AccidentalFinancial ServicesFinanceMisdeliveryCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDHighResolved

The Bank of Tokyo-Mitsubishi UFJ Ltd.

bd_cc1386fdbe315f15 · schema v1 · pii pii-v1

Severity

High

Discovered

Aug 6, 2013

Filed

Sep 11, 2013

To disclose

5 weeks

Affected · nationwide

1,2462 in this filing

Confidence

66%

Full breach record for The Bank of Tokyo-Mitsubishi UFJ Ltd. →

Aon Hewitt, a vendor for The Bank of Tokyo-Mitsubishi UFJ Ltd., inadvertently emailed a file containing names and SSNs of 1,246 Bank of Tokyo employees to two individuals in another client's HR department on August 2, 2013. The error was detected on August 6, 2013. Notifications were mailed on September 3, 2013, offering one year of credit monitoring. 2 New Hampshire residents were affected.

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Incident timeline

undetected · 4 days

discovery → filing · 5 weeks / 36 days

Aug 2, 2013

Begins

Aug 6, 2013

Discovered

Sep 11, 2013

Filed

vs. sector median

3 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1,246 affectedView incident

Name: Aon
norm: aon
Domain: aon.com

Name: The Bank of Tokyo-Mitsubishi UFJ Ltd.
norm: the bank of tokyo mitsubishi ufj
Industry: Financial Servicesllm

Discovered: Aug 6, 2013
Breach occurred: Aug 2, 2013
Undetected for: 4 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 3, 2013
Affected individuals: 1,246state + nationwide
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: Internal
Regulator citations: Notified State of New Hampshire Office of the Attorney General

During the incident: Formal performance plan measures were taken to discipline the colleague who made the error
Implemented additional remediation steps to avoid such errors in the future
Notified all affected individuals via written letter
Procured credit monitoring services for the affected individuals
Changes made: Implemented additional remediation steps to avoid such errors in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(36 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://mm.nh.gov/files/uploads/doj/remote-docs/bank-tokyo-mitsubishi-20130911.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 11, 2013
Raw hash: c93def505035ce7fea11d87777c7aa26e3fa156f4a4c17a87dd30dd1256d1038

Reporting entityAon

Victim entityThe Bank of Tokyo-Mitsubishi UFJ Ltd.

Incidentdiscovered Aug 6, 2013

Stated responseFormal performance plan measures were taken to discipline the colleague who made the error

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov