HackingProfessional ServicesProfessional ServicesStolen CredentialsData ExfiltratedSupply Chain (3P Vendor)PIIIdentity (basic)LowActive

Postlethwaite & Netterville APAC

bd_6fe5ce08759000b2 · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 1, 2021

Filed

Aug 5, 2021

To disclose

22 weeks

Affected

1state residents only

Confidence

66%

Full breach record for Postlethwaite & Netterville APAC →7 incidents on file

Postlethwaite & Netterville APAC notified Montana residents of a data breach involving unauthorized access to data via a vulnerable Accellion file transfer appliance. Access occurred on Jan 21, 2021. PII including names and possibly SSNs was potentially accessed. P&N migrated data, contacted law enforcement, and offered IDX identity protection services.

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Incident timeline

undetected · 39 days

discovery → filing · 22 weeks / 157 days

Jan 21, 2021

Begins

Mar 1, 2021

Discovered

Aug 5, 2021

Filed

vs. sector median

+5 wks slower

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

Name: Postlethwaite & Netterville APAC
norm: postlethwaite netterville apac

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

Discovered: Mar 1, 2021
Breach occurred: Jan 21, 2021
Undetected for: 39 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 5, 2021
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: contacted law enforcement
Initial access: supply_chain

During the incident: Launched an in-depth investigation
Migrated all data off of the vulnerable Accellion file transfer appliance
Contacted law enforcement
Offering identity theft protection services through IDX
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 22 weeks(157 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://dojmt.gov/wp-content/uploads/OCP/notificationLetter-18.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 5, 2021
Raw hash: 9a3693e3f31c818d4832b748ac7987398a5d24863813248b73d01d4fc03bc29a

Reporting entityPostlethwaite & Netterville APAC

Victim entityPostlethwaite & Netterville APAC

Incidentdiscovered Mar 1, 2021

Stated responseLaunched an in-depth investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov