Social EngineeringFinancial ServicesFinancePhishingStolen CredentialsCustomer Data InvolvedPIIIdentity (basic)LowContained

The First National Bank of Sonora

bd_6df72648a4ce7476 · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 10, 2020

Filed

Nov 20, 2020

To disclose

15 weeks

Affected

7state residents only

Linked

2 filings

Confidence

65%

Full breach record for The First National Bank of Sonora →

First Sonora Bank notified customers that an unauthorized third party accessed an employee's email account between June 1 and August 10, 2020, exposing personal information. The bank secured the account, engaged forensic investigators, and offered one year of Experian IdentityWorks credit monitoring.

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Incident timeline

undetected · 70 days

discovery → filing · 15 weeks / 102 days

Jun 1, 2020

Begins

Aug 10, 2020

Discovered

Nov 20, 2020

Filed

vs. sector median

+6 wks slower

This filing is one of 2 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

New Hampshire State AGbd_e0858e666c271f432020-11-23 · +3dVerified

Name: The First National Bank of Sonora
norm: the first national bank of sonora

Name: The First National Bank of Sonora
norm: the first national bank of sonora
Industry: Financial Servicesllm

Discovered: Aug 10, 2020
Breach occurred: Jun 1, 2020 – Aug 10, 2020
Undetected for: 70 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 7state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: External
Initial access: phishing_link

During the incident: Secured the email account to prevent further access
Engaged a forensic security firm to investigate and confirm the security of our email and computer systems
Changes made: Offering a complimentary one-year membership of Experian IdentityWorks SM Credit 3B
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 weeks(102 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Montana State AGNov 20 · first · this page

New Hampshire State AG+3d

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/first-sonoSamp.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 20, 2020
Raw hash: bb301cd6db3eb7a98801396923a23c75f603a4d24beea27ffc8b50a64469fc4a

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityThe First National Bank of Sonora

Victim entityThe First National Bank of Sonora

Incidentdiscovered Aug 10, 2020

Stated responseSecured the email account to prevent further access

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov