HackingProfessional ServicesProfessional ServicesStolen CredentialsData MishandlingSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDHealth (basic)AuthenticationMediumActive

Postlethwaite & Netterville

bd_960f1056c3a5a1dc · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 1, 2021

Filed

Nov 9, 2021

To disclose

36 weeks

Affected

1state residents only

Confidence

66%

Full breach record for Postlethwaite & Netterville →4 incidents on file

Postlethwaite & Netterville filed a supplemental notice with the NH AG regarding a data incident involving Accellion file transfers. Unauthorized access occurred on Jan 21, 2021. One NH resident affected with PII, SSN, PHI, and signatures. Notification sent Oct 7, 2021. Credit monitoring offered.

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Incident timeline

undetected · 39 days

discovery → filing · 36 weeks / 253 days

Jan 21, 2021

Begins

Mar 1, 2021

Discovered

Nov 9, 2021

Filed

vs. sector median

+22 wks slower

Part of Accellion supply-chain incident (2021) — a supply-chain cascade affecting multiple organizations.View cascade →

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

Name: Postlethwaite & Netterville
norm: postlethwaite netterville
Industry: Professional Services

Name: Postlethwaite & Netterville
norm: postlethwaite netterville
Industry: Professional Services
Industry: Professional Servicesllm

Discovered: Mar 1, 2021
Breach occurred: Jan 21, 2021
Undetected for: 39 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 7, 2021
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDHealth (basic)Authentication
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney General Consumer Protection Bureau
Third party: via Accellion, Inc.
Initial access: supply_chain

During the incident: Migrated all data off of the Accellion File Transfer Appliance
Assessed the security of Postlethwaite & Netterville systems
Contacted law enforcement
Provided access to credit monitoring services for one year through IDX
Changes made: Provided impacted individuals with guidance on how to better protect against identity theft and fraud
Advised individuals to report any suspected incidents of identity theft or fraud to their credit card company and/or bank
Provided information on how to place a fraud alert and security freeze on one's credit file
Provided information on protecting against tax fraud
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 36 weeks(253 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/postlethwaite-netterville-20211109.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 9, 2021
Raw hash: a98681d9a506973f1c71d85334cfb317ff572423f8fd0f86060a56bfe5538f74

Reporting entityPostlethwaite & Netterville

Victim entityPostlethwaite & Netterville

Incidentdiscovered Mar 1, 2021

Stated responseMigrated all data off of the Accellion File Transfer Appliance

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov