HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedPIIIdentity (basic)LowContained

Cornerstone Defense, LLC

bd_ff6392a09acaac8f · schema v1 · pii pii-v1

Severity

Low

Discovered

Nov 28, 2023

Filed

Jan 29, 2024

To disclose

9 weeks

Affected

Not disclosed

Confidence

66%

Full breach record for Cornerstone Defense, LLC →

Cornerstone Defense, LLC notified the NH DOJ of an unauthorized access to an employee email account on Nov 28, 2023. No evidence of data compromise was found, but potential PII exposure exists. Remediation included 2FA, malware upgrades, and IDX identity protection services.

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Incident timeline

discovery → filing · 9 weeks / 62 days

Nov 28, 2023

Begins

Nov 28, 2023

Discovered

Jan 29, 2024

Filed

vs. sector median

10 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Cornerstone Defense, LLC
norm: cornerstone defense

Name: Cornerstone Defense, LLC
norm: cornerstone defense
Industry: Professional Servicesllm

Discovered: Nov 28, 2023
Breach occurred: Nov 28, 2023
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 18, 2024
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified New Hampshire Department of Justice
Initial access: valid_credentials

During the incident: Implemented enhanced security features to enable two step authentication
Upgraded its malware security software that includes anti-malware and web protection
Working with a cyber security company that will provide security services to prevent any future incidents
Offering identity theft protection services through IDX
Changes made: Implemented enhanced security features to enable two step authentication
Upgraded its malware security software that includes anti-malware and web protection
Working with a cyber security company that will provide security services to prevent any future incidents
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(62 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/cornerstone-defense-20240129.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 29, 2024
Raw hash: 4f6b506101fd7a08e89cf05b0c28aed2f46e09cca15d9fe4f530b46d055975f4

Reporting entityCornerstone Defense, LLC

Victim entityCornerstone Defense, LLC

Incidentdiscovered Nov 28, 2023

Stated responseImplemented enhanced security features to enable two step authentication

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov