HackingProfessional ServicesProfessional ServicesStolen CredentialsCapture Stored DataSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumActive

Postlethwaite & Netterville

bd_de2f824183e613b9 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 23, 2021

Filed

Aug 11, 2021

To disclose

20 weeks

Affected

1state residents only

Confidence

66%

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

Postlethwaite & Netterville reported a data event affecting 1 New Hampshire resident. Suspicious activity was detected on March 23, 2021, regarding data on an Accellion File Transfer Appliance accessible since Jan 21, 2021. PII including names and SSNs was taken. The firm migrated data off the appliance, contacted law enforcement, and offered 1 year of credit monitoring.

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Incident timeline

undetected · 61 days

discovery → filing · 20 weeks / 141 days

Jan 21, 2021

Begins

Mar 23, 2021

Discovered

Aug 11, 2021

Filed

vs. sector median

+6 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: Mullen Coughlin LLC
norm: mullen coughlin

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

Discovered: Mar 23, 2021
Breach occurred: Jan 21, 2021
Undetected for: 61 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 5, 2021
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government ID
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
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 written notice to affected individuals
Provided access to credit monitoring services for one year through IDX
Changes made: Migrated all data off of the vulnerable Accellion file transfer appliance
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 weeks(141 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-20210811.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 11, 2021
Raw hash: a91dfb265c1698e6df2b5df38e8115aacaf9288083647afe585980f1c967e837

Reporting entityMullen Coughlin LLC

Victim entityPostlethwaite & Netterville

Incidentdiscovered Mar 23, 2021

Stated responseMigrated all data off of the Accellion File Transfer Appliance

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov