state-resident count only
Data types: Government IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Implemented its incident response plan
Took steps to contain the activity
Launched an investigation
A cybersecurity firm that has assisted other companies in similar situations was engaged
Law enforcement was also notified
Changes made: Implementing additional security measures to enhance the security of its environment
Providing 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: Leak >180d
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 · 6 filings · 6 states

View merged incident ↗

Indiana State AGOct 2 · first

Maine State AGOct 2 · first

Vermont State AGOct 2 · first

Massachusetts State AGOct 2 · first

Montana State AGOct 2 · first

New Hampshire 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://mm.nh.gov/files/uploads/doj/remote-docs/eisai-20231002.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: e3cd1dee4d3064b92d576f5677d0f461b122c22f83f8d7754eac4c8ed8f36862

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityEdward J. McAndrew

Victim entityEISAI INC.

Incidentdiscovered Jun 3, 2023

Stated responseImplemented its incident response plan

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov